diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 0000000..bd7e527
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1,62 @@
+# AGENTS.md
+
+## Scope
+These instructions apply to the entire repository unless a deeper `AGENTS.md` overrides them.
+
+## Repository Overview
+`PlantCtrl` is a mixed-discipline repository with embedded firmware, shared Rust crates, hardware design files, and a Hugo-based website.
+
+Top-level layout:
+- `Software/MainBoard/rust`: main embedded Rust firmware for the controller board (`plant-ctrl2`).
+- `Software/CAN_Sensor`: embedded Rust firmware for the CAN sensor / BMS board.
+- `Software/Shared/canapi`: shared Rust crate used by firmware projects.
+- `Hardware`: PCB, case, and related hardware design assets.
+- `DataSheets`: reference material; treat as source data, not generated output.
+- `website`: Hugo site based on the Blowfish theme.
+- `bin`: helper scripts and local tooling, if present.
+
+## Working Rules
+- Keep changes tightly scoped to the user request; this repo spans hardware, firmware, and website code.
+- Prefer fixing the underlying cause instead of applying cosmetic workarounds.
+- Preserve existing file structure and naming unless the user explicitly asks for restructuring.
+- Avoid mass formatting or opportunistic cleanup in KiCad files, lockfiles, generated assets, or vendored dependencies.
+- Do not edit dependency directories such as `website/themes` or `Software/MainBoard/rust/src_webpack/node_modules` unless the user explicitly asks for vendor changes.
+- When touching firmware code, keep resource usage and target constraints in mind; avoid unnecessary allocations or feature creep.
+
+## Firmware Guidance
+- Shared protocol or serialization changes must be checked for impact across both `Software/MainBoard/rust` and `Software/CAN_Sensor`.
+- Prefer small, explicit changes in embedded code paths; do not introduce heavyweight abstractions without a clear payoff.
+- Keep `no_std`/embedded assumptions intact unless the code clearly opts into something else.
+- Be careful with feature flags, target-specific dependencies, and boot/runtime configuration in Cargo manifests.
+
+## Hardware Guidance
+- Treat hardware directories as design artifacts, not generic text files.
+- Do not reorder, normalize, or bulk-edit PCB / CAD files unless the user specifically requests those changes.
+- If a software change depends on hardware assumptions, call that out clearly in the final handoff.
+
+## Website Guidance
+- The site in `website` uses Hugo with the Blowfish theme.
+- Prefer editing site content, config, or custom assets over modifying vendored theme internals.
+- Keep frontend changes consistent with the existing site structure unless the user asks for a redesign.
+
+## Validation
+Use the narrowest relevant check first.
+
+Useful commands:
+- `cargo check --manifest-path Software/Shared/canapi/Cargo.toml`
+- `cargo check --manifest-path Software/CAN_Sensor/Cargo.toml`
+- `cargo check --manifest-path Software/MainBoard/rust/Cargo.toml`
+- `npm run dev` from `website` for local Hugo development if the environment has the required tools installed.
+
+Validation notes:
+- Embedded firmware may require target-specific toolchains or hardware-adjacent tooling that is not always available.
+- If you cannot run a meaningful validation step, say so explicitly and describe the likely prerequisite.
+
+## File Hygiene
+- Read large files in chunks.
+- Prefer targeted searches (`rg`, or `find` if unavailable) over broad scans.
+- Do not commit build outputs, generated binaries, or local IDE metadata unless the user explicitly requests it.
+
+## Handoff Expectations
+- Summarize what changed, where it changed, and any validation performed.
+- Call out follow-up work when a change likely affects both firmware targets, hardware assumptions, or the website.
diff --git a/Hardware/Controller_Case/flap_v2.3mf b/Hardware/Controller_Case/flap_v2.3mf
new file mode 100644
index 0000000..7b1a3da
Binary files /dev/null and b/Hardware/Controller_Case/flap_v2.3mf differ
diff --git a/Software/CAN_Sensor/build.rs b/Software/CAN_Sensor/build.rs
index 77208e1..c08c92d 100644
--- a/Software/CAN_Sensor/build.rs
+++ b/Software/CAN_Sensor/build.rs
@@ -8,4 +8,15 @@ fn main() {
     std::fs::write(out_dir.join("memory.x"), include_bytes!("memory.x")).unwrap();
     println!("cargo:rustc-link-search={}", out_dir.display());
     println!("cargo:rerun-if-changed=memory.x");
+
+    // Embed firmware build timestamp as minutes since Unix epoch (4 bytes, big-endian).
+    // Dropping sub-minute precision keeps it in 4 bytes for many years.
+    let build_seconds = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .expect("System time before UNIX_EPOCH")
+        .as_secs();
+    let build_minutes = (build_seconds / 60) as u32;
+    let bytes = build_minutes.to_be_bytes();
+    std::fs::write(out_dir.join("build_minutes.bin"), bytes).unwrap();
+    println!("cargo:rerun-if-changed=build.rs");
 }
diff --git a/Software/CAN_Sensor/src/main.rs b/Software/CAN_Sensor/src/main.rs
index 537f141..25868da 100644
--- a/Software/CAN_Sensor/src/main.rs
+++ b/Software/CAN_Sensor/src/main.rs
@@ -3,7 +3,7 @@
 extern crate alloc;
 
 use crate::hal::peripherals::CAN1;
-use canapi::id::{plant_id, IDENTIFY_CMD_OFFSET, MOISTURE_DATA_OFFSET};
+use canapi::id::{plant_id, FIRMWARE_BUILD_OFFSET, IDENTIFY_CMD_OFFSET, MOISTURE_DATA_OFFSET};
 use canapi::SensorSlot;
 use ch32_hal::adc::{Adc, SampleTime, ADC_MAX};
 use ch32_hal::{pac};
@@ -47,6 +47,10 @@ static CAN_TX_CH: Channel<CriticalSectionRawMutex, CanFrame, 4> = Channel::new()
 
 static BEACON: AtomicBool = AtomicBool::new(false);
 
+/// Firmware build timestamp in minutes since Unix epoch, embedded at compile time.
+const FIRMWARE_BUILD_MINUTES: u32 =
+    u32::from_be_bytes(*include_bytes!(concat!(env!("OUT_DIR"), "/build_minutes.bin")));
+
 #[embassy_executor::main(entry = "qingke_rt::entry")]
 async fn main(spawner: Spawner) {
     ch32_hal::pac::AFIO.pcfr1().write(|w| w.set_can1_rm(2));
@@ -111,6 +115,7 @@ async fn main(spawner: Spawner) {
     }
     let moisture_id = plant_id(MOISTURE_DATA_OFFSET, slot, addr as u16);
     let identify_id = plant_id(IDENTIFY_CMD_OFFSET, slot, addr as u16);
+    let firmware_build_id = plant_id(FIRMWARE_BUILD_OFFSET, slot, addr as u16);
     let standard_identify_id = StandardId::new(identify_id).unwrap();
 
     //is any floating, or invalid addr (only 1-8 are valid)
@@ -269,8 +274,9 @@ async fn main(spawner: Spawner) {
        // filter.get(0).unwrap().set(Id::Standard(standard_identify_id), Default::default());
        // can.add_filter(filter);
         let standard_moisture_id = StandardId::new(moisture_id).unwrap();
+        let standard_firmware_build_id = StandardId::new(firmware_build_id).unwrap();
         spawner
-            .spawn(can_task(can,info, warn, standard_identify_id, standard_moisture_id))
+            .spawn(can_task(can, info, warn, standard_identify_id, standard_moisture_id, standard_firmware_build_id))
             .unwrap();
 
         // move Q output, LED, ADC and analog input into worker task
@@ -282,6 +288,8 @@ async fn main(spawner: Spawner) {
                 ain,
                 standard_moisture_id,
                 standard_identify_id,
+                standard_firmware_build_id,
+                slot,
             ))
             .unwrap();
     }
@@ -362,6 +370,7 @@ async fn can_task(
     warn: &'static mut Output<'static>,
     identify_id: StandardId,
     moisture_id: StandardId,
+    _firmware_build_id: StandardId,
 ) {
     // Non-blocking beacon blink timing.
     // We keep this inside the CAN task so it can't stall other tasks (like `worker`) with `await`s.
@@ -406,7 +415,7 @@ async fn can_task(
                     Timer::after_millis(100).await;
                 }
                 let mut msg: heapless::String<128> = heapless::String::new();
-                let _ = write!(&mut msg, "rx err {:?}", err);
+                let _ = write!(&mut msg, "rx err {:?} \r\n", err);
                 log(msg);
             }
         }
@@ -420,9 +429,25 @@ async fn can_task(
             }
         }
 
+
+
         while let Ok(mut frame) = CAN_TX_CH.try_receive() {
             match can.transmit(&mut frame) {
-                Ok(..) => {
+                Ok(_ok) => {
+                    let status = hal::pac::CAN1.errsr().read();
+
+                    // Check CAN error status register for bus-off condition
+                    if status.boff() || status.ewgf() || status.epvf() {
+                        let mut msg: heapless::String<128> = heapless::String::new();
+                        let _ = write!(&mut msg, "canbus status {} {} {} \r\n", status.boff(), status.ewgf(), status.epvf());
+                        log(msg);
+                        for _ in 0..2 {
+                            warn.set_high();
+                            Timer::after_millis(100).await;
+                            warn.set_low();
+                            Timer::after_millis(100).await;
+                        }
+                    }
                 }
                 Err(nb::Error::WouldBlock) => {
                     for _ in 0..2 {
@@ -432,7 +457,7 @@ async fn can_task(
                         Timer::after_millis(100).await;
                     }
                     let mut msg: heapless::String<128> = heapless::String::new();
-                    let _ = write!(&mut msg, "canbus out buffer full");
+                    let _ = write!(&mut msg, "canbus out buffer full  \r\n");
                     log(msg);
                 }
                 Err(nb::Error::Other(err)) => {
@@ -443,7 +468,7 @@ async fn can_task(
                         Timer::after_millis(100).await;
                     }
                     let mut msg: heapless::String<128> = heapless::String::new();
-                    let _ = write!(&mut msg, "tx err {:?}", err);
+                    let _ = write!(&mut msg, "tx err {:?}  \r\n", err);
                     log(msg);
                 }
             }
@@ -460,65 +485,108 @@ async fn worker(
     mut ain: hal::peripherals::PA1,
     moisture_id: StandardId,
     identify_id: StandardId,
+    firmware_build_id: StandardId,
+    slot: SensorSlot,
 ) {
     // 555 emulation state: Q initially Low
     let mut q_high = false;
     let low_th: u16 = (ADC_MAX as u16) / 3; // ~1/3 Vref
     let high_th: u16 = ((ADC_MAX as u32 * 2) / 3) as u16; // ~2/3 Vref
 
-    loop {
-        // Count rising edges of Q in a 100 ms window
-        let start = Instant::now();
-        let mut pulses: u32 = 0;
-        let mut last_q = q_high;
+    const AVG_WINDOWS: u32 = 4;
+    const YIELD_EVERY: u32 = 64;
+    let probe_duration = Duration::from_millis(100);
+    let measurement_time = probe_duration.as_millis() * AVG_WINDOWS as u64; // 400ms
+    let interleaving_gap = Duration::from_millis(50);
 
-        probe_gnd.set_as_output(Speed::Low);
-        probe_gnd.set_low();
-        let probe_duration = Duration::from_millis(100);
-        while Instant::now()
-            .checked_duration_since(start)
-            .unwrap_or(Duration::from_millis(0))
-            < probe_duration
-        {
-            // Sample the analog input (Threshold/Trigger on A1)
-            let val: u16 = adc.convert(&mut ain, SampleTime::CYCLES28_5);
+    // Interleaving timing to ensure A and B never overlap:
+    // - Sensor A: measures for 400ms
+    // - Gap: 50ms
+    // - Sensor B: measures for 400ms
+    // - Gap: 50ms
+    // Total cycle: 900ms, so each sensor measures every 900ms (~1.1 measurements/second)
+    //
+    // Timeline:
+    // 0-400ms:   A measures, B idle
+    // 400-450ms: both idle (gap)
+    // 450-850ms: B measures, A idle
+    // 850-900ms: both idle (gap)
+    // Then repeat from 0ms
 
-            // 555 core behavior:
-            // - If input <= 1/3 Vref => set Q high (trigger)
-            // - If input >= 2/3 Vref => set Q low (threshold)
-            // - Otherwise keep previous Q state (hysteresis)
-            if val <= low_th {
-                q_high = true;
-            } else if val >= high_th {
-                q_high = false;
-            }
-
-            // Drive output pin accordingly
-            if q_high {
-                q.set_high();
-            } else {
-                q.set_low();
-            }
-
-            // Count rising edges
-            if !last_q && q_high {
-                pulses = pulses.saturating_add(1);
-            }
-            last_q = q_high;
-
-            // Yield to allow USB and other tasks to run
-            yield_now().await;
+    // Initial offset: B waits for A's measurement time + one gap
+    match slot {
+        SensorSlot::A => {
+            // A sensors start measuring immediately
         }
-        probe_gnd.set_as_input(Pull::None);
+        SensorSlot::B => {
+            // B sensors wait for A to finish measuring + gap
+            Timer::after(Duration::from_millis(measurement_time + interleaving_gap.as_millis())).await;
+        }
+    }
 
-        let freq_hz: u32 = pulses * (1000 / probe_duration.as_millis()) as u32; // pulses per 0.1s => Hz
+    loop {
+        let mut total_pulses: u32 = 0;
+
+        for _window in 0..AVG_WINDOWS {
+            // Count rising edges of Q in a 100 ms window
+            let start = Instant::now();
+            let mut pulses: u32 = 0;
+            let mut last_q = q_high;
+            let mut iter_count: u32 = 0;
+
+            probe_gnd.set_as_output(Speed::Low);
+            probe_gnd.set_low();
+            while Instant::now()
+                .checked_duration_since(start)
+                .unwrap_or(Duration::from_millis(0))
+                < probe_duration
+            {
+                // Sample the analog input (Threshold/Trigger on A1)
+                let val: u16 = adc.convert(&mut ain, SampleTime::CYCLES28_5);
+
+                // 555 core behavior:
+                // - If input <= 1/3 Vref => set Q high (trigger)
+                // - If input >= 2/3 Vref => set Q low (threshold)
+                // - Otherwise keep previous Q state (hysteresis)
+                if val <= low_th {
+                    q_high = true;
+                } else if val >= high_th {
+                    q_high = false;
+                }
+
+                // Drive output pin accordingly
+                if q_high {
+                    q.set_high();
+                } else {
+                    q.set_low();
+                }
+
+                // Count rising edges
+                if !last_q && q_high {
+                    pulses = pulses.saturating_add(1);
+                }
+                last_q = q_high;
+
+                // Yield every YIELD_EVERY samples to keep USB alive without
+                // disrupting per-sample timing
+                iter_count += 1;
+                if iter_count % YIELD_EVERY == 0 {
+                    yield_now().await;
+                }
+            }
+            probe_gnd.set_as_input(Pull::None);
+            total_pulses = total_pulses.saturating_add(pulses);
+        }
+
+        let avg_pulses = total_pulses / AVG_WINDOWS;
+        let freq_hz: u32 = avg_pulses * (1000 / probe_duration.as_millis()) as u32;
 
         let mut msg: heapless::String<128> = heapless::String::new();
         let _ = write!(
             &mut msg,
-            "555 window={}ms pulses={} freq={} Hz (A1->Q on PB0) id={:?}\r\n",
-            probe_duration.as_millis(),
-            pulses,
+            "555 window={}ms avg_pulses={} freq={} Hz (A1->Q on PB0) id={:?}\r\n",
+            probe_duration.as_millis() * AVG_WINDOWS as u64,
+            avg_pulses,
             freq_hz,
             identify_id.as_raw()
         );
@@ -526,6 +594,17 @@ async fn worker(
 
         let moisture = CanFrame::new(moisture_id, &(freq_hz as u32).to_be_bytes()).unwrap();
         CAN_TX_CH.send(moisture).await;
+
+        // Send firmware build timestamp after each measurement so the controller
+        // always has up-to-date build info without requiring an identify request.
+        let firmware = CanFrame::new(firmware_build_id, &FIRMWARE_BUILD_MINUTES.to_be_bytes()).unwrap();
+        CAN_TX_CH.send(firmware).await;
+
+        // Wait for the other slot to measure, plus gaps to ensure no overlap
+        // After A finishes measuring: wait 50ms (gap) + 400ms (B measures) + 50ms (gap) = 500ms
+        // After B finishes measuring: wait 50ms (gap) + 400ms (A measures) + 50ms (gap) = 500ms
+        // This ensures the full 900ms cycle is maintained and A/B never overlap
+        Timer::after(Duration::from_millis(interleaving_gap.as_millis() + measurement_time + interleaving_gap.as_millis())).await;
     }
 }
 
diff --git a/Software/MainBoard/rust/.cargo/config.toml b/Software/MainBoard/rust/.cargo/config.toml
index 55152e5..efcb842 100644
--- a/Software/MainBoard/rust/.cargo/config.toml
+++ b/Software/MainBoard/rust/.cargo/config.toml
@@ -23,8 +23,6 @@ target = "riscv32imac-unknown-none-elf"
 CHRONO_TZ_TIMEZONE_FILTER = "UTC|America/New_York|America/Chicago|America/Los_Angeles|Europe/London|Europe/Berlin|Europe/Paris|Asia/Tokyo|Asia/Shanghai|Asia/Kolkata|Australia/Sydney|America/Sao_Paulo|Africa/Johannesburg|Asia/Dubai|Pacific/Auckland"
 CARGO_WORKSPACE_DIR = { value = "", relative = true }
 ESP_LOG = "info"
-PATH = { value = "../../../bin:/usr/bin:/usr/local/bin", force = true, relative = true }
-
 
 
 [unstable]
diff --git a/Software/MainBoard/rust/Cargo.lock b/Software/MainBoard/rust/Cargo.lock
new file mode 100644
index 0000000..4da74d5
--- /dev/null
+++ b/Software/MainBoard/rust/Cargo.lock
@@ -0,0 +1,2835 @@
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+version = "1.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "797f5e985cf584861a6b090d120743551e6ed2d65c39ee21907e372183e1d290"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.110",
+]
+
+[[package]]
+name = "unsafe-libyaml"
+version = "0.2.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "673aac59facbab8a9007c7f6108d11f63b603f7cabff99fabf650fea5c32b861"
+
+[[package]]
+name = "unty"
+version = "0.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6d49784317cd0d1ee7ec5c716dd598ec5b4483ea832a2dced265471cc0f690ae"
+
+[[package]]
+name = "valuable"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba73ea9cf16a25df0c8caa16c51acb937d5712a8429db78a3ee29d5dcacd3a65"
+
+[[package]]
+name = "vcell"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77439c1b53d2303b20d9459b1ade71a83c716e3f9c34f3228c00e6f185d6c002"
+
+[[package]]
+name = "vergen"
+version = "8.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2990d9ea5967266ea0ccf413a4aa5c42a93dbcfda9cb49a97de6931726b12566"
+dependencies = [
+ "anyhow",
+ "cfg-if",
+ "rustversion",
+ "time",
+]
+
+[[package]]
+name = "version_check"
+version = "0.9.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
+
+[[package]]
+name = "virtue"
+version = "0.0.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "051eb1abcf10076295e815102942cc58f9d5e3b4560e46e53c21e8ff6f3af7b1"
+
+[[package]]
+name = "void"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
+
+[[package]]
+name = "wasm-bindgen"
+version = "0.2.105"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da95793dfc411fbbd93f5be7715b0578ec61fe87cb1a42b12eb625caa5c5ea60"
+dependencies = [
+ "cfg-if",
+ "once_cell",
+ "rustversion",
+ "wasm-bindgen-macro",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.105"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "04264334509e04a7bf8690f2384ef5265f05143a4bff3889ab7a3269adab59c2"
+dependencies = [
+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.105"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "420bc339d9f322e562942d52e115d57e950d12d88983a14c79b86859ee6c7ebc"
+dependencies = [
+ "bumpalo",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.110",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.105"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "76f218a38c84bcb33c25ec7059b07847d465ce0e0a76b995e134a45adcb6af76"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "winapi-util"
+version = "0.1.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c2a7b1c03c876122aa43f3020e6c3c3ee5c05081c9a00739faf7503aeba10d22"
+dependencies = [
+ "windows-sys",
+]
+
+[[package]]
+name = "windows-core"
+version = "0.62.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8e83a14d34d0623b51dce9581199302a221863196a1dde71a7663a4c2be9deb"
+dependencies = [
+ "windows-implement",
+ "windows-interface",
+ "windows-link",
+ "windows-result",
+ "windows-strings",
+]
+
+[[package]]
+name = "windows-implement"
+version = "0.60.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "053e2e040ab57b9dc951b72c264860db7eb3b0200ba345b4e4c3b14f67855ddf"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.110",
+]
+
+[[package]]
+name = "windows-interface"
+version = "0.59.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f316c4a2570ba26bbec722032c4099d8c8bc095efccdc15688708623367e358"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.110",
+]
+
+[[package]]
+name = "windows-link"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
+
+[[package]]
+name = "windows-result"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7781fa89eaf60850ac3d2da7af8e5242a5ea78d1a11c49bf2910bb5a73853eb5"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "windows-strings"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7837d08f69c77cf6b07689544538e017c1bfcf57e34b4c0ff58e6c2cd3b37091"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "windows-sys"
+version = "0.61.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae137229bcbd6cdf0f7b80a31df61766145077ddf49416a728b02cb3921ff3fc"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "winnow"
+version = "0.7.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "21a0236b59786fed61e2a80582dd500fe61f18b5dca67a4a067d0bc9039339cf"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "xtensa-lx"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e012d667b0aa6d2592ace8ef145a98bff3e76cca7a644f4181ecd7a916ed289b"
+dependencies = [
+ "critical-section",
+]
+
+[[package]]
+name = "xtensa-lx-rt"
+version = "0.22.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "409a9b4629d429e995cde4dfbd9fe562ccae66f7624514e200733fc5d0ea8905"
+dependencies = [
+ "document-features",
+ "xtensa-lx",
+ "xtensa-lx-rt-proc-macros",
+]
+
+[[package]]
+name = "xtensa-lx-rt-proc-macros"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "96fb42cd29c42f8744c74276e9f5bee7b06685bbe5b88df891516d72cb320450"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.110",
+]
diff --git a/Software/MainBoard/rust/Cargo.toml b/Software/MainBoard/rust/Cargo.toml
index 4fce08b..bd3cbeb 100644
--- a/Software/MainBoard/rust/Cargo.toml
+++ b/Software/MainBoard/rust/Cargo.toml
@@ -46,57 +46,34 @@ canapi = { path = "../../Shared/canapi" }
 
 # Platform and ESP-specific runtime/boot/runtime utilities
 log = "0.4.28"
-esp-bootloader-esp-idf = { version = "0.4.0", features = ["esp32c6", "log-04"] }
-esp-hal = { version = "1.0.0", features = ["esp32c6", "log-04"] }
-esp-rtos = { version = "0.2.0", features = ["esp32c6", "embassy", "esp-radio"] }
-esp-backtrace = { version = "0.18.1", features = ["esp32c6", "panic-handler", "println", "colors", "custom-halt"] }
-esp-println = { version = "0.16.1", features = ["esp32c6", "log-04", "auto"] }
-esp-storage = { version = "0.8.1", features = ["esp32c6"] }
-esp-radio = { version = "0.17.0", features = ["esp32c6", "log-04", "smoltcp", "wifi", "unstable"] }
-esp-alloc = { version = "0.9.0", features = ["esp32c6", "internal-heap-stats"] }
+esp-bootloader-esp-idf = { version = "0.5.0", features = ["esp32c6", "log-04"] }
+esp-hal = { version = "1.1.0", features = ["esp32c6", "log-04"] }
+esp-rtos = { version = "0.3.0", features = ["esp32c6", "embassy", "esp-radio"] }
+esp-backtrace = { version = "0.19.0", features = ["esp32c6", "panic-handler", "println", "colors", "custom-halt"] }
+esp-println = { version = "0.17.0", features = ["esp32c6", "log-04", "auto"] }
+esp-storage = { version = "0.9.0", features = ["esp32c6"] }
+esp-radio = { version = "0.18.0", features = ["esp32c6", "log-04", "wifi", "unstable"] }
+esp-alloc = { version = "0.10.0", features = ["esp32c6", "internal-heap-stats"] }
 
 # Async runtime (Embassy core)
-embassy-executor = { version = "0.9.1", features = ["log", "nightly"] }
-embassy-time = { version = "0.5.0", features = ["log"], default-features = false }
-embassy-sync = { version = "0.7.2", features = ["log"] }
+embassy-executor = { version = "0.10.0", features = ["log", "nightly"] }
+embassy-time = { version = "0.5.1", features = ["log"], default-features = false }
+embassy-sync = { version = "0.8.0", features = ["log"] }
 
 # Networking and protocol stacks
-embassy-net = { version = "0.7.1", features = [
-    "dhcpv4",
-    "log",
-    "medium-ethernet",
-    "tcp",
-    "udp",
-    "proto-ipv4",
-    "dns"
-] }
-smoltcp = { version = "0.12.0", default-features = false, features = [
-    "alloc",
-    "log",
-    "medium-ethernet",
-    "multicast",
-    "proto-dhcpv4",
-    "proto-ipv6",
-    "proto-dns",
-    "proto-ipv4",
-    "socket-dns",
-    "socket-icmp",
-    "socket-raw",
-    "socket-tcp",
-    "socket-udp",
-] }
+embassy-net = { version = "0.8.0", features = ["dhcpv4", "log", "medium-ethernet", "tcp", "udp", "proto-ipv4", "dns", "proto-ipv6"] }
 sntpc = { version = "0.6.1", default-features = false, features = ["log", "embassy-socket", "embassy-socket-ipv6"] }
-edge-dhcp = "0.6.0"
-edge-nal = "0.5.0"
-edge-nal-embassy = "0.6.0"
-edge-http = { version = "0.6.1", features = ["log"] }
+edge-dhcp = "0.7.0"
+edge-nal = "0.6.0"
+edge-nal-embassy = "0.8.1"
+edge-http = { version = "0.7.0", features = ["log"] }
 
-esp32c6 = { version = "0.22.0" }
+esp32c6 = { version = "0.23.2" }
 
 # Hardware abstraction traits and HAL adapters
 embedded-hal = "1.0.0"
 embedded-storage = "0.3.1"
-embassy-embedded-hal = "0.5.0"
+embassy-embedded-hal = "0.6.0"
 embedded-can = "0.4.1"
 nb = "1.1.0"
 
@@ -109,13 +86,12 @@ pca9535 = { version = "2.0.0" }
 ina219 = { version = "0.2.0" }
 
 # Storage and filesystem
-littlefs2 = { version = "0.6.1", features = ["c-stubs", "alloc"] }
-littlefs2-core = "0.1.2"
+embedded-savegame = { version = "0.3.0" }
 
 # Serialization / codecs
 serde = { version = "1.0.228", features = ["derive", "alloc"], default-features = false }
 serde_json = { version = "1.0.145", default-features = false, features = ["alloc"] }
-bincode = { version = "2.0.1", default-features = false, features = ["derive"] }
+postcard = { version = "1.1.3", default-features = false, features = ["alloc"] }
 
 # Time and time zones
 chrono = { version = "0.4.42", default-features = false, features = ["iana-time-zone", "alloc", "serde"] }
@@ -133,12 +109,8 @@ unit-enum = "1.4.3"
 async-trait = "0.1.89"
 option-lock = { version = "0.3.1", default-features = false }
 measurements = "0.11.1"
+mcutie = { path = "src/mcutie_3_0_0", features = ["log"] }
 
-# Project-specific
-mcutie = { version = "0.3.0", default-features = false, features = ["log", "homeassistant"] }
-
-[patch.crates-io]
-mcutie = { git = 'https://github.com/empirephoenix/mcutie.git' }
 #bq34z100 = { path = "../../bq34z100_rust" }
 
 [build-dependencies]
diff --git a/Software/MainBoard/rust/build.rs b/Software/MainBoard/rust/build.rs
index 2cc5449..ec20e04 100644
--- a/Software/MainBoard/rust/build.rs
+++ b/Software/MainBoard/rust/build.rs
@@ -49,5 +49,8 @@ fn linker_be_nice() {
 
 fn main() {
     linker_be_nice();
+    // Non-existent path causes Cargo to always re-run this script,
+    // keeping VERGEN_BUILD_TIMESTAMP fresh on every build.
+    println!("cargo:rerun-if-changed=ALWAYS_REBUILD_SENTINEL");
     let _ = EmitBuilder::builder().all_git().all_build().emit();
 }
diff --git a/Software/MainBoard/rust/clippy.toml b/Software/MainBoard/rust/clippy.toml
new file mode 100644
index 0000000..de1e4a1
--- /dev/null
+++ b/Software/MainBoard/rust/clippy.toml
@@ -0,0 +1,2 @@
+# This file is used for clippy configuration. 
+# It shouldn't contain the deny attributes, which belong to the crate root.
diff --git a/Software/MainBoard/rust/espflash.toml b/Software/MainBoard/rust/espflash.toml
index 207afc6..f2a3eb8 100644
--- a/Software/MainBoard/rust/espflash.toml
+++ b/Software/MainBoard/rust/espflash.toml
@@ -1,8 +1,6 @@
-[connection]
+format = "EspIdf"
 
-[[usb_device]]
-vid = "303a"
-pid = "1001"
+[idf_format_args]
 
 [flash]
 size = "16MB"
diff --git a/Software/MainBoard/rust/src/config.rs b/Software/MainBoard/rust/src/config.rs
index 5dd6a7b..5ae2d5d 100644
--- a/Software/MainBoard/rust/src/config.rs
+++ b/Software/MainBoard/rust/src/config.rs
@@ -1,17 +1,16 @@
 use crate::hal::PLANT_COUNT;
 use crate::plant_state::PlantWateringMode;
-use alloc::string::String;
-use core::str::FromStr;
+use alloc::string::{String, ToString};
 use serde::{Deserialize, Serialize};
 
 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
 #[serde(default)]
 pub struct NetworkConfig {
-    pub ap_ssid: heapless::String<32>,
-    pub ssid: Option<heapless::String<32>>,
-    pub password: Option<heapless::String<64>>,
+    pub ap_ssid: String,
+    pub ssid: Option<String>,
+    pub password: Option<String>,
     pub mqtt_url: Option<String>,
-    pub base_topic: Option<heapless::String<64>>,
+    pub base_topic: Option<String>,
     pub mqtt_user: Option<String>,
     pub mqtt_password: Option<String>,
     pub max_wait: u32,
@@ -19,7 +18,7 @@ pub struct NetworkConfig {
 impl Default for NetworkConfig {
     fn default() -> Self {
         Self {
-            ap_ssid: heapless::String::from_str("PlantCtrl Init").unwrap(),
+            ap_ssid: "PlantCtrl Init".to_string(),
             ssid: None,
             password: None,
             mqtt_url: None,
@@ -96,6 +95,8 @@ pub enum BoardVersion {
 pub struct BoardHardware {
     pub board: BoardVersion,
     pub battery: BatteryBoardVersion,
+    #[serde(default)]
+    pub pump_corrosion_protection: bool,
 }
 
 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Default)]
@@ -128,6 +129,8 @@ pub struct PlantConfig {
     pub min_pump_current_ma: u16,
     pub max_pump_current_ma: u16,
     pub ignore_current_error: bool,
+    pub fertilizer_s: u16,
+    pub fertilizer_cooldown_min: u16,
 }
 
 impl Default for PlantConfig {
@@ -149,6 +152,8 @@ impl Default for PlantConfig {
             min_pump_current_ma: 10,
             max_pump_current_ma: 3000,
             ignore_current_error: true,
+            fertilizer_s: 0,
+            fertilizer_cooldown_min: 1440, // 1 day default
         }
     }
 }
diff --git a/Software/MainBoard/rust/src/fat_error.rs b/Software/MainBoard/rust/src/fat_error.rs
index 604b3f0..0032b1e 100644
--- a/Software/MainBoard/rust/src/fat_error.rs
+++ b/Software/MainBoard/rust/src/fat_error.rs
@@ -1,5 +1,7 @@
 use alloc::format;
 use alloc::string::{String, ToString};
+use chrono::format::ParseErrorKind;
+use chrono_tz::ParseError;
 use core::convert::Infallible;
 use core::fmt;
 use core::fmt::Debug;
@@ -14,28 +16,18 @@ use esp_hal::twai::EspTwaiError;
 use esp_radio::wifi::WifiError;
 use ina219::errors::{BusVoltageReadError, ShuntVoltageReadError};
 use lib_bms_protocol::BmsProtocolError;
-use littlefs2_core::PathError;
 use onewire::Error;
 use pca9535::ExpanderError;
 
 //All error superconstruct
 #[derive(Debug)]
 pub enum FatError {
-    BMSError {
-        error: String,
-    },
     OneWireError {
         error: Error<Infallible>,
     },
     String {
         error: String,
     },
-    LittleFSError {
-        error: littlefs2_core::Error,
-    },
-    PathError {
-        error: PathError,
-    },
     TryLockError {
         error: TryLockError,
     },
@@ -86,8 +78,6 @@ impl fmt::Display for FatError {
             }
             FatError::OneWireError { error } => write!(f, "OneWireError {error:?}"),
             FatError::String { error } => write!(f, "{error}"),
-            FatError::LittleFSError { error } => write!(f, "LittleFSError {error:?}"),
-            FatError::PathError { error } => write!(f, "PathError {error:?}"),
             FatError::TryLockError { error } => write!(f, "TryLockError {error:?}"),
             FatError::WifiError { error } => write!(f, "WifiError {error:?}"),
             FatError::SerdeError { error } => write!(f, "SerdeError {error:?}"),
@@ -106,7 +96,6 @@ impl fmt::Display for FatError {
                 write!(f, "CanBusError {error:?}")
             }
             FatError::SNTPError { error } => write!(f, "SNTPError {error:?}"),
-            FatError::BMSError { error } => write!(f, "BMSError, {error}"),
             FatError::OTAError => {
                 write!(f, "OTA missing partition")
             }
@@ -149,23 +138,28 @@ impl<T> ContextExt<T> for Option<T> {
     }
 }
 
+impl<T, E> ContextExt<T> for Result<T, E>
+where
+    E: fmt::Debug,
+{
+    fn context<C>(self, context: C) -> Result<T, FatError>
+    where
+        C: AsRef<str>,
+    {
+        match self {
+            Ok(value) => Ok(value),
+            Err(err) => Err(FatError::String {
+                error: format!("{}: {:?}", context.as_ref(), err),
+            }),
+        }
+    }
+}
+
 impl From<Error<Infallible>> for FatError {
     fn from(error: Error<Infallible>) -> Self {
         FatError::OneWireError { error }
     }
 }
-impl From<littlefs2_core::Error> for FatError {
-    fn from(value: littlefs2_core::Error) -> Self {
-        FatError::LittleFSError { error: value }
-    }
-}
-
-impl From<PathError> for FatError {
-    fn from(value: PathError) -> Self {
-        FatError::PathError { error: value }
-    }
-}
-
 impl From<TryLockError> for FatError {
     fn from(value: TryLockError) -> Self {
         FatError::TryLockError { error: value }
@@ -236,16 +230,8 @@ impl<E: fmt::Debug> From<ExpanderError<I2cDeviceError<E>>> for FatError {
     }
 }
 
-impl From<bincode::error::DecodeError> for FatError {
-    fn from(value: bincode::error::DecodeError) -> Self {
-        FatError::Eeprom24x {
-            error: format!("{value:?}"),
-        }
-    }
-}
-
-impl From<bincode::error::EncodeError> for FatError {
-    fn from(value: bincode::error::EncodeError) -> Self {
+impl From<postcard::Error> for FatError {
+    fn from(value: postcard::Error) -> Self {
         FatError::Eeprom24x {
             error: format!("{value:?}"),
         }
@@ -283,7 +269,7 @@ impl<E: fmt::Debug> From<ShuntVoltageReadError<I2cDeviceError<E>>> for FatError
 
 impl From<Infallible> for FatError {
     fn from(value: Infallible) -> Self {
-        panic!("Infallible error: {:?}", value)
+        match value {}
     }
 }
 
@@ -336,3 +322,27 @@ impl From<BmsProtocolError> for FatError {
         }
     }
 }
+
+impl From<ParseError> for FatError {
+    fn from(value: ParseError) -> Self {
+        FatError::String {
+            error: format!("Parsing error: {value:?}"),
+        }
+    }
+}
+
+impl From<ParseErrorKind> for FatError {
+    fn from(value: ParseErrorKind) -> Self {
+        FatError::String {
+            error: format!("Parsing error: {value:?}"),
+        }
+    }
+}
+
+impl From<chrono::format::ParseError> for FatError {
+    fn from(value: chrono::format::ParseError) -> Self {
+        FatError::String {
+            error: format!("Parsing error: {value:?}"),
+        }
+    }
+}
diff --git a/Software/MainBoard/rust/src/hal/esp.rs b/Software/MainBoard/rust/src/hal/esp.rs
index 5923a53..56e0e2d 100644
--- a/Software/MainBoard/rust/src/hal/esp.rs
+++ b/Software/MainBoard/rust/src/hal/esp.rs
@@ -1,24 +1,23 @@
 use crate::bail;
 use crate::config::{NetworkConfig, PlantControllerConfig};
-use crate::hal::{PLANT_COUNT, TIME_ACCESS};
-use crate::log::{LogMessage, LOG_ACCESS};
+use crate::hal::savegame_manager::SavegameManager;
+use crate::hal::PLANT_COUNT;
+use crate::log::{log, LogMessage};
 use chrono::{DateTime, Utc};
-use serde::Serialize;
 
 use crate::fat_error::{ContextExt, FatError, FatResult};
-use crate::hal::little_fs2storage_adapter::LittleFs2Filesystem;
 use crate::hal::shared_flash::MutexFlashStorage;
 use alloc::string::ToString;
 use alloc::sync::Arc;
 use alloc::{format, string::String, vec, vec::Vec};
 use core::net::{IpAddr, Ipv4Addr, SocketAddr};
-use core::str::FromStr;
 use core::sync::atomic::Ordering;
 use embassy_executor::Spawner;
-use embassy_net::udp::UdpSocket;
-use embassy_net::{DhcpConfig, Ipv4Cidr, Runner, Stack, StackResources, StaticConfigV4};
+use embassy_net::dns::DnsQueryType;
+use embassy_net::udp::{PacketMetadata, UdpSocket};
+use embassy_net::{DhcpConfig, IpAddress, Ipv4Cidr, Runner, Stack, StackResources, StaticConfigV4};
 use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
-use embassy_sync::mutex::{Mutex, MutexGuard};
+use embassy_sync::mutex::Mutex;
 use embassy_sync::once_lock::OnceLock;
 use embassy_time::{Duration, Timer, WithTimeout};
 use embedded_storage::nor_flash::{check_erase, NorFlash, ReadNorFlash, RmwNorFlashStorage};
@@ -35,32 +34,31 @@ use esp_hal::system::software_reset;
 use esp_hal::uart::Uart;
 use esp_hal::Blocking;
 use esp_println::println;
-use esp_radio::wifi::{
-    AccessPointConfig, AccessPointInfo, AuthMethod, ClientConfig, ModeConfig, ScanConfig,
-    ScanTypeConfig, WifiController, WifiDevice, WifiStaState,
-};
-use littlefs2::fs::Filesystem;
-use littlefs2_core::{FileType, PathBuf, SeekFrom};
+use esp_radio::wifi::ap::{AccessPointConfig, AccessPointInfo};
+use esp_radio::wifi::scan::{ScanConfig, ScanTypeConfig};
+use esp_radio::wifi::sta::StationConfig;
+use esp_radio::wifi::{AuthenticationMethod, Config, Interface, WifiController};
 use log::{error, info, warn};
 use mcutie::{
     Error, McutieBuilder, McutieReceiver, McutieTask, MqttMessage, PublishDisplay, Publishable,
     QoS, Topic,
 };
 use portable_atomic::AtomicBool;
-use smoltcp::socket::udp::PacketMetadata;
-use smoltcp::wire::DnsQueryType;
-use sntpc::{get_time, NtpContext, NtpTimestampGenerator};
+use sntpc::{get_time, NtpContext, NtpTimestampGenerator, NtpUdpSocket};
 
 #[esp_hal::ram(unstable(rtc_fast), unstable(persistent))]
 static mut LAST_WATERING_TIMESTAMP: [i64; PLANT_COUNT] = [0; PLANT_COUNT];
 #[esp_hal::ram(unstable(rtc_fast), unstable(persistent))]
 static mut CONSECUTIVE_WATERING_PLANT: [u32; PLANT_COUNT] = [0; PLANT_COUNT];
 #[esp_hal::ram(unstable(rtc_fast), unstable(persistent))]
+static mut LAST_FERTILIZER_TIMESTAMP: [i64; PLANT_COUNT] = [0; PLANT_COUNT];
+#[esp_hal::ram(unstable(rtc_fast), unstable(persistent))]
 static mut LOW_VOLTAGE_DETECTED: i8 = 0;
 #[esp_hal::ram(unstable(rtc_fast), unstable(persistent))]
 static mut RESTART_TO_CONF: i8 = 0;
+#[esp_hal::ram(unstable(rtc_fast), unstable(persistent))]
+static mut LAST_CORROSION_PROTECTION_CHECK_DAY: i8 = -1;
 
-const CONFIG_FILE: &str = "config.json";
 const NTP_SERVER: &str = "pool.ntp.org";
 
 static MQTT_CONNECTED_EVENT_RECEIVED: AtomicBool = AtomicBool::new(false);
@@ -68,24 +66,44 @@ static MQTT_ROUND_TRIP_RECEIVED: AtomicBool = AtomicBool::new(false);
 pub static MQTT_STAY_ALIVE: AtomicBool = AtomicBool::new(false);
 static MQTT_BASE_TOPIC: OnceLock<String> = OnceLock::new();
 
-#[derive(Serialize, Debug)]
-pub struct FileInfo {
-    filename: String,
-    size: usize,
-}
-
-#[derive(Serialize, Debug)]
-pub struct FileList {
-    total: usize,
-    used: usize,
-    files: Vec<FileInfo>,
-}
-
 #[derive(Copy, Clone, Default)]
 struct Timestamp {
     stamp: DateTime<Utc>,
 }
 
+struct EmbassyNtpSocket<'a, 'b> {
+    socket: &'a UdpSocket<'b>,
+}
+
+impl<'a, 'b> EmbassyNtpSocket<'a, 'b> {
+    fn new(socket: &'a UdpSocket<'b>) -> Self {
+        Self { socket }
+    }
+}
+
+impl NtpUdpSocket for EmbassyNtpSocket<'_, '_> {
+    async fn send_to(&self, buf: &[u8], addr: SocketAddr) -> sntpc::Result<usize> {
+        self.socket
+            .send_to(buf, addr)
+            .await
+            .map_err(|_| sntpc::Error::Network)?;
+        Ok(buf.len())
+    }
+
+    async fn recv_from(&self, buf: &mut [u8]) -> sntpc::Result<(usize, SocketAddr)> {
+        let (len, metadata) = self
+            .socket
+            .recv_from(buf)
+            .await
+            .map_err(|_| sntpc::Error::Network)?;
+        let addr = match metadata.endpoint.addr {
+            IpAddress::Ipv4(ip) => IpAddr::V4(ip),
+            IpAddress::Ipv6(ip) => IpAddr::V6(ip),
+        };
+        Ok((len, SocketAddr::new(addr, metadata.endpoint.port)))
+    }
+}
+
 // Minimal esp-idf equivalent for gpio_hold on esp32c6 via ROM functions
 extern "C" {
     fn gpio_pad_hold(gpio_num: u32);
@@ -117,11 +135,11 @@ impl NtpTimestampGenerator for Timestamp {
 }
 
 pub struct Esp<'a> {
-    pub fs: Arc<Mutex<CriticalSectionRawMutex, Filesystem<'static, LittleFs2Filesystem>>>,
+    pub savegame: SavegameManager,
     pub rng: Rng,
     //first starter (ap or sta will take these)
-    pub interface_sta: Option<WifiDevice<'static>>,
-    pub interface_ap: Option<WifiDevice<'static>>,
+    pub interface_sta: Option<Interface<'static>>,
+    pub interface_ap: Option<Interface<'static>>,
     pub controller: Arc<Mutex<CriticalSectionRawMutex, WifiController<'static>>>,
 
     pub boot_button: Input<'a>,
@@ -130,6 +148,8 @@ pub struct Esp<'a> {
     pub wake_gpio1: esp_hal::peripherals::GPIO1<'static>,
     pub uart0: Uart<'a, Blocking>,
 
+    pub rtc: Rtc<'a>,
+
     pub ota: Ota<'static, RmwNorFlashStorage<'static, &'static mut MutexFlashStorage>>,
     pub ota_target: &'static mut FlashRegion<'static, MutexFlashStorage>,
     pub current: AppPartitionSubType,
@@ -155,6 +175,15 @@ macro_rules! mk_static {
 }
 
 impl Esp<'_> {
+    pub fn get_time(&self) -> DateTime<Utc> {
+        DateTime::from_timestamp_micros(self.rtc.current_time_us() as i64)
+            .unwrap_or(DateTime::UNIX_EPOCH)
+    }
+
+    pub fn set_time(&mut self, time: DateTime<Utc>) {
+        self.rtc.set_current_time_us(time.timestamp_micros() as u64);
+    }
+
     pub(crate) async fn read_serial_line(&mut self) -> FatResult<Option<alloc::string::String>> {
         let mut buf = [0u8; 1];
         let mut line = String::new();
@@ -185,69 +214,6 @@ impl Esp<'_> {
             }
         }
     }
-    pub(crate) async fn delete_file(&self, filename: String) -> FatResult<()> {
-        let file = PathBuf::try_from(filename.as_str())?;
-        let access = self.fs.lock().await;
-        access.remove(&file)?;
-        Ok(())
-    }
-    pub(crate) async fn write_file(
-        &mut self,
-        filename: String,
-        offset: u32,
-        buf: &[u8],
-    ) -> Result<(), FatError> {
-        let file = PathBuf::try_from(filename.as_str())?;
-        let access = self.fs.lock().await;
-        access.open_file_with_options_and_then(
-            |options| options.read(true).write(true).create(true),
-            &file,
-            |file| {
-                file.seek(SeekFrom::Start(offset))?;
-                file.write(buf)?;
-                Ok(())
-            },
-        )?;
-        Ok(())
-    }
-
-    pub async fn get_size(&mut self, filename: String) -> FatResult<usize> {
-        let file = PathBuf::try_from(filename.as_str())?;
-        let access = self.fs.lock().await;
-        let data = access.metadata(&file)?;
-        Ok(data.len())
-    }
-    pub(crate) async fn get_file(
-        &mut self,
-        filename: String,
-        chunk: u32,
-    ) -> FatResult<([u8; 512], usize)> {
-        use littlefs2::io::Error as lfs2Error;
-
-        let file = PathBuf::try_from(filename.as_str())?;
-        let access = self.fs.lock().await;
-        let mut buf = [0_u8; 512];
-        let mut read = 0;
-        let offset = chunk * buf.len() as u32;
-        access.open_file_with_options_and_then(
-            |options| options.read(true),
-            &file,
-            |file| {
-                let length = file.len()? as u32;
-                if length == 0 {
-                    Err(lfs2Error::IO)
-                } else if length > offset {
-                    file.seek(SeekFrom::Start(offset))?;
-                    read = file.read(&mut buf)?;
-                    Ok(())
-                } else {
-                    //exactly at end, do nothing
-                    Ok(())
-                }
-            },
-        )?;
-        Ok((buf, read))
-    }
 
     pub(crate) async fn write_ota(&mut self, offset: u32, buf: &[u8]) -> Result<(), FatError> {
         let _ = check_erase(self.ota_target, offset, offset + 4096);
@@ -314,23 +280,26 @@ impl Esp<'_> {
             &mut tx_meta,
             &mut tx_buffer,
         );
-        socket.bind(123).unwrap();
+        socket.bind(123).context("Could not bind UDP socket")?;
 
         let context = NtpContext::new(Timestamp::default());
+        let ntp_socket = EmbassyNtpSocket::new(&socket);
 
         let ntp_addrs = stack
             .dns_query(NTP_SERVER, DnsQueryType::A)
-            .await;
-        if ntp_addrs.is_err() {
-            bail!("Failed to resolve DNS");
+            .await
+            .context("Failed to resolve DNS")?;
+
+        if ntp_addrs.is_empty() {
+            bail!("No IP addresses found for NTP server");
         }
-        let ntp = ntp_addrs.unwrap()[0];
+        let ntp = ntp_addrs[0];
         info!("NTP server: {ntp:?}");
 
         let mut counter = 0;
         loop {
             let addr: IpAddr = ntp.into();
-            let timeout = get_time(SocketAddr::from((addr, 123)), &socket, context)
+            let timeout = get_time(SocketAddr::from((addr, 123)), &ntp_socket, context)
                 .with_timeout(Duration::from_millis((_max_wait_ms / 10) as u64))
                 .await;
 
@@ -358,10 +327,10 @@ impl Esp<'_> {
         let mut lock = self.controller.try_lock()?;
         info!("start wifi scan lock");
         let scan_config = ScanConfig::default().with_scan_type(ScanTypeConfig::Active {
-            min: Default::default(),
-            max: Default::default(),
+            min: esp_hal::time::Duration::from_millis(0),
+            max: esp_hal::time::Duration::from_millis(0),
         });
-        let rv = lock.scan_with_config_async(scan_config).await?;
+        let rv = lock.scan_async(&scan_config).await?;
         info!("end wifi scan lock");
         Ok(rv)
     }
@@ -375,6 +344,14 @@ impl Esp<'_> {
             LAST_WATERING_TIMESTAMP[plant] = time.timestamp_millis();
         }
     }
+    pub(crate) fn last_fertilizer_time(&self, plant: usize) -> i64 {
+        unsafe { LAST_FERTILIZER_TIMESTAMP[plant] }
+    }
+    pub(crate) fn store_last_fertilizer_time(&mut self, plant: usize, time: DateTime<Utc>) {
+        unsafe {
+            LAST_FERTILIZER_TIMESTAMP[plant] = time.timestamp_millis();
+        }
+    }
     pub(crate) fn set_low_voltage_in_cycle(&mut self) {
         unsafe {
             LOW_VOLTAGE_DETECTED = 1;
@@ -409,6 +386,14 @@ impl Esp<'_> {
             }
         }
     }
+    pub(crate) fn get_last_corrosion_protection_check_day(&self) -> i8 {
+        unsafe { LAST_CORROSION_PROTECTION_CHECK_DAY }
+    }
+    pub(crate) fn set_last_corrosion_protection_check_day(&mut self, day: i8) {
+        unsafe {
+            LAST_CORROSION_PROTECTION_CHECK_DAY = day;
+        }
+    }
 
     pub(crate) async fn wifi_ap(&mut self, spawner: Spawner) -> FatResult<Stack<'static>> {
         let ssid = match self.load_config().await {
@@ -416,9 +401,11 @@ impl Esp<'_> {
             Err(_) => "PlantCtrl Emergency Mode".to_string(),
         };
 
-        let device = self.interface_ap.take().unwrap();
-        let gw_ip_addr_str = "192.168.71.1";
-        let gw_ip_addr = Ipv4Addr::from_str(gw_ip_addr_str).expect("failed to parse gateway ip");
+        let device = self
+            .interface_ap
+            .take()
+            .context("AP interface already taken")?;
+        let gw_ip_addr = Ipv4Addr::new(192, 168, 71, 1);
 
         let config = embassy_net::Config::ipv4_static(StaticConfigV4 {
             address: Ipv4Cidr::new(gw_ip_addr, 24),
@@ -439,15 +426,13 @@ impl Esp<'_> {
         let stack = mk_static!(Stack, stack);
 
         let client_config =
-            ModeConfig::AccessPoint(AccessPointConfig::default().with_ssid(ssid.clone()));
+            Config::AccessPoint(AccessPointConfig::default().with_ssid(ssid.clone()));
         self.controller.lock().await.set_config(&client_config)?;
 
-        println!("start new");
-        self.controller.lock().await.start()?;
         println!("start net task");
-        spawner.spawn(net_task(runner)).ok();
+        spawner.spawn(net_task(runner)?);
         println!("run dhcp");
-        spawner.spawn(run_dhcp(*stack, gw_ip_addr_str)).ok();
+        spawner.spawn(run_dhcp(*stack, gw_ip_addr)?);
 
         loop {
             if stack.is_link_up() {
@@ -458,7 +443,7 @@ impl Esp<'_> {
         while !stack.is_config_up() {
             Timer::after(Duration::from_millis(100)).await
         }
-        println!("Connect to the AP `${ssid}` and point your browser to http://{gw_ip_addr_str}/");
+        println!("Connect to the AP `${ssid}` and point your browser to http://{gw_ip_addr}/");
         stack
             .config_v4()
             .inspect(|c| println!("ipv4 config: {c:?}"));
@@ -472,18 +457,17 @@ impl Esp<'_> {
         spawner: Spawner,
     ) -> FatResult<Stack<'static>> {
         esp_radio::wifi_set_log_verbose();
-        let ssid = network_config.ssid.clone();
-        match &ssid {
+        let ssid = match &network_config.ssid {
             Some(ssid) => {
                 if ssid.is_empty() {
                     bail!("Wifi ssid was empty")
                 }
+                ssid.to_string()
             }
             None => {
                 bail!("Wifi ssid was empty")
             }
-        }
-        let ssid = ssid.unwrap().to_string();
+        };
         info!("attempting to connect wifi {ssid}");
         let password = match network_config.password {
             Some(ref password) => password.to_string(),
@@ -491,7 +475,10 @@ impl Esp<'_> {
         };
         let max_wait = network_config.max_wait;
 
-        let device = self.interface_sta.take().unwrap();
+        let device = self
+            .interface_sta
+            .take()
+            .context("STA interface already taken")?;
         let config = embassy_net::Config::dhcpv4(DhcpConfig::default());
 
         let seed = (self.rng.random() as u64) << 32 | self.rng.random() as u64;
@@ -505,100 +492,67 @@ impl Esp<'_> {
         );
         let stack = mk_static!(Stack, stack);
 
-        let client_config = ClientConfig::default()
+        let auth_method = if password.is_empty() {
+            AuthenticationMethod::None
+        } else {
+            AuthenticationMethod::Wpa2Personal
+        };
+        let client_config = StationConfig::default()
             .with_ssid(ssid)
-            .with_auth_method(AuthMethod::Wpa2Personal)
+            .with_auth_method(auth_method)
             .with_password(password);
 
         self.controller
             .lock()
             .await
-            .set_config(&ModeConfig::Client(client_config))?;
-        spawner.spawn(net_task(runner)).ok();
-        self.controller.lock().await.start_async().await?;
+            .set_config(&Config::Station(client_config))?;
+        spawner.spawn(net_task(runner)?);
+        self.controller
+            .lock()
+            .await
+            .connect_async()
+            .with_timeout(Duration::from_millis(max_wait as u64 * 1000))
+            .await
+            .context("Timeout waiting for wifi sta connected")??;
 
-        let timeout = {
-            let guard = TIME_ACCESS.get().await.lock().await;
-            guard.current_time_us()
-        } + max_wait as u64 * 1000;
-        loop {
-            let state = esp_radio::wifi::sta_state();
-            if state == WifiStaState::Started {
-                self.controller.lock().await.connect()?;
-                break;
+        let res = async {
+            while !stack.is_link_up() {
+                Timer::after(Duration::from_millis(500)).await;
             }
-            if {
-                let guard = TIME_ACCESS.get().await.lock().await;
-                guard.current_time_us()
-            } > timeout
-            {
-                bail!("Timeout waiting for wifi sta ready")
-            }
-            Timer::after(Duration::from_millis(500)).await;
+            Ok::<(), FatError>(())
         }
-        let timeout = {
-            let guard = TIME_ACCESS.get().await.lock().await;
-            guard.current_time_us()
-        } + max_wait as u64 * 1000;
-        loop {
-            let state = esp_radio::wifi::sta_state();
-            if state == WifiStaState::Connected {
-                break;
-            }
-            if {
-                let guard = TIME_ACCESS.get().await.lock().await;
-                guard.current_time_us()
-            } > timeout
-            {
-                bail!("Timeout waiting for wifi sta connected")
-            }
-            Timer::after(Duration::from_millis(500)).await;
+        .with_timeout(Duration::from_millis(max_wait as u64 * 1000))
+        .await;
+
+        if res.is_err() {
+            bail!("Timeout waiting for wifi link up")
         }
-        let timeout = {
-            let guard = TIME_ACCESS.get().await.lock().await;
-            guard.current_time_us()
-        } + max_wait as u64 * 1000;
-        while !stack.is_link_up() {
-            if {
-                let guard = TIME_ACCESS.get().await.lock().await;
-                guard.current_time_us()
-            } > timeout
-            {
-                bail!("Timeout waiting for wifi link up")
+
+        let res = async {
+            while !stack.is_config_up() {
+                Timer::after(Duration::from_millis(100)).await
             }
-            Timer::after(Duration::from_millis(500)).await;
+            Ok::<(), FatError>(())
         }
-        let timeout = {
-            let guard = TIME_ACCESS.get().await.lock().await;
-            guard.current_time_us()
-        } + max_wait as u64 * 1000;
-        while !stack.is_config_up() {
-            if {
-                let guard = TIME_ACCESS.get().await.lock().await;
-                guard.current_time_us()
-            } > timeout
-            {
-                bail!("Timeout waiting for wifi config up")
-            }
-            Timer::after(Duration::from_millis(100)).await
+        .with_timeout(Duration::from_millis(max_wait as u64 * 1000))
+        .await;
+
+        if res.is_err() {
+            bail!("Timeout waiting for wifi config up")
         }
 
         info!("Connected WIFI, dhcp: {:?}", stack.config_v4());
         Ok(*stack)
     }
 
-    pub fn deep_sleep(
-        &mut self,
-        duration_in_ms: u64,
-        mut rtc: MutexGuard<CriticalSectionRawMutex, Rtc>,
-    ) -> ! {
+    pub fn deep_sleep(&mut self, duration_in_ms: u64) -> ! {
         // Mark the current OTA image as valid if we reached here while in pending verify.
         if let Ok(cur) = self.ota.current_ota_state() {
             if cur == OtaImageState::PendingVerify {
                 info!("Marking OTA image as valid");
-                self.ota
-                    .set_current_ota_state(Valid)
-                    .expect("Could not set image to valid");
+                if let Err(err) = self.ota.set_current_ota_state(Valid) {
+                    error!("Could not set image to valid: {:?}", err);
+                }
             }
         } else {
             info!("No OTA image to mark as valid");
@@ -611,52 +565,54 @@ impl Esp<'_> {
             let mut wake_pins: [(&mut dyn RtcPinWithResistors, WakeupLevel); 1] =
                 [(&mut self.wake_gpio1, WakeupLevel::Low)];
             let ext1 = esp_hal::rtc_cntl::sleep::Ext1WakeupSource::new(&mut wake_pins);
-            rtc.sleep_deep(&[&timer, &ext1]);
+            self.rtc.sleep_deep(&[&timer, &ext1]);
         }
     }
 
+    /// Load the most recently saved config from flash.
     pub(crate) async fn load_config(&mut self) -> FatResult<PlantControllerConfig> {
-        let cfg = PathBuf::try_from(CONFIG_FILE)?;
-        let config_exist = self.fs.lock().await.exists(&cfg);
-        if !config_exist {
-            bail!("No config file stored")
-        }
-        let data = self.fs.lock().await.read::<4096>(&cfg)?;
-        let config: PlantControllerConfig = serde_json::from_slice(&data)?;
-        Ok(config)
-    }
-    pub(crate) async fn save_config(&mut self, config: Vec<u8>) -> FatResult<()> {
-        let filesystem = self.fs.lock().await;
-        let cfg = PathBuf::try_from(CONFIG_FILE)?;
-        filesystem.write(&cfg, &config)?;
-        Ok(())
-    }
-    pub(crate) async fn list_files(&self) -> FatResult<FileList> {
-        let path = PathBuf::new();
-
-        let fs = self.fs.lock().await;
-        let free_size = fs.available_space()?;
-        let total_size = fs.total_space();
-
-        let mut result = FileList {
-            total: total_size,
-            used: total_size - free_size,
-            files: Vec::new(),
-        };
-
-        fs.read_dir_and_then(&path, |dir| {
-            for entry in dir {
-                let e = entry?;
-                if e.file_type() == FileType::File {
-                    result.files.push(FileInfo {
-                        filename: e.path().to_string(),
-                        size: e.metadata().len(),
-                    });
-                }
+        match self.savegame.load_latest()? {
+            None => bail!("No config stored"),
+            Some(data) => {
+                let config: PlantControllerConfig = serde_json::from_slice(&data)?;
+                Ok(config)
             }
-            Ok(())
-        })?;
-        Ok(result)
+        }
+    }
+
+    /// Load a config from a specific save slot.
+    pub(crate) async fn load_config_slot(&mut self, idx: usize) -> FatResult<String> {
+        match self.savegame.load_slot(idx)? {
+            None => bail!("Slot {idx} is empty or invalid"),
+            Some(data) => Ok(String::from_utf8_lossy(&data).to_string()),
+        }
+    }
+
+    /// Persist a JSON config blob to the next wear-leveling slot.
+    /// Retries once on flash error.
+    pub(crate) async fn save_config(&mut self, config: Vec<u8>) -> FatResult<()> {
+        let timestamp = self.get_time().to_rfc3339();
+        self.savegame.save(config.as_slice(), &timestamp)?;
+
+        match self.savegame.load_latest()? {
+            None => bail!("Config save verification failed: no latest save found"),
+            Some(data) => {
+                let _: PlantControllerConfig = serde_json::from_slice(&data)?;
+                Ok(())
+            }
+        }
+    }
+
+    /// Delete a specific save slot by erasing it on flash.
+    pub(crate) async fn delete_save_slot(&mut self, idx: usize) -> FatResult<()> {
+        self.savegame.delete_slot(idx)
+    }
+
+    /// Return metadata about all valid save slots.
+    pub(crate) async fn list_saves(
+        &mut self,
+    ) -> FatResult<alloc::vec::Vec<crate::hal::savegame_manager::SaveInfo>> {
+        self.savegame.list_saves()
     }
 
     pub(crate) async fn init_rtc_deepsleep_memory(
@@ -674,34 +630,27 @@ impl Esp<'_> {
                 } else {
                     RESTART_TO_CONF = 0;
                 }
+                LAST_CORROSION_PROTECTION_CHECK_DAY = -1;
             };
         } else {
             unsafe {
                 if to_config_mode {
                     RESTART_TO_CONF = 1;
                 }
-                LOG_ACCESS
-                    .lock()
-                    .await
-                    .log(
-                        LogMessage::RestartToConfig,
-                        RESTART_TO_CONF as u32,
-                        0,
-                        "",
-                        "",
-                    )
-                    .await;
-                LOG_ACCESS
-                    .lock()
-                    .await
-                    .log(
-                        LogMessage::LowVoltage,
-                        LOW_VOLTAGE_DETECTED as u32,
-                        0,
-                        "",
-                        "",
-                    )
-                    .await;
+                log(
+                    LogMessage::RestartToConfig,
+                    RESTART_TO_CONF as u32,
+                    0,
+                    "",
+                    "",
+                );
+                log(
+                    LogMessage::LowVoltage,
+                    LOW_VOLTAGE_DETECTED as u32,
+                    0,
+                    "",
+                    "",
+                );
                 // is executed before main, no other code will alter these values during printing
                 #[allow(static_mut_refs)]
                 for (i, time) in LAST_WATERING_TIMESTAMP.iter().enumerate() {
@@ -749,11 +698,11 @@ impl Esp<'_> {
 
         let mut builder: McutieBuilder<'_, String, PublishDisplay<String, &str>, 0> =
             McutieBuilder::new(stack, "plant ctrl", mqtt_url);
-        if network_config.mqtt_user.is_some() && network_config.mqtt_password.is_some() {
-            builder = builder.with_authentication(
-                network_config.mqtt_user.as_ref().unwrap().as_str(),
-                network_config.mqtt_password.as_ref().unwrap().as_str(),
-            );
+        if let (Some(mqtt_user), Some(mqtt_password)) = (
+            network_config.mqtt_user.as_ref(),
+            network_config.mqtt_password.as_ref(),
+        ) {
+            builder = builder.with_authentication(mqtt_user, mqtt_password);
             info!("With authentification");
         }
 
@@ -777,52 +726,47 @@ impl Esp<'_> {
             receiver,
             round_trip_topic.clone(),
             stay_alive_topic.clone(),
-        ))?;
-        spawner.spawn(mqtt_runner(task))?;
+        )?);
+        spawner.spawn(mqtt_runner(task)?);
 
-        LOG_ACCESS
-            .lock()
-            .await
-            .log(LogMessage::StayAlive, 0, 0, "", &stay_alive_topic)
-            .await;
+        log(LogMessage::StayAlive, 0, 0, "", &stay_alive_topic);
 
-        LOG_ACCESS
-            .lock()
-            .await
-            .log(LogMessage::MqttInfo, 0, 0, "", mqtt_url)
-            .await;
+        log(LogMessage::MqttInfo, 0, 0, "", mqtt_url);
 
         let mqtt_timeout = 15000;
-        let timeout = {
-            let guard = TIME_ACCESS.get().await.lock().await;
-            guard.current_time_us()
-        } + mqtt_timeout as u64 * 1000;
-        while !MQTT_CONNECTED_EVENT_RECEIVED.load(Ordering::Relaxed) {
-            let cur = TIME_ACCESS.get().await.lock().await.current_time_us();
-            if cur > timeout {
-                bail!("Timeout waiting MQTT connect event")
+        let res = async {
+            while !MQTT_CONNECTED_EVENT_RECEIVED.load(Ordering::Relaxed) {
+                crate::hal::PlantHal::feed_watchdog();
+                Timer::after(Duration::from_millis(100)).await;
             }
-            Timer::after(Duration::from_millis(100)).await;
+            Ok::<(), FatError>(())
+        }
+        .with_timeout(Duration::from_millis(mqtt_timeout as u64))
+        .await;
+
+        if res.is_err() {
+            bail!("Timeout waiting MQTT connect event")
         }
 
-        Topic::General(round_trip_topic.clone())
+        let _ = Topic::General(round_trip_topic.clone())
             .with_display("online_text")
             .publish()
-            .await
-            .unwrap();
+            .await;
 
-        let timeout = {
-            let guard = TIME_ACCESS.get().await.lock().await;
-            guard.current_time_us()
-        } + mqtt_timeout as u64 * 1000;
-        while !MQTT_ROUND_TRIP_RECEIVED.load(Ordering::Relaxed) {
-            let cur = TIME_ACCESS.get().await.lock().await.current_time_us();
-            if cur > timeout {
-                //ensure we do not further try to publish
-                MQTT_CONNECTED_EVENT_RECEIVED.store(false, Ordering::Relaxed);
-                bail!("Timeout waiting MQTT roundtrip")
+        let res = async {
+            while !MQTT_ROUND_TRIP_RECEIVED.load(Ordering::Relaxed) {
+                crate::hal::PlantHal::feed_watchdog();
+                Timer::after(Duration::from_millis(100)).await;
             }
-            Timer::after(Duration::from_millis(100)).await;
+            Ok::<(), FatError>(())
+        }
+        .with_timeout(Duration::from_millis(mqtt_timeout as u64))
+        .await;
+
+        if res.is_err() {
+            //ensure we do not further try to publish
+            MQTT_CONNECTED_EVENT_RECEIVED.store(false, Ordering::Relaxed);
+            bail!("Timeout waiting MQTT roundtrip")
         }
         Ok(())
     }
@@ -855,6 +799,7 @@ impl Esp<'_> {
                         Error::TooLarge => false,
                         Error::PacketError => false,
                         Error::Invalid => false,
+                        Error::Rejected => false,
                     };
                     if !retry {
                         bail!(
@@ -929,18 +874,10 @@ async fn mqtt_incoming_task(
                             true => 1,
                             false => 0,
                         };
-                        LOG_ACCESS
-                            .lock()
-                            .await
-                            .log(LogMessage::MqttStayAliveRec, a, 0, "", "")
-                            .await;
+                        log(LogMessage::MqttStayAliveRec, a, 0, "", "");
                         MQTT_STAY_ALIVE.store(value, Ordering::Relaxed);
                     } else {
-                        LOG_ACCESS
-                            .lock()
-                            .await
-                            .log(LogMessage::UnknownTopic, 0, 0, "", &topic)
-                            .await;
+                        log(LogMessage::UnknownTopic, 0, 0, "", &topic);
                     }
                 }
             },
@@ -948,21 +885,18 @@ async fn mqtt_incoming_task(
                 MQTT_CONNECTED_EVENT_RECEIVED.store(false, Ordering::Relaxed);
                 info!("Mqtt disconnected");
             }
-            MqttMessage::HomeAssistantOnline => {
-                info!("Home assistant is online");
-            }
         }
     }
 }
 
 #[embassy_executor::task(pool_size = 2)]
-async fn net_task(mut runner: Runner<'static, WifiDevice<'static>>) {
+async fn net_task(mut runner: Runner<'static, Interface<'static>>) {
     runner.run().await;
 }
 
 #[embassy_executor::task]
-async fn run_dhcp(stack: Stack<'static>, gw_ip_addr: &'static str) {
-    use core::net::{Ipv4Addr, SocketAddrV4};
+async fn run_dhcp(stack: Stack<'static>, ip: Ipv4Addr) {
+    use core::net::SocketAddrV4;
 
     use edge_dhcp::{
         io::{self, DEFAULT_SERVER_PORT},
@@ -971,21 +905,25 @@ async fn run_dhcp(stack: Stack<'static>, gw_ip_addr: &'static str) {
     use edge_nal::UdpBind;
     use edge_nal_embassy::{Udp, UdpBuffers};
 
-    let ip = Ipv4Addr::from_str(gw_ip_addr).expect("dhcp task failed to parse gw ip");
-
     let mut buf = [0u8; 1500];
 
     let mut gw_buf = [Ipv4Addr::UNSPECIFIED];
 
     let buffers = UdpBuffers::<3, 1024, 1024, 10>::new();
     let unbound_socket = Udp::new(stack, &buffers);
-    let mut bound_socket = unbound_socket
+    let mut bound_socket = match unbound_socket
         .bind(SocketAddr::V4(SocketAddrV4::new(
             Ipv4Addr::UNSPECIFIED,
             DEFAULT_SERVER_PORT,
         )))
         .await
-        .unwrap();
+    {
+        Ok(s) => s,
+        Err(e) => {
+            error!("dhcp task failed to bind socket: {:?}", e);
+            return;
+        }
+    };
 
     loop {
         _ = io::server::run(
diff --git a/Software/MainBoard/rust/src/hal/little_fs2storage_adapter.rs b/Software/MainBoard/rust/src/hal/little_fs2storage_adapter.rs
deleted file mode 100644
index c3b7a80..0000000
--- a/Software/MainBoard/rust/src/hal/little_fs2storage_adapter.rs
+++ /dev/null
@@ -1,88 +0,0 @@
-use crate::hal::shared_flash::MutexFlashStorage;
-use embedded_storage::nor_flash::{check_erase, NorFlash, ReadNorFlash};
-use esp_bootloader_esp_idf::partitions::FlashRegion;
-use littlefs2::consts::U4096 as lfsCache;
-use littlefs2::consts::U512 as lfsLookahead;
-use littlefs2::driver::Storage as lfs2Storage;
-use littlefs2::io::Error as lfs2Error;
-use littlefs2::io::Result as lfs2Result;
-use log::error;
-
-pub struct LittleFs2Filesystem {
-    pub(crate) storage: &'static mut FlashRegion<'static, MutexFlashStorage>,
-}
-
-impl lfs2Storage for LittleFs2Filesystem {
-    const READ_SIZE: usize = 4096;
-    const WRITE_SIZE: usize = 4096;
-    const BLOCK_SIZE: usize = 4096; //usually optimal for flash access
-    const BLOCK_COUNT: usize = 8 * 1000 * 1000 / 4096; //8Mb in 4k blocks + a little space for stupid calculation errors
-    const BLOCK_CYCLES: isize = 100;
-    type CACHE_SIZE = lfsCache;
-    type LOOKAHEAD_SIZE = lfsLookahead;
-
-    fn read(&mut self, off: usize, buf: &mut [u8]) -> lfs2Result<usize> {
-        let read_size: usize = Self::READ_SIZE;
-        if off % read_size != 0 {
-            error!("Littlefs2Filesystem read error: offset not aligned to read size offset: {off} read_size: {read_size}");
-            return Err(lfs2Error::IO);
-        }
-        if buf.len() % read_size != 0 {
-            error!("Littlefs2Filesystem read error: length not aligned to read size length: {} read_size: {}", buf.len(), read_size);
-            return Err(lfs2Error::IO);
-        }
-        match self.storage.read(off as u32, buf) {
-            Ok(..) => Ok(buf.len()),
-            Err(err) => {
-                error!("Littlefs2Filesystem read error: {err:?}");
-                Err(lfs2Error::IO)
-            }
-        }
-    }
-
-    fn write(&mut self, off: usize, data: &[u8]) -> lfs2Result<usize> {
-        let write_size: usize = Self::WRITE_SIZE;
-        if off % write_size != 0 {
-            error!("Littlefs2Filesystem write error: offset not aligned to write size offset: {off} write_size: {write_size}");
-            return Err(lfs2Error::IO);
-        }
-        if data.len() % write_size != 0 {
-            error!("Littlefs2Filesystem write error: length not aligned to write size length: {} write_size: {}", data.len(), write_size);
-            return Err(lfs2Error::IO);
-        }
-        match self.storage.write(off as u32, data) {
-            Ok(..) => Ok(data.len()),
-            Err(err) => {
-                error!("Littlefs2Filesystem write error: {err:?}");
-                Err(lfs2Error::IO)
-            }
-        }
-    }
-
-    fn erase(&mut self, off: usize, len: usize) -> lfs2Result<usize> {
-        let block_size: usize = Self::BLOCK_SIZE;
-        if off % block_size != 0 {
-            error!("Littlefs2Filesystem erase error: offset not aligned to block size offset: {off} block_size: {block_size}");
-            return Err(lfs2Error::IO);
-        }
-        if len % block_size != 0 {
-            error!("Littlefs2Filesystem erase error: length not aligned to block size length: {len} block_size: {block_size}");
-            return Err(lfs2Error::IO);
-        }
-
-        match check_erase(self.storage, off as u32, (off + len) as u32) {
-            Ok(_) => {}
-            Err(err) => {
-                error!("Littlefs2Filesystem check erase error: {err:?}");
-                return Err(lfs2Error::IO);
-            }
-        }
-        match self.storage.erase(off as u32, (off + len) as u32) {
-            Ok(..) => Ok(len),
-            Err(err) => {
-                error!("Littlefs2Filesystem erase error: {err:?}");
-                Err(lfs2Error::IO)
-            }
-        }
-    }
-}
diff --git a/Software/MainBoard/rust/src/hal/mod.rs b/Software/MainBoard/rust/src/hal/mod.rs
index b350fc6..e64d2b9 100644
--- a/Software/MainBoard/rust/src/hal/mod.rs
+++ b/Software/MainBoard/rust/src/hal/mod.rs
@@ -3,14 +3,14 @@ use lib_bms_protocol::BmsReadable;
 pub(crate) mod battery;
 // mod can_api; // replaced by external canapi crate
 pub mod esp;
-mod little_fs2storage_adapter;
 pub(crate) mod rtc;
+pub(crate) mod savegame_manager;
 mod shared_flash;
 mod v4_hal;
 mod water;
 
 use crate::alloc::string::ToString;
-use crate::hal::rtc::{DS3231Module, RTCModuleInteraction};
+use crate::hal::rtc::{BackupHeader, DS3231Module, RTCModuleInteraction};
 use esp_hal::peripherals::Peripherals;
 use esp_hal::peripherals::ADC1;
 use esp_hal::peripherals::GPIO0;
@@ -44,14 +44,13 @@ use crate::{
         battery::{BatteryInteraction, NoBatteryMonitor},
         esp::Esp,
     },
+    log::log,
     log::LogMessage,
-    BOARD_ACCESS,
 };
 use alloc::boxed::Box;
 use alloc::format;
 use alloc::sync::Arc;
 use async_trait::async_trait;
-use bincode::{Decode, Encode};
 use canapi::SensorSlot;
 use chrono::{DateTime, FixedOffset, Utc};
 use core::cell::RefCell;
@@ -75,9 +74,8 @@ use measurements::{Current, Voltage};
 
 use crate::fat_error::{ContextExt, FatError, FatResult};
 use crate::hal::battery::WCHI2CSlave;
-use crate::hal::little_fs2storage_adapter::LittleFs2Filesystem;
+use crate::hal::savegame_manager::SavegameManager;
 use crate::hal::water::TankSensor;
-use crate::log::LOG_ACCESS;
 use embassy_sync::mutex::Mutex;
 use embassy_sync::once_lock::OnceLock;
 use embedded_storage::nor_flash::RmwNorFlashStorage;
@@ -86,39 +84,40 @@ use esp_alloc as _;
 use esp_backtrace as _;
 use esp_bootloader_esp_idf::ota::{Ota, OtaImageState};
 use esp_hal::delay::Delay;
-use esp_hal::i2c::master::{BusTimeout, Config, I2c};
+use esp_hal::i2c::master::{BusTimeout, Config, FsmTimeout, I2c};
 use esp_hal::interrupt::software::SoftwareInterruptControl;
 use esp_hal::pcnt::unit::Unit;
 use esp_hal::pcnt::Pcnt;
 use esp_hal::rng::Rng;
 use esp_hal::rtc_cntl::{Rtc, SocResetReason};
 use esp_hal::system::reset_reason;
-use esp_hal::time::Rate;
-use esp_hal::timer::timg::TimerGroup;
+use esp_hal::timer::timg::{MwdtStage, TimerGroup, Wdt};
 use esp_hal::uart::Uart;
 use esp_hal::Blocking;
-use esp_radio::{init, Controller};
 use esp_storage::FlashStorage;
-use littlefs2::fs::{Allocation, Filesystem as lfs2Filesystem};
-use littlefs2::object_safe::DynStorage;
-use log::{error, info, warn};
+use log::{info, warn};
 use portable_atomic::AtomicBool;
 use serde::{Deserialize, Serialize};
 use shared_flash::MutexFlashStorage;
 
-pub static TIME_ACCESS: OnceLock<Mutex<CriticalSectionRawMutex, Rtc>> = OnceLock::new();
-
 //Only support for 8 right now!
 pub const PLANT_COUNT: usize = 8;
 
 pub static PROGRESS_ACTIVE: AtomicBool = AtomicBool::new(false);
 
+pub static WATCHDOG: OnceLock<
+    embassy_sync::blocking_mutex::Mutex<
+        CriticalSectionRawMutex,
+        RefCell<Wdt<esp_hal::peripherals::TIMG0>>,
+    >,
+> = OnceLock::new();
+
 const TANK_MULTI_SAMPLE: usize = 11;
 pub static I2C_DRIVER: OnceLock<
     embassy_sync::blocking_mutex::Mutex<CriticalSectionRawMutex, RefCell<I2c<Blocking>>>,
 > = OnceLock::new();
 
-#[derive(Debug, PartialEq, Clone, Copy, Encode, Decode)]
+#[derive(Debug, PartialEq, Clone, Copy, Serialize, Deserialize)]
 pub enum Sensor {
     A,
     B,
@@ -147,8 +146,10 @@ pub trait BoardInteraction<'a> {
     fn get_config(&mut self) -> &PlantControllerConfig;
     fn get_battery_monitor(&mut self) -> &mut Box<dyn BatteryInteraction + Send>;
     fn get_rtc_module(&mut self) -> &mut Box<dyn RTCModuleInteraction + Send>;
+    async fn get_time(&mut self) -> DateTime<Utc>;
+    async fn set_time(&mut self, time: &DateTime<FixedOffset>) -> FatResult<()>;
     async fn set_charge_indicator(&mut self, charging: bool) -> Result<(), FatError>;
-    async fn deep_sleep(&mut self, duration_in_ms: u64) -> !;
+    async fn deep_sleep_ms(&mut self, duration_in_ms: u64) -> !;
 
     fn is_day(&self) -> bool;
     //should be multsampled
@@ -163,16 +164,29 @@ pub trait BoardInteraction<'a> {
     async fn get_mptt_voltage(&mut self) -> FatResult<Voltage>;
     async fn get_mptt_current(&mut self) -> FatResult<Current>;
     async fn can_power(&mut self, state: bool) -> FatResult<()>;
+    async fn fertilizer_pump(&mut self, enable: bool) -> FatResult<()>;
+
+    async fn backup_config(&mut self, config: &PlantControllerConfig) -> FatResult<()>;
+    async fn read_backup(&mut self) -> FatResult<PlantControllerConfig>;
+    async fn backup_info(&mut self) -> FatResult<BackupHeader>;
 
     // Return JSON string with autodetected sensors per plant. Default: not supported.
-    async fn detect_sensors(&mut self, _request: Detection) -> FatResult<Detection> {
+    async fn detect_sensors(&mut self, _request: DetectionRequest) -> FatResult<Detection> {
         bail!("Autodetection is only available on v4 HAL with CAN bus");
     }
 
+    /// Return the last known firmware build timestamps per sensor, set during detect_sensors.
+    fn get_sensor_build_minutes(&self) -> ([Option<u32>; PLANT_COUNT], [Option<u32>; PLANT_COUNT]) {
+        ([None; PLANT_COUNT], [None; PLANT_COUNT])
+    }
+
     async fn progress(&mut self, counter: u32) {
         // Indicate progress is active to suppress default wait_infinity blinking
         PROGRESS_ACTIVE.store(true, core::sync::atomic::Ordering::Relaxed);
 
+        // Feed watchdog during long-running webserver operations
+        PlantHal::feed_watchdog();
+
         let current = counter % PLANT_COUNT as u32;
         for led in 0..PLANT_COUNT {
             if let Err(err) = self.fault(led, current == led as u32).await {
@@ -244,17 +258,23 @@ impl PlantHal {
         esp_alloc::heap_allocator!(size: 64 * 1024);
         esp_alloc::heap_allocator!(#[link_section = ".dram2_uninit"] size: 64000);
 
-        let rtc: Rtc = Rtc::new(peripherals.LPWR);
-        TIME_ACCESS
-            .init(Mutex::new(rtc))
-            .map_err(|_| FatError::String {
-                error: "Init error rct".to_string(),
-            })?;
+        let mut rtc_peripheral: Rtc = Rtc::new(peripherals.LPWR);
+        rtc_peripheral.rwdt.disable();
 
         let timg0 = TimerGroup::new(peripherals.TIMG0);
         let sw_int = SoftwareInterruptControl::new(peripherals.SW_INTERRUPT);
         esp_rtos::start(timg0.timer0, sw_int.software_interrupt0);
 
+        // Initialize and enable the watchdog with 30 second timeout
+        let mut wdt = timg0.wdt;
+        wdt.set_timeout(MwdtStage::Stage0, esp_hal::time::Duration::from_secs(30));
+        wdt.enable();
+        WATCHDOG
+            .init(embassy_sync::blocking_mutex::Mutex::new(RefCell::new(wdt)))
+            .map_err(|_| FatError::String {
+                error: "Watchdog already initialized".to_string(),
+            })?;
+
         let boot_button = Input::new(
             peripherals.GPIO9,
             InputConfig::default().with_pull(Pull::None),
@@ -264,14 +284,11 @@ impl PlantHal {
         let wake_gpio1 = peripherals.GPIO1;
 
         let rng = Rng::new();
-        let esp_wifi_ctrl = &*mk_static!(
-            Controller<'static>,
-            init().expect("Could not init wifi controller")
-        );
 
-        let (controller, interfaces) =
-            esp_radio::wifi::new(esp_wifi_ctrl, peripherals.WIFI, Default::default())
-                .expect("Could not init wifi");
+        let (controller, interfaces) = esp_radio::wifi::new(peripherals.WIFI, Default::default())
+            .map_err(|e| FatError::String {
+            error: format!("Could not init wifi: {:?}", e),
+        })?;
 
         let pcnt_module = Pcnt::new(peripherals.PCNT);
 
@@ -325,19 +342,16 @@ impl PlantHal {
             pt.find_partition(esp_bootloader_esp_idf::partitions::PartitionType::Data(
                 DataPartitionSubType::Ota,
             ))?
-            .expect("No OTA data partition found")
+            .context("No OTA data partition found")?
         );
 
-        let ota_data = mk_static!(
-            FlashRegion<RmwNorFlashStorage<&mut MutexFlashStorage>>,
-            ota_data.as_embedded_storage(mk_static!(
-                RmwNorFlashStorage<&mut MutexFlashStorage>,
-                RmwNorFlashStorage::new(flash_storage_2, mk_static!([u8; 4096], [0_u8; 4096]))
-            ))
-        );
+        let mut ota_data = ota_data.as_embedded_storage(mk_static!(
+            RmwNorFlashStorage<&mut MutexFlashStorage>,
+            RmwNorFlashStorage::new(flash_storage_2, mk_static!([u8; 4096], [0_u8; 4096]))
+        ));
 
-        let state_0 = ota_state(AppPartitionSubType::Ota0, ota_data);
-        let state_1 = ota_state(AppPartitionSubType::Ota1, ota_data);
+        let state_0 = ota_state(AppPartitionSubType::Ota0, &mut ota_data);
+        let state_1 = ota_state(AppPartitionSubType::Ota1, &mut ota_data);
         let mut ota = Ota::new(ota_data, 2)?;
         let running = get_current_slot(&pt, &mut ota)?;
         let target = next_partition(running)?;
@@ -370,42 +384,30 @@ impl PlantHal {
             .find_partition(esp_bootloader_esp_idf::partitions::PartitionType::Data(
                 DataPartitionSubType::LittleFs,
             ))?
-            .expect("Data partition with littlefs not found");
+            .context("Storage data partition not found")?;
         let data_partition = mk_static!(PartitionEntry, data_partition);
 
         let data = mk_static!(
-            FlashRegion<MutexFlashStorage>,
+            FlashRegion<'static, MutexFlashStorage>,
             data_partition.as_embedded_storage(flash_storage_3)
         );
-        let lfs2filesystem = mk_static!(LittleFs2Filesystem, LittleFs2Filesystem { storage: data });
-        let alloc = mk_static!(Allocation<LittleFs2Filesystem>, lfs2Filesystem::allocate());
-        if lfs2filesystem.is_mountable() {
-            info!("Littlefs2 filesystem is mountable");
-        } else {
-            match lfs2filesystem.format() {
-                Ok(..) => {
-                    info!("Littlefs2 filesystem is formatted");
-                }
-                Err(err) => {
-                    error!("Littlefs2 filesystem could not be formatted: {err:?}");
-                }
-            }
-        }
 
-        #[allow(clippy::arc_with_non_send_sync)]
-        let fs = Arc::new(Mutex::new(
-            lfs2Filesystem::mount(alloc, lfs2filesystem).expect("Could not mount lfs2 filesystem"),
-        ));
+        let savegame = SavegameManager::new(data);
+        info!(
+            "Savegame storage initialized ({} slots × {} KB)",
+            savegame_manager::SAVEGAME_SLOT_COUNT,
+            savegame_manager::SAVEGAME_SLOT_SIZE / 1024
+        );
 
         let uart0 =
             Uart::new(peripherals.UART0, UartConfig::default()).map_err(|_| FatError::String {
                 error: "Uart creation failed".to_string(),
             })?;
 
-        let ap = interfaces.ap;
-        let sta = interfaces.sta;
+        let ap = interfaces.access_point;
+        let sta = interfaces.station;
         let mut esp = Esp {
-            fs,
+            savegame,
             rng,
             controller: Arc::new(Mutex::new(controller)),
             interface_sta: Some(sta),
@@ -418,6 +420,7 @@ impl PlantHal {
             slot0_state: state_0,
             slot1_state: state_1,
             uart0,
+            rtc: rtc_peripheral,
         };
 
         //init,reset rtc memory depending on cause
@@ -453,17 +456,13 @@ impl PlantHal {
                 SocResetReason::Cpu0JtagCpu => "cpu0 jtag cpu",
             },
         };
-        LOG_ACCESS
-            .lock()
-            .await
-            .log(
-                LogMessage::ResetReason,
-                init_rtc_store as u32,
-                to_config_mode as u32,
-                "",
-                &format!("{reasons:?}"),
-            )
-            .await;
+        log(
+            LogMessage::ResetReason,
+            init_rtc_store as u32,
+            to_config_mode as u32,
+            "",
+            &format!("{reasons:?}"),
+        );
 
         esp.init_rtc_deepsleep_memory(init_rtc_store, to_config_mode)
             .await;
@@ -475,11 +474,16 @@ impl PlantHal {
         let sda = peripherals.GPIO20;
         let scl = peripherals.GPIO19;
 
+        // Configure I2C with 1-second timeout
+        // At 100 Hz I2C clock, one bus cycle = 10ms
+        // For 1 second timeout: 100 bus cycles
         let i2c = I2c::new(
             peripherals.I2C0,
             Config::default()
-                .with_frequency(Rate::from_hz(100))
-                .with_timeout(BusTimeout::Maximum),
+                //.with_frequency(Rate::from_hz(100))
+                //1s at 100khz
+                .with_timeout(BusTimeout::BusCycles(100_000))
+                .with_scl_main_st_timeout(FsmTimeout::new(21)?),
         )?
         .with_scl(scl)
         .with_sda(sda);
@@ -488,7 +492,9 @@ impl PlantHal {
             RefCell<I2c<Blocking>>,
         > = CriticalSectionMutex::new(RefCell::new(i2c));
 
-        I2C_DRIVER.init(i2c_bus).expect("Could not init i2c driver");
+        I2C_DRIVER.init(i2c_bus).map_err(|_| FatError::String {
+            error: "Could not init i2c driver".to_string(),
+        })?;
 
         let i2c_bus = I2C_DRIVER.get().await;
         let rtc_device = I2cDevice::new(i2c_bus);
@@ -555,17 +561,13 @@ impl PlantHal {
                 HAL { board_hal }
             }
             Err(err) => {
-                LOG_ACCESS
-                    .lock()
-                    .await
-                    .log(
-                        LogMessage::ConfigModeMissingConfig,
-                        0,
-                        0,
-                        "",
-                        &err.to_string(),
-                    )
-                    .await;
+                log(
+                    LogMessage::ConfigModeMissingConfig,
+                    0,
+                    0,
+                    "",
+                    &err.to_string(),
+                );
                 HAL {
                     board_hal: v4_hal::create_v4(
                         free_pins,
@@ -581,6 +583,15 @@ impl PlantHal {
 
         Ok(Mutex::new(hal))
     }
+
+    /// Feed the watchdog timer to prevent system reset
+    pub fn feed_watchdog() {
+        if let Some(wdt_mutex) = WATCHDOG.try_get() {
+            wdt_mutex.lock(|cell| {
+                cell.borrow_mut().feed();
+            });
+        }
+    }
 }
 
 fn ota_state(
@@ -648,39 +659,38 @@ pub fn next_partition(current: AppPartitionSubType) -> FatResult<AppPartitionSub
     Ok(next)
 }
 
-pub async fn esp_time() -> DateTime<Utc> {
-    let guard = TIME_ACCESS.get().await.lock().await;
-    DateTime::from_timestamp_micros(guard.current_time_us() as i64).unwrap()
-}
-
-pub async fn esp_set_time(time: DateTime<FixedOffset>) -> FatResult<()> {
-    {
-        let guard = TIME_ACCESS.get().await.lock().await;
-        guard.set_current_time_us(time.timestamp_micros() as u64);
-    }
-    BOARD_ACCESS
-        .get()
-        .await
-        .lock()
-        .await
-        .board_hal
-        .get_rtc_module()
-        .set_rtc_time(&time.to_utc())
-        .await
-}
-
 #[derive(Debug, Clone, Copy, PartialEq, Default, Serialize)]
 pub struct Moistures {
     pub sensor_a_hz: [Option<f32>; PLANT_COUNT],
     pub sensor_b_hz: [Option<f32>; PLANT_COUNT],
+    pub sensor_a_build_minutes: [Option<u32>; PLANT_COUNT],
+    pub sensor_b_build_minutes: [Option<u32>; PLANT_COUNT],
 }
 
+/// Request: which sensors to send IDENTIFY_CMD to.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default, Serialize, Deserialize)]
+pub struct DetectionRequest {
+    pub plant: [SensorRequest; PLANT_COUNT],
+}
+
+/// Per-sensor portion of a detection request.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default, Serialize, Deserialize)]
+pub struct SensorRequest {
+    pub sensor_a: bool,
+    pub sensor_b: bool,
+}
+
+/// Response: detection result per plant.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Default, Serialize, Deserialize)]
 pub struct Detection {
-    plant: [DetectionSensorResult; PLANT_COUNT],
+    pub plant: [DetectionSensorResult; PLANT_COUNT],
 }
+
+/// Per-sensor detection result.
+/// `Some(build_minutes)` = sensor responded; value is its firmware build timestamp
+/// (minutes since Unix epoch, or 0 if not reported). `None` = not detected.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Default, Serialize, Deserialize)]
 pub struct DetectionSensorResult {
-    sensor_a: bool,
-    sensor_b: bool,
+    pub sensor_a: Option<u32>,
+    pub sensor_b: Option<u32>,
 }
diff --git a/Software/MainBoard/rust/src/hal/rtc.rs b/Software/MainBoard/rust/src/hal/rtc.rs
index 223f2af..5efd271 100644
--- a/Software/MainBoard/rust/src/hal/rtc.rs
+++ b/Software/MainBoard/rust/src/hal/rtc.rs
@@ -1,8 +1,6 @@
 use crate::fat_error::FatResult;
 use crate::hal::Box;
 use async_trait::async_trait;
-use bincode::config::Configuration;
-use bincode::{config, Decode, Encode};
 use chrono::{DateTime, Utc};
 use ds323x::ic::DS3231;
 use ds323x::interface::I2cInterface;
@@ -19,24 +17,21 @@ use esp_hal::Blocking;
 use serde::{Deserialize, Serialize};
 
 pub const X25: crc::Crc<u16> = crc::Crc::<u16>::new(&crc::CRC_16_IBM_SDLC);
-const CONFIG: Configuration = config::standard();
+pub const EEPROM_PAGE: usize = 32;
 //
 #[async_trait(?Send)]
 pub trait RTCModuleInteraction {
-    async fn get_backup_info(&mut self) -> FatResult<BackupHeader>;
-    async fn get_backup_config(&mut self, chunk: usize) -> FatResult<([u8; 32], usize, u16)>;
-    async fn backup_config(&mut self, offset: usize, bytes: &[u8]) -> FatResult<()>;
-    async fn backup_config_finalize(&mut self, crc: u16, length: usize) -> FatResult<()>;
     async fn get_rtc_time(&mut self) -> FatResult<DateTime<Utc>>;
     async fn set_rtc_time(&mut self, time: &DateTime<Utc>) -> FatResult<()>;
-}
-//
-const BACKUP_HEADER_MAX_SIZE: usize = 64;
 
-#[derive(Serialize, Deserialize, PartialEq, Debug, Default, Encode, Decode)]
+    fn write(&mut self, offset: u32, data: &[u8]) -> FatResult<()>;
+    fn read(&mut self, offset: u32, data: &mut [u8]) -> FatResult<()>;
+}
+
+#[derive(Serialize, Deserialize, PartialEq, Debug, Default)]
 pub struct BackupHeader {
     pub timestamp: i64,
-    crc16: u16,
+    pub(crate) crc16: u16,
     pub size: u16,
 }
 //
@@ -46,7 +41,7 @@ pub struct DS3231Module {
         DS3231,
     >,
 
-    pub(crate) storage: eeprom24x::Storage<
+    pub storage: eeprom24x::Storage<
         I2cDevice<'static, CriticalSectionRawMutex, I2c<'static, Blocking>>,
         B32,
         TwoBytes,
@@ -57,67 +52,6 @@ pub struct DS3231Module {
 
 #[async_trait(?Send)]
 impl RTCModuleInteraction for DS3231Module {
-    async fn get_backup_info(&mut self) -> FatResult<BackupHeader> {
-        let mut header_page_buffer = [0_u8; BACKUP_HEADER_MAX_SIZE];
-
-        self.storage.read(0, &mut header_page_buffer)?;
-
-        let (header, len): (BackupHeader, usize) =
-            bincode::decode_from_slice(&header_page_buffer[..], CONFIG)?;
-
-        log::info!("Raw header is {header_page_buffer:?} with size {len}");
-        Ok(header)
-    }
-
-    async fn get_backup_config(&mut self, chunk: usize) -> FatResult<([u8; 32], usize, u16)> {
-        let mut header_page_buffer = [0_u8; BACKUP_HEADER_MAX_SIZE];
-
-        self.storage.read(0, &mut header_page_buffer)?;
-        let (header, _header_size): (BackupHeader, usize) =
-            bincode::decode_from_slice(&header_page_buffer[..], CONFIG)?;
-
-        let mut buf = [0_u8; 32];
-        let offset = chunk * buf.len() + BACKUP_HEADER_MAX_SIZE;
-
-        let end: usize = header.size as usize + BACKUP_HEADER_MAX_SIZE;
-        let current_end = offset + buf.len();
-        let chunk_size = if current_end > end {
-            end - offset
-        } else {
-            buf.len()
-        };
-        if chunk_size == 0 {
-            Ok((buf, 0, header.crc16))
-        } else {
-            self.storage.read(offset as u32, &mut buf)?;
-            //&buf[..chunk_size];
-            Ok((buf, chunk_size, header.crc16))
-        }
-    }
-    async fn backup_config(&mut self, offset: usize, bytes: &[u8]) -> FatResult<()> {
-        //skip header and write after
-        self.storage
-            .write((BACKUP_HEADER_MAX_SIZE + offset) as u32, bytes)?;
-
-        Ok(())
-    }
-
-    async fn backup_config_finalize(&mut self, crc: u16, length: usize) -> FatResult<()> {
-        let mut header_page_buffer = [0_u8; BACKUP_HEADER_MAX_SIZE];
-
-        let time = self.get_rtc_time().await?.timestamp_millis();
-        let header = BackupHeader {
-            crc16: crc,
-            timestamp: time,
-            size: length as u16,
-        };
-        let config = config::standard();
-        let encoded = bincode::encode_into_slice(&header, &mut header_page_buffer, config)?;
-        log::info!("Raw header is {header_page_buffer:?} with size {encoded}");
-        self.storage.write(0, &header_page_buffer)?;
-        Ok(())
-    }
-
     async fn get_rtc_time(&mut self) -> FatResult<DateTime<Utc>> {
         Ok(self.rtc.datetime()?.and_utc())
     }
@@ -126,4 +60,14 @@ impl RTCModuleInteraction for DS3231Module {
         let naive_time = time.naive_utc();
         Ok(self.rtc.set_datetime(&naive_time)?)
     }
+
+    fn write(&mut self, offset: u32, data: &[u8]) -> FatResult<()> {
+        self.storage.write(offset, data)?;
+        Ok(())
+    }
+
+    fn read(&mut self, offset: u32, data: &mut [u8]) -> FatResult<()> {
+        self.storage.read(offset, data)?;
+        Ok(())
+    }
 }
diff --git a/Software/MainBoard/rust/src/hal/savegame_manager.rs b/Software/MainBoard/rust/src/hal/savegame_manager.rs
new file mode 100644
index 0000000..4d1c5b8
--- /dev/null
+++ b/Software/MainBoard/rust/src/hal/savegame_manager.rs
@@ -0,0 +1,265 @@
+use alloc::string::ToString;
+use alloc::vec::Vec;
+use embedded_savegame::storage::{Flash, Storage};
+use embedded_storage::nor_flash::{NorFlash, ReadNorFlash};
+use esp_bootloader_esp_idf::partitions::{Error as PartitionError, FlashRegion};
+use log::{error, info};
+use serde::Serialize;
+
+use crate::fat_error::{FatError, FatResult};
+use crate::hal::shared_flash::MutexFlashStorage;
+
+/// Size of each save slot in bytes (16 KB).
+pub const SAVEGAME_SLOT_SIZE: usize = 16384;
+//keep a little of space at the end due to partition table offsets
+const SAFETY: usize = 5;
+/// Number of slots in the 8 MB storage partition.
+pub const SAVEGAME_SLOT_COUNT: usize = (8 * 1024 * 1024) / SAVEGAME_SLOT_SIZE - SAFETY; // 507
+
+/// Metadata about a single existing save slot, returned by [`SavegameManager::list_saves`].
+#[derive(Serialize, Debug, Clone)]
+pub struct SaveInfo {
+    pub idx: usize,
+    pub len: u32,
+    /// UTC timestamp in RFC3339 format when the save was created
+    pub created_at: Option<alloc::string::String>,
+}
+
+const SAVE_MAGIC: [u8; 4] = *b"SGM1";
+const SAVE_HEADER_LEN: usize = 6; // magic (4) + timestamp_len (u16)
+
+struct ParsedSave<'a> {
+    created_at: &'a str,
+    data: &'a [u8],
+}
+
+fn strip_padding(data: &[u8]) -> &[u8] {
+    let mut end = data.len();
+    while end > 0 {
+        let b = data[end - 1];
+        if b == 0x00 || b == 0xFF {
+            end -= 1;
+        } else {
+            break;
+        }
+    }
+    &data[..end]
+}
+
+fn parse_save(data: &[u8]) -> FatResult<ParsedSave<'_>> {
+    if data.len() < SAVE_HEADER_LEN {
+        return Err(FatError::String {
+            error: "Save payload too short".into(),
+        });
+    }
+    if data[..4] != SAVE_MAGIC {
+        return Err(FatError::String {
+            error: "Save payload has invalid magic".into(),
+        });
+    }
+
+    let timestamp_len = u16::from_le_bytes([data[4], data[5]]) as usize;
+    let timestamp_end = SAVE_HEADER_LEN + timestamp_len;
+    if timestamp_end > data.len() {
+        return Err(FatError::String {
+            error: "Save payload timestamp length exceeds data".into(),
+        });
+    }
+
+    let created_at = core::str::from_utf8(&data[SAVE_HEADER_LEN..timestamp_end]).map_err(|e| {
+        FatError::String {
+            error: alloc::format!("Save payload contains invalid timestamp UTF-8: {e:?}"),
+        }
+    })?;
+
+    Ok(ParsedSave {
+        created_at,
+        data: strip_padding(&data[timestamp_end..]),
+    })
+}
+
+// ── Flash adapter ──────────────────────────────────────────────────────────────
+
+/// Newtype wrapper around a [`PartitionError`] so we can implement the
+/// [`core::fmt::Debug`] bound required by [`embedded_savegame::storage::Flash`].
+#[derive(Debug)]
+pub struct SavegameFlashError(#[allow(dead_code)] PartitionError);
+
+/// Adapts a `&mut FlashRegion<'static, MutexFlashStorage>` to the
+/// [`embedded_savegame::storage::Flash`] trait.
+///
+/// `erase(addr)` erases exactly one slot (`SAVEGAME_SLOT_SIZE` bytes) starting
+/// at `addr`, which is what embedded-savegame expects for NOR flash.
+pub struct SavegameFlashAdapter<'a> {
+    region: &'a mut FlashRegion<'static, MutexFlashStorage>,
+}
+
+impl Flash for SavegameFlashAdapter<'_> {
+    type Error = SavegameFlashError;
+
+    fn read(&mut self, addr: u32, buf: &mut [u8]) -> Result<(), Self::Error> {
+        ReadNorFlash::read(self.region, addr, buf).map_err(SavegameFlashError)
+    }
+
+    fn write(&mut self, addr: u32, data: &mut [u8]) -> Result<(), Self::Error> {
+        info!(
+            "Relative writing to flash at 0x{:x} with length {}",
+            addr,
+            data.len()
+        );
+        let error = NorFlash::write(self.region, addr, data);
+        if let Err(err) = error {
+            error!("error {:?}", err);
+        }
+        error.map_err(SavegameFlashError)
+    }
+
+    /// Erase one full slot at `addr`.
+    /// embedded-savegame calls this before writing to a slot, so we erase
+    /// the entire `SAVEGAME_SLOT_SIZE` bytes so subsequent writes land on
+    /// pre-erased (0xFF) pages.
+    /// Ensures addresses are aligned to ERASE_SIZE (4KB) boundaries.
+    fn erase(&mut self, addr: u32) -> Result<(), Self::Error> {
+        const ERASE_SIZE: u32 = 4096;
+        // Align start address down to erase boundary
+        let aligned_start = (addr / ERASE_SIZE) * ERASE_SIZE;
+        // Align end address up to erase boundary
+        let end = addr + SAVEGAME_SLOT_SIZE as u32;
+        let aligned_end = end.div_ceil(ERASE_SIZE) * ERASE_SIZE;
+
+        info!(
+            "Relative erasing flash at 0x{:x} (aligned to 0x{:x}-0x{:x})",
+            addr, aligned_start, aligned_end
+        );
+
+        if aligned_start != addr || aligned_end != end {
+            log::warn!("Flash erase address not aligned: addr=0x{:x}, slot_size=0x{:x}. Aligned to 0x{:x}-0x{:x}", addr, SAVEGAME_SLOT_SIZE, aligned_start, aligned_end);
+        }
+
+        match NorFlash::erase(self.region, aligned_start, aligned_end) {
+            Ok(_) => Ok(()),
+            Err(err) => {
+                error!(
+                    "Flash erase failed: {:?}. 0x{:x}-0x{:x}",
+                    err, aligned_start, aligned_end
+                );
+                Err(SavegameFlashError(err))
+            }
+        }
+    }
+}
+
+impl From<SavegameFlashError> for FatError {
+    fn from(e: SavegameFlashError) -> Self {
+        FatError::String {
+            error: alloc::format!("Savegame flash error: {:?}", e),
+        }
+    }
+}
+
+// ── SavegameManager ────────────────────────────────────────────────────────────
+
+/// High-level save-game manager that stores JSON config blobs on the storage
+/// partition using [`embedded_savegame`] for wear leveling and power-fail safety.
+pub struct SavegameManager {
+    storage: Storage<SavegameFlashAdapter<'static>, SAVEGAME_SLOT_SIZE, SAVEGAME_SLOT_COUNT>,
+}
+
+impl SavegameManager {
+    pub fn new(region: &'static mut FlashRegion<'static, MutexFlashStorage>) -> Self {
+        Self {
+            storage: Storage::new(SavegameFlashAdapter { region }),
+        }
+    }
+
+    /// Persist `data` (JSON bytes) to the next available slot with a UTC timestamp.
+    ///
+    /// `scan()` advances the internal wear-leveling pointer to the latest valid
+    /// slot before `append()` writes to the next free one.
+    /// Both operations are performed atomically on the same Storage instance.
+    pub fn save(&mut self, data: &[u8], timestamp: &str) -> FatResult<()> {
+        let timestamp_bytes = timestamp.as_bytes();
+        let timestamp_len: u16 =
+            timestamp_bytes
+                .len()
+                .try_into()
+                .map_err(|_| FatError::String {
+                    error: "Timestamp too long for save header".into(),
+                })?;
+
+        let mut serialized =
+            Vec::with_capacity(SAVE_HEADER_LEN + timestamp_bytes.len() + data.len());
+        serialized.extend_from_slice(&SAVE_MAGIC);
+        serialized.extend_from_slice(&timestamp_len.to_le_bytes());
+        serialized.extend_from_slice(timestamp_bytes);
+        serialized.extend_from_slice(data);
+
+        // Flash storage often requires length to be a multiple of 4.
+        let padding = (4 - (serialized.len() % 4)) % 4;
+        if padding > 0 {
+            serialized.extend_from_slice(&[0u8; 4][..padding]);
+        }
+
+        info!("Serialized config with size {} (padded)", serialized.len());
+        self.storage.append(&mut serialized)?;
+        Ok(())
+    }
+
+    /// Load the most recently saved data.  Returns `None` if no valid save exists.
+    /// Unwraps the SaveWrapper and returns only the config data.
+    pub fn load_latest(&mut self) -> FatResult<Option<Vec<u8>>> {
+        let slot = self.storage.scan()?;
+        match slot {
+            None => Ok(None),
+            Some(slot) => self.load_slot(slot.idx),
+        }
+    }
+
+    /// Load a specific save by slot index.  Returns `None` if the slot is
+    /// empty or contains an invalid checksum.
+    /// Unwraps the SaveWrapper and returns only the config data.
+    pub fn load_slot(&mut self, idx: usize) -> FatResult<Option<Vec<u8>>> {
+        let mut buf = alloc::vec![0u8; SAVEGAME_SLOT_SIZE];
+        match self.storage.read(idx, &mut buf)? {
+            None => Ok(None),
+            Some(data) => {
+                let parsed = parse_save(data)?;
+                Ok(Some(parsed.data.to_vec()))
+            }
+        }
+    }
+
+    /// Erase a specific slot by index, effectively deleting it.
+    pub fn delete_slot(&mut self, idx: usize) -> FatResult<()> {
+        self.storage.erase(idx).map_err(Into::into)
+    }
+
+    /// Iterate all slots and return metadata for every slot that contains a
+    /// valid save, using the Storage read API to avoid assuming internal slot structure.
+    /// Extracts timestamps from SaveWrapper if available.
+    pub fn list_saves(&mut self) -> FatResult<Vec<SaveInfo>> {
+        let mut saves = Vec::new();
+        let mut buf = alloc::vec![0u8; SAVEGAME_SLOT_SIZE];
+        for idx in 0..SAVEGAME_SLOT_COUNT {
+            if let Some(data) = self.storage.read(idx, &mut buf)? {
+                match parse_save(data) {
+                    Ok(save) => {
+                        saves.push(SaveInfo {
+                            idx,
+                            len: save.data.len() as u32,
+                            created_at: Some(alloc::string::String::from(save.created_at)),
+                        });
+                    }
+                    Err(err) => {
+                        saves.push(SaveInfo {
+                            idx,
+                            len: 0,
+                            created_at: Some(err.to_string()),
+                        });
+                    }
+                }
+            }
+        }
+        Ok(saves)
+    }
+}
diff --git a/Software/MainBoard/rust/src/hal/v4_hal.rs b/Software/MainBoard/rust/src/hal/v4_hal.rs
index 9181e83..3ba5654 100644
--- a/Software/MainBoard/rust/src/hal/v4_hal.rs
+++ b/Software/MainBoard/rust/src/hal/v4_hal.rs
@@ -3,18 +3,20 @@ use crate::config::PlantControllerConfig;
 use crate::fat_error::{ContextExt, FatError, FatResult};
 use crate::hal::battery::BatteryInteraction;
 use crate::hal::esp::{hold_disable, hold_enable, Esp};
-use crate::hal::rtc::RTCModuleInteraction;
+use crate::hal::rtc::{BackupHeader, RTCModuleInteraction, EEPROM_PAGE, X25};
 use crate::hal::water::TankSensor;
 use crate::hal::{
-    BoardInteraction, Detection, FreePeripherals, Moistures, Sensor, I2C_DRIVER, PLANT_COUNT,
-    TIME_ACCESS,
+    BoardInteraction, Detection, DetectionRequest, FreePeripherals, Moistures, Sensor, I2C_DRIVER,
+    PLANT_COUNT,
 };
-use crate::log::{LogMessage, LOG_ACCESS};
+use crate::log::{log, LogMessage};
 use alloc::boxed::Box;
 use alloc::string::ToString;
 use async_trait::async_trait;
 use canapi::id::{classify, plant_id, MessageKind, IDENTIFY_CMD_OFFSET};
 use canapi::SensorSlot;
+use chrono::{DateTime, FixedOffset, Utc};
+use core::cmp::min;
 use embassy_embedded_hal::shared_bus::blocking::i2c::I2cDevice;
 use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
 use embassy_time::{Duration, Timer, WithTimeout};
@@ -30,8 +32,11 @@ use ina219::SyncIna219;
 use log::{error, info, warn};
 use measurements::Resistance;
 use measurements::{Current, Voltage};
+// use no_panic::no_panic;
 use pca9535::{GPIOBank, Pca9535Immediate, StandardExpanderInterface};
 
+pub const BACKUP_HEADER_MAX_SIZE: usize = 64;
+
 const MPPT_CURRENT_SHUNT_OHMS: f64 = 0.05_f64;
 const TWAI_BAUDRATE: twai::BaudRate = twai::BaudRate::Custom(twai::TimingConfig {
     baud_rate_prescaler: 200, // 40MHz / 200 * 2 = 100 on C6, 100 * 20 = 2000 divisor, 40MHz / 2000 = 20kHz
@@ -139,6 +144,11 @@ pub struct V4<'a> {
     extra1: Output<'a>,
     extra2: Output<'a>,
     twai_config: Option<TwaiConfiguration<'static, Blocking>>,
+
+    /// Last known firmware build timestamps per sensor (minutes since Unix epoch).
+    /// Updated during detect_sensors; preserved across normal measurement cycles.
+    sensor_a_build_minutes: [Option<u32>; PLANT_COUNT],
+    sensor_b_build_minutes: [Option<u32>; PLANT_COUNT],
 }
 
 pub(crate) async fn create_v4(
@@ -268,6 +278,8 @@ pub(crate) async fn create_v4(
         extra2,
         can_power,
         twai_config,
+        sensor_a_build_minutes: [None; PLANT_COUNT],
+        sensor_b_build_minutes: [None; PLANT_COUNT],
     };
     Ok(Box::new(v))
 }
@@ -294,15 +306,24 @@ impl<'a> BoardInteraction<'a> for V4<'a> {
         &mut self.rtc_module
     }
 
+    async fn get_time(&mut self) -> DateTime<Utc> {
+        self.esp.get_time()
+    }
+
+    async fn set_time(&mut self, time: &DateTime<FixedOffset>) -> FatResult<()> {
+        self.rtc_module.set_rtc_time(&time.to_utc()).await?;
+        self.esp.set_time(time.to_utc());
+        Ok(())
+    }
+
     async fn set_charge_indicator(&mut self, charging: bool) -> Result<(), FatError> {
         self.charger.set_charge_indicator(charging)
     }
 
-    async fn deep_sleep(&mut self, duration_in_ms: u64) -> ! {
+    async fn deep_sleep_ms(&mut self, duration_in_ms: u64) -> ! {
         self.awake.set_low();
         self.charger.power_save();
-        let rtc = TIME_ACCESS.get().await.lock().await;
-        self.esp.deep_sleep(duration_in_ms, rtc);
+        self.esp.deep_sleep(duration_in_ms);
     }
 
     fn is_day(&self) -> bool {
@@ -334,19 +355,11 @@ impl<'a> BoardInteraction<'a> for V4<'a> {
                 bail!("pump current sensor not available");
             }
             Some(pump_ina) => {
-                let v = pump_ina
-                    .shunt_voltage()
-                    .map_err(|e| FatError::String {
-                        error: alloc::format!("{e:?}"),
-                    })
-                    .map(|v| {
-                        let shunt_voltage =
-                            Voltage::from_microvolts(v.shunt_voltage_uv().abs() as f64);
-                        let shut_value = Resistance::from_ohms(0.05_f64);
-                        let current = shunt_voltage.as_volts() / shut_value.as_ohms();
-                        Current::from_amperes(current)
-                    })?;
-                Ok(v)
+                let raw = pump_ina.shunt_voltage()?;
+                let shunt_voltage = Voltage::from_microvolts(raw.shunt_voltage_uv().abs() as f64);
+                let shut_value = Resistance::from_ohms(0.05_f64);
+                let current = shunt_voltage.as_volts() / shut_value.as_ohms();
+                Ok(Current::from_amperes(current))
             }
         }
     }
@@ -364,7 +377,7 @@ impl<'a> BoardInteraction<'a> for V4<'a> {
     async fn measure_moisture_hz(&mut self) -> FatResult<Moistures> {
         self.can_power.set_high();
         Timer::after_millis(500).await;
-        let config = self.twai_config.take().expect("twai config not set");
+        let config = self.twai_config.take().context("twai config not set")?;
         let mut twai = config.into_async().start();
 
         if twai.is_bus_off() {
@@ -388,13 +401,175 @@ impl<'a> BoardInteraction<'a> for V4<'a> {
         self.twai_config.replace(config);
         self.can_power.set_low();
 
+        // Persist any firmware build timestamps received alongside moisture data.
+        if let Ok(ref moistures) = res {
+            for (i, v) in moistures.sensor_a_build_minutes.iter().enumerate() {
+                if v.is_some() {
+                    self.sensor_a_build_minutes[i] = *v;
+                }
+            }
+            for (i, v) in moistures.sensor_b_build_minutes.iter().enumerate() {
+                if v.is_some() {
+                    self.sensor_b_build_minutes[i] = *v;
+                }
+            }
+        }
+
         res
     }
 
-    async fn detect_sensors(&mut self, request: Detection) -> FatResult<Detection> {
+    async fn general_fault(&mut self, enable: bool) {
+        hold_disable(23);
+        self.general_fault.set_level(enable.into());
+        hold_enable(23);
+    }
+
+    async fn test(&mut self) -> Result<(), FatError> {
+        self.general_fault(true).await;
+        Timer::after_millis(100).await;
+        self.general_fault(false).await;
+        Timer::after_millis(500).await;
+        self.extra1.set_high();
+        Timer::after_millis(500).await;
+        self.extra1.set_low();
+        Timer::after_millis(500).await;
+        self.extra2.set_high();
+        Timer::after_millis(500).await;
+        self.extra2.set_low();
+        Timer::after_millis(500).await;
+        self.light(true).await?;
+        Timer::after_millis(500).await;
+        self.light(false).await?;
+        Timer::after_millis(500).await;
+        for i in 0..PLANT_COUNT {
+            self.fault(i, true).await?;
+            Timer::after_millis(500).await;
+            self.fault(i, false).await?;
+            Timer::after_millis(500).await;
+        }
+        for i in 0..PLANT_COUNT {
+            self.pump(i, true).await?;
+            Timer::after_millis(100).await;
+            self.pump(i, false).await?;
+            Timer::after_millis(100).await;
+        }
+        let moisture = self.measure_moisture_hz().await?;
+        for plant in 0..PLANT_COUNT {
+            let a = moisture.sensor_a_hz[plant].unwrap_or(0.0) as u32;
+            let b = moisture.sensor_b_hz[plant].unwrap_or(0.0) as u32;
+            log(LogMessage::TestSensor, a, b, &(plant + 1).to_string(), "");
+        }
+        Timer::after_millis(10).await;
+        Ok(())
+    }
+
+    fn set_config(&mut self, config: PlantControllerConfig) {
+        self.config = config;
+    }
+
+    async fn get_mptt_voltage(&mut self) -> FatResult<Voltage> {
+        self.charger.get_mptt_voltage()
+    }
+
+    async fn get_mptt_current(&mut self) -> FatResult<Current> {
+        self.charger.get_mppt_current()
+    }
+
+    async fn can_power(&mut self, state: bool) -> FatResult<()> {
+        if state && self.can_power.is_set_low() {
+            self.can_power.set_high();
+        } else {
+            self.can_power.set_low();
+        }
+        Ok(())
+    }
+
+    async fn fertilizer_pump(&mut self, enable: bool) -> FatResult<()> {
+        if enable {
+            self.extra2.set_high();
+        } else {
+            self.extra2.set_low();
+        }
+        Ok(())
+    }
+
+    async fn backup_config(&mut self, controller_config: &PlantControllerConfig) -> FatResult<()> {
+        let mut buffer: [u8; 4096 - BACKUP_HEADER_MAX_SIZE] = [0; 4096 - BACKUP_HEADER_MAX_SIZE];
+        let length = postcard::to_slice(controller_config, &mut buffer)?.len();
+        info!("Writing backup config of size {}", length);
+        let mut checksum = X25.digest();
+        checksum.update(&buffer[..length]);
+        let mut header_page_buffer = [0_u8; BACKUP_HEADER_MAX_SIZE];
+
+        let time = self.rtc_module.get_rtc_time().await?.timestamp_millis();
+        let header = BackupHeader {
+            crc16: checksum.finalize(),
+            timestamp: time,
+            size: length as u16,
+        };
+        info!("Header is {:?}", header);
+        postcard::to_slice(&header, &mut header_page_buffer)?;
+        info!("Header is serialized");
+        self.get_rtc_module().write(0, &header_page_buffer)?;
+        info!("Header written");
+        let mut to_write = length;
+        let mut chunk: usize = 0;
+
+        while to_write > 0 {
+            self.progress(chunk as u32).await;
+            let start = chunk * EEPROM_PAGE;
+            let end = start + min(EEPROM_PAGE, to_write);
+            let part = &buffer[start..end];
+            info!(
+                "Writing chunk {} of size {} to offset {}",
+                chunk,
+                part.len(),
+                start
+            );
+            to_write -= part.len();
+            self.get_rtc_module()
+                .write((BACKUP_HEADER_MAX_SIZE + chunk * EEPROM_PAGE) as u32, part)?;
+            chunk += 1;
+        }
+        info!("Backup complete");
+        self.clear_progress().await;
+        Ok(())
+    }
+    async fn read_backup(&mut self) -> FatResult<PlantControllerConfig> {
+        let info = self.backup_info().await?;
+        let mut store = alloc::vec![0_u8; info.size as usize];
+        self.rtc_module
+            .read(BACKUP_HEADER_MAX_SIZE as u32, store.as_mut_slice())?;
+        info!("Read backup data of size {}", store.len());
+        let mut checksum = X25.digest();
+        info!("Calculating CRC");
+        checksum.update(&store[..]);
+        let crc = checksum.finalize();
+        info!("CRC is {:04x}", crc);
+        if crc != info.crc16 {
+            warn!("CRC mismatch in backup data");
+            bail!("CRC mismatch in backup data")
+        }
+        info!("CRC is correct");
+        let decoded = postcard::from_bytes(&store[..])?;
+        info!("Backup data decoded");
+        Ok(decoded)
+    }
+
+    async fn backup_info(&mut self) -> FatResult<BackupHeader> {
+        let mut header_page_buffer = [0_u8; BACKUP_HEADER_MAX_SIZE];
+        self.get_rtc_module().read(0, &mut header_page_buffer)?;
+        info!("Read header page");
+        let info = postcard::take_from_bytes::<BackupHeader>(&header_page_buffer[..]);
+        info!("decoding header: {:?}", info);
+        let (header, _) = info.context("Could not read backup header")?;
+        Ok(header)
+    }
+
+    async fn detect_sensors(&mut self, request: DetectionRequest) -> FatResult<Detection> {
         self.can_power.set_high();
         Timer::after_millis(500).await;
-        let config = self.twai_config.take().expect("twai config not set");
+        let config = self.twai_config.take().context("twai config not set")?;
         let mut twai = config.into_async().start();
 
         if twai.is_bus_off() {
@@ -414,6 +589,7 @@ impl<'a> BoardInteraction<'a> for V4<'a> {
                     } else {
                         request.plant[plant].sensor_b
                     };
+
                     if !detect {
                         continue;
                     }
@@ -458,7 +634,7 @@ impl<'a> BoardInteraction<'a> for V4<'a> {
             let result: Detection = moistures.into();
 
             info!("Autodetection result: {result:?}");
-            Ok(result)
+            Ok((result, moistures.sensor_a_build_minutes, moistures.sensor_b_build_minutes))
         })
         .await;
 
@@ -466,77 +642,18 @@ impl<'a> BoardInteraction<'a> for V4<'a> {
         self.twai_config.replace(config);
         self.can_power.set_low();
 
-        res
-    }
-
-    async fn general_fault(&mut self, enable: bool) {
-        hold_disable(23);
-        self.general_fault.set_level(enable.into());
-        hold_enable(23);
-    }
-
-    async fn test(&mut self) -> Result<(), FatError> {
-        self.general_fault(true).await;
-        Timer::after_millis(100).await;
-        self.general_fault(false).await;
-        Timer::after_millis(500).await;
-        self.extra1.set_high();
-        Timer::after_millis(500).await;
-        self.extra1.set_low();
-        Timer::after_millis(500).await;
-        self.extra2.set_high();
-        Timer::after_millis(500).await;
-        self.extra2.set_low();
-        Timer::after_millis(500).await;
-        self.light(true).await?;
-        Timer::after_millis(500).await;
-        self.light(false).await?;
-        Timer::after_millis(500).await;
-        for i in 0..PLANT_COUNT {
-            self.fault(i, true).await?;
-            Timer::after_millis(500).await;
-            self.fault(i, false).await?;
-            Timer::after_millis(500).await;
+        match res {
+            Ok((detection, a_builds, b_builds)) => {
+                self.sensor_a_build_minutes = a_builds;
+                self.sensor_b_build_minutes = b_builds;
+                Ok(detection)
+            }
+            Err(e) => Err(e),
         }
-        for i in 0..PLANT_COUNT {
-            self.pump(i, true).await?;
-            Timer::after_millis(100).await;
-            self.pump(i, false).await?;
-            Timer::after_millis(100).await;
-        }
-        let moisture = self.measure_moisture_hz().await?;
-        for plant in 0..PLANT_COUNT {
-            let a = moisture.sensor_a_hz[plant].unwrap_or(0.0) as u32;
-            let b = moisture.sensor_b_hz[plant].unwrap_or(0.0) as u32;
-            LOG_ACCESS
-                .lock()
-                .await
-                .log(LogMessage::TestSensor, a, b, &(plant + 1).to_string(), "")
-                .await;
-        }
-        Timer::after_millis(10).await;
-        Ok(())
     }
 
-    fn set_config(&mut self, config: PlantControllerConfig) {
-        self.config = config;
-    }
-
-    async fn get_mptt_voltage(&mut self) -> FatResult<Voltage> {
-        self.charger.get_mptt_voltage()
-    }
-
-    async fn get_mptt_current(&mut self) -> FatResult<Current> {
-        self.charger.get_mppt_current()
-    }
-
-    async fn can_power(&mut self, state: bool) -> FatResult<()> {
-        if state && self.can_power.is_set_low() {
-            self.can_power.set_high();
-        } else {
-            self.can_power.set_low();
-        }
-        Ok(())
+    fn get_sensor_build_minutes(&self) -> ([Option<u32>; PLANT_COUNT], [Option<u32>; PLANT_COUNT]) {
+        (self.sensor_a_build_minutes, self.sensor_b_build_minutes)
     }
 }
 
@@ -557,10 +674,10 @@ async fn wait_for_can_measurements(
                                 "received message of kind {:?} (plant: {}, sensor: {:?})",
                                 msg.0, msg.1, msg.2
                             );
+                            let plant = msg.1 as usize;
+                            let sensor = msg.2;
+                            let data = can_frame.data();
                             if msg.0 == MessageKind::MoistureData {
-                                let plant = msg.1 as usize;
-                                let sensor = msg.2;
-                                let data = can_frame.data();
                                 info!("Received moisture data: {:?}", data);
                                 if let Ok(bytes) = data.try_into() {
                                     let frequency = u32::from_be_bytes(bytes);
@@ -577,6 +694,23 @@ async fn wait_for_can_measurements(
                                 } else {
                                     error!("Received moisture data with invalid length: {} (expected 4)", data.len());
                                 }
+                            } else if msg.0 == MessageKind::FirmwareBuild {
+                                info!("Received firmware build data: {:?}", data);
+                                if let Ok(bytes) = data.try_into() {
+                                    let build_minutes = u32::from_be_bytes(bytes);
+                                    match sensor {
+                                        SensorSlot::A => {
+                                            moistures.sensor_a_build_minutes[plant - 1] =
+                                                Some(build_minutes);
+                                        }
+                                        SensorSlot::B => {
+                                            moistures.sensor_b_build_minutes[plant - 1] =
+                                                Some(build_minutes);
+                                        }
+                                    }
+                                } else {
+                                    error!("Received firmware build data with invalid length: {} (expected 4)", data.len());
+                                }
                             }
                         }
                     }
@@ -603,10 +737,17 @@ impl From<Moistures> for Detection {
     fn from(value: Moistures) -> Self {
         let mut result = Detection::default();
         for (plant, sensor) in value.sensor_a_hz.iter().enumerate() {
-            result.plant[plant].sensor_a = sensor.is_some();
+            if sensor.is_some() {
+                // Sensor responded; include build timestamp (0 = timestamp not reported)
+                result.plant[plant].sensor_a =
+                    Some(value.sensor_a_build_minutes[plant].unwrap_or(0));
+            }
         }
         for (plant, sensor) in value.sensor_b_hz.iter().enumerate() {
-            result.plant[plant].sensor_b = sensor.is_some();
+            if sensor.is_some() {
+                result.plant[plant].sensor_b =
+                    Some(value.sensor_b_build_minutes[plant].unwrap_or(0));
+            }
         }
         result
     }
diff --git a/Software/MainBoard/rust/src/hal/water.rs b/Software/MainBoard/rust/src/hal/water.rs
index bdbb3b7..5f3b457 100644
--- a/Software/MainBoard/rust/src/hal/water.rs
+++ b/Software/MainBoard/rust/src/hal/water.rs
@@ -4,18 +4,20 @@ use crate::hal::{ADC1, TANK_MULTI_SAMPLE};
 use embassy_time::Timer;
 use esp_hal::analog::adc::{Adc, AdcCalLine, AdcConfig, AdcPin, Attenuation};
 use esp_hal::delay::Delay;
-use esp_hal::gpio::{Flex, Input, Output, OutputConfig, Pull};
+use esp_hal::gpio::{DriveMode, Flex, Input, InputConfig, Output, OutputConfig, Pull};
 use esp_hal::pcnt::channel::CtrlMode::Keep;
 use esp_hal::pcnt::channel::EdgeMode::{Hold, Increment};
 use esp_hal::pcnt::unit::Unit;
 use esp_hal::peripherals::GPIO5;
-use esp_hal::Blocking;
+use esp_hal::Async;
 use esp_println::println;
 use onewire::{ds18b20, Device, DeviceSearch, OneWire, DS18B20};
 
+unsafe impl Send for TankSensor<'_> {}
+
 pub struct TankSensor<'a> {
     one_wire_bus: OneWire<Flex<'a>>,
-    tank_channel: Adc<'a, ADC1<'a>, Blocking>,
+    tank_channel: Adc<'a, ADC1<'a>, Async>,
     tank_power: Output<'a>,
     tank_pin: AdcPin<GPIO5<'a>, ADC1<'a>, AdcCalLine<ADC1<'a>>>,
     flow_counter: Unit<'a, 1>,
@@ -30,11 +32,20 @@ impl<'a> TankSensor<'a> {
         flow_sensor: Input,
         pcnt1: Unit<'a, 1>,
     ) -> Result<TankSensor<'a>, FatError> {
-        one_wire_pin.apply_output_config(&OutputConfig::default().with_pull(Pull::None));
+        one_wire_pin.apply_output_config(
+            &OutputConfig::default()
+                .with_drive_mode(DriveMode::OpenDrain)
+                .with_pull(Pull::None),
+        );
+        one_wire_pin.apply_input_config(&InputConfig::default().with_pull(Pull::None));
+        one_wire_pin.set_high();
+        one_wire_pin.set_input_enable(true);
+        one_wire_pin.set_output_enable(true);
 
         let mut adc1_config = AdcConfig::new();
-        let tank_pin = adc1_config.enable_pin_with_cal::<_, AdcCalLine<_>>(gpio5, Attenuation::_11dB);
-        let tank_channel = Adc::new(adc1, adc1_config);
+        let tank_pin =
+            adc1_config.enable_pin_with_cal::<_, AdcCalLine<_>>(gpio5, Attenuation::_11dB);
+        let tank_channel = Adc::new(adc1, adc1_config).into_async();
 
         let one_wire_bus = OneWire::new(one_wire_pin, false);
 
@@ -77,15 +88,33 @@ impl<'a> TankSensor<'a> {
         //multisample should be moved to water_temperature_c
         let mut attempt = 1;
         let mut delay = Delay::new();
-        self.one_wire_bus.reset(&mut delay)?;
+
+        let presence = self.one_wire_bus.reset(&mut delay)?;
+        println!("OneWire: reset presence pulse = {}", presence);
+        if !presence {
+            println!("OneWire: no device responded to reset — check pull-up resistor and wiring");
+        }
+
         let mut search = DeviceSearch::new();
         let mut water_temp_sensor: Option<Device> = None;
+        let mut devices_found = 0u8;
         while let Some(device) = self.one_wire_bus.search_next(&mut search, &mut delay)? {
+            devices_found += 1;
+            println!(
+                "OneWire: found device #{} family=0x{:02X} addr={:02X?}",
+                devices_found, device.address[0], device.address
+            );
             if device.address[0] == ds18b20::FAMILY_CODE {
                 water_temp_sensor = Some(device);
                 break;
+            } else {
+                println!("OneWire: skipping device — not a DS18B20 (family 0x{:02X} != 0x{:02X})", device.address[0], ds18b20::FAMILY_CODE);
             }
         }
+        if devices_found == 0 {
+            println!("OneWire: search found zero devices on the bus");
+        }
+
         match water_temp_sensor {
             Some(device) => {
                 println!("Found one wire device: {:?}", device);
@@ -138,15 +167,14 @@ impl<'a> TankSensor<'a> {
 
         let mut store = [0_u16; TANK_MULTI_SAMPLE];
         for sample in store.iter_mut() {
-            let value = self.tank_channel.read_oneshot(&mut self.tank_pin);
-            //force yield
+            *sample = self.tank_channel.read_oneshot(&mut self.tank_pin).await;
+            //force yield between successful samples
             Timer::after_millis(10).await;
-            *sample = value.unwrap();
         }
         self.tank_power.set_low();
 
         store.sort();
         let median_mv = store[TANK_MULTI_SAMPLE / 2] as f32;
-        Ok(median_mv/1000.0)
+        Ok(median_mv / 1000.0)
     }
 }
diff --git a/Software/MainBoard/rust/src/log/interceptor.rs b/Software/MainBoard/rust/src/log/interceptor.rs
new file mode 100644
index 0000000..adeb034
--- /dev/null
+++ b/Software/MainBoard/rust/src/log/interceptor.rs
@@ -0,0 +1,108 @@
+use alloc::string::String;
+use alloc::vec::Vec;
+use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
+use embassy_sync::blocking_mutex::Mutex as BlockingMutex;
+use log::{LevelFilter, Log, Metadata, Record};
+
+const MAX_LIVE_LOG_ENTRIES: usize = 64;
+
+struct LiveLogBuffer {
+    entries: Vec<(u64, String)>,
+    next_seq: u64,
+}
+
+impl LiveLogBuffer {
+    const fn new() -> Self {
+        Self {
+            entries: Vec::new(),
+            next_seq: 0,
+        }
+    }
+
+    fn push(&mut self, text: String) {
+        if self.entries.len() >= MAX_LIVE_LOG_ENTRIES {
+            self.entries.remove(0);
+        }
+        self.entries.push((self.next_seq, text));
+        self.next_seq += 1;
+    }
+
+    fn get_after(&self, after: Option<u64>) -> (Vec<(u64, String)>, bool, u64) {
+        let next_seq = self.next_seq;
+        match after {
+            None => (self.entries.clone(), false, next_seq),
+            Some(after_seq) => {
+                let result: Vec<_> = self.entries
+                    .iter()
+                    .filter(|(seq, _)| *seq > after_seq)
+                    .cloned()
+                    .collect();
+
+                // Dropped if there are entries that should exist (seq > after_seq) but
+                // the oldest retained entry has a higher seq than after_seq + 1.
+                let dropped = if next_seq > after_seq.saturating_add(1) {
+                    if let Some((oldest_seq, _)) = self.entries.first() {
+                        *oldest_seq > after_seq.saturating_add(1)
+                    } else {
+                        // Buffer empty but entries were written — all dropped
+                        true
+                    }
+                } else {
+                    false
+                };
+
+                (result, dropped, next_seq)
+            }
+        }
+    }
+}
+
+pub struct InterceptorLogger {
+    live_log: BlockingMutex<CriticalSectionRawMutex, core::cell::RefCell<LiveLogBuffer>>,
+}
+
+impl InterceptorLogger {
+    pub const fn new() -> Self {
+        Self {
+            live_log: BlockingMutex::new(core::cell::RefCell::new(LiveLogBuffer::new())),
+        }
+    }
+
+    /// Returns (entries_after, dropped, next_seq).
+    /// Pass `after = None` to retrieve the entire current buffer.
+    /// Pass `after = Some(seq)` to retrieve only entries with seq > that value.
+    pub fn get_live_logs(&self, after: Option<u64>) -> (Vec<(u64, String)>, bool, u64) {
+        self.live_log.lock(|buf| buf.borrow().get_after(after))
+    }
+
+    pub fn init(&'static self) {
+        match log::set_logger(self).map(|()| log::set_max_level(LevelFilter::Info)) {
+            Ok(()) => {}
+            Err(_e) => {
+                esp_println::println!("ERROR: Logger already set");
+            }
+        }
+    }
+}
+
+impl Log for InterceptorLogger {
+    fn enabled(&self, metadata: &Metadata) -> bool {
+        metadata.level() <= log::Level::Info
+    }
+
+    fn log(&self, record: &Record) {
+        if self.enabled(record.metadata()) {
+            let message = alloc::format!("{}: {}", record.level(), record.args());
+
+            // Print to serial
+            esp_println::println!("{}", message);
+
+            // Store in live log ring buffer
+            self.live_log.lock(|buf| {
+                buf.borrow_mut().push(message);
+            });
+        }
+    }
+
+    fn flush(&self) {}
+}
diff --git a/Software/MainBoard/rust/src/log/mod.rs b/Software/MainBoard/rust/src/log/mod.rs
index 5bf6828..a1df0dd 100644
--- a/Software/MainBoard/rust/src/log/mod.rs
+++ b/Software/MainBoard/rust/src/log/mod.rs
@@ -1,10 +1,11 @@
-use crate::hal::TIME_ACCESS;
 use crate::vec;
+use crate::BOARD_ACCESS;
 use alloc::string::ToString;
 use alloc::vec::Vec;
 use bytemuck::{AnyBitPattern, Pod, Zeroable};
 use deranged::RangedU8;
 use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
+use embassy_sync::channel::Channel;
 use embassy_sync::mutex::Mutex;
 use esp_hal::Persistable;
 use log::{info, warn};
@@ -32,6 +33,40 @@ static mut LOG_ARRAY: LogArray = LogArray {
 pub static LOG_ACCESS: Mutex<CriticalSectionRawMutex, &'static mut LogArray> =
     unsafe { Mutex::new(&mut LOG_ARRAY) };
 
+mod interceptor;
+
+pub use interceptor::InterceptorLogger;
+
+pub static INTERCEPTOR: InterceptorLogger = InterceptorLogger::new();
+
+pub struct LogRequest {
+    pub message_key: LogMessage,
+    pub number_a: u32,
+    pub number_b: u32,
+    pub txt_short: heapless::String<TXT_SHORT_LENGTH>,
+    pub txt_long: heapless::String<TXT_LONG_LENGTH>,
+}
+
+static LOG_CHANNEL: Channel<CriticalSectionRawMutex, LogRequest, 16> = Channel::new();
+
+#[embassy_executor::task]
+pub async fn log_task() {
+    loop {
+        let request = LOG_CHANNEL.receive().await;
+        LOG_ACCESS
+            .lock()
+            .await
+            .log(
+                request.message_key,
+                request.number_a,
+                request.number_b,
+                request.txt_short.as_str(),
+                request.txt_long.as_str(),
+            )
+            .await;
+    }
+}
+
 const TXT_SHORT_LENGTH: usize = 8;
 const TXT_LONG_LENGTH: usize = 32;
 
@@ -80,24 +115,31 @@ impl From<LogEntryInner> for LogEntry {
     }
 }
 
-pub async fn log(
-    message_key: LogMessage,
-    number_a: u32,
-    number_b: u32,
-    txt_short: &str,
-    txt_long: &str,
-) {
-    LOG_ACCESS
-        .lock()
-        .await
-        .log(message_key, number_a, number_b, txt_short, txt_long)
-        .await
+pub fn log(message_key: LogMessage, number_a: u32, number_b: u32, txt_short: &str, txt_long: &str) {
+    let mut txt_short_stack: heapless::String<TXT_SHORT_LENGTH> = heapless::String::new();
+    let mut txt_long_stack: heapless::String<TXT_LONG_LENGTH> = heapless::String::new();
+
+    limit_length(txt_short, &mut txt_short_stack);
+    limit_length(txt_long, &mut txt_long_stack);
+
+    match LOG_CHANNEL.try_send(LogRequest {
+        message_key,
+        number_a,
+        number_b,
+        txt_short: txt_short_stack,
+        txt_long: txt_long_stack,
+    }) {
+        Ok(_) => {}
+        Err(_) => {
+            warn!("Log channel full, dropping log entry");
+        }
+    }
 }
 
 impl LogArray {
     pub fn get(&mut self) -> Vec<LogEntry> {
         let head: RangedU8<0, MAX_LOG_ARRAY_INDEX> =
-            RangedU8::new(self.head).unwrap_or(RangedU8::new(0).unwrap());
+            RangedU8::new(self.head).unwrap_or(RangedU8::new_saturating(0));
 
         let mut rv: Vec<LogEntry> = Vec::new();
         let mut index = head.wrapping_sub(1);
@@ -120,17 +162,11 @@ impl LogArray {
         txt_long: &str,
     ) {
         let mut head: RangedU8<0, MAX_LOG_ARRAY_INDEX> =
-            RangedU8::new(self.head).unwrap_or(RangedU8::new(0).unwrap());
-
-        let mut txt_short_stack: heapless::String<TXT_SHORT_LENGTH> = heapless::String::new();
-        let mut txt_long_stack: heapless::String<TXT_LONG_LENGTH> = heapless::String::new();
-
-        limit_length(txt_short, &mut txt_short_stack);
-        limit_length(txt_long, &mut txt_long_stack);
+            RangedU8::new(self.head).unwrap_or(RangedU8::new_saturating(0));
 
         let time = {
-            let guard = TIME_ACCESS.get().await.lock().await;
-            guard.current_time_us()
+            let mut guard = BOARD_ACCESS.get().await.lock().await;
+            guard.board_hal.get_esp().rtc.current_time_us()
         } / 1000;
 
         let ordinal = message_key.ordinal() as u16;
@@ -148,12 +184,8 @@ impl LogArray {
         to_modify.message_id = ordinal;
         to_modify.a = number_a;
         to_modify.b = number_b;
-        to_modify
-            .txt_short
-            .clone_from_slice(txt_short_stack.as_bytes());
-        to_modify
-            .txt_long
-            .clone_from_slice(txt_long_stack.as_bytes());
+        to_modify.txt_short.clone_from_slice(txt_short.as_bytes());
+        to_modify.txt_long.clone_from_slice(txt_long.as_bytes());
         head = head.wrapping_add(1);
         self.head = head.get();
     }
@@ -279,8 +311,20 @@ pub enum LogMessage {
     PumpOpenLoopCurrent,
     #[strum(serialize = "Pump Open current sensor required but did not work: ${number_a}")]
     PumpMissingSensorCurrent,
+    #[strum(
+        serialize = "Fertilizer applied for ${number_a}s on plant ${number_b} (last application ${txt_short} minutes ago)"
+    )]
+    FertilizerApplied,
     #[strum(serialize = "MPPT Current sensor could not be reached")]
     MPPTError,
+    #[strum(
+        serialize = "Trace: a: ${number_a} b: ${number_b} txt_s ${txt_short} long ${txt_long}"
+    )]
+    Trace,
+    #[strum(serialize = "Parsing error reading message")]
+    UnknownMessage,
+    #[strum(serialize = "Going to deep sleep for ${number_a} minutes")]
+    DeepSleep,
 }
 
 #[derive(Serialize)]
@@ -301,7 +345,7 @@ impl From<&LogMessage> for MessageTranslation {
 impl LogMessage {
     pub fn log_localisation_config() -> Vec<MessageTranslation> {
         Vec::from_iter((0..LogMessage::len()).map(|i| {
-            let msg_type = LogMessage::from_ordinal(i).unwrap();
+            let msg_type = LogMessage::from_ordinal(i).unwrap_or(LogMessage::UnknownMessage);
             (&msg_type).into()
         }))
     }
diff --git a/Software/MainBoard/rust/src/main.rs b/Software/MainBoard/rust/src/main.rs
index 22482a8..663a5ae 100644
--- a/Software/MainBoard/rust/src/main.rs
+++ b/Software/MainBoard/rust/src/main.rs
@@ -8,6 +8,7 @@
     reason = "mem::forget is generally not safe to do with esp_hal types, especially those \
     holding buffers for the duration of a data transfer."
 )]
+#![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic)]
 
 //TODO insert version here and read it in other parts, also read this for the ota webview
 esp_bootloader_esp_idf::esp_app_desc!();
@@ -17,8 +18,7 @@ use crate::config::{NetworkConfig, PlantConfig, PlantControllerConfig};
 use crate::fat_error::FatResult;
 use crate::hal::esp::MQTT_STAY_ALIVE;
 use crate::hal::PROGRESS_ACTIVE;
-use crate::hal::{esp_time, TIME_ACCESS};
-use crate::log::{log, LOG_ACCESS};
+use crate::log::log;
 use crate::tank::{determine_tank_state, TankError, TankState, WATER_FROZEN_THRESH};
 use crate::webserver::http_server;
 use crate::{
@@ -39,10 +39,10 @@ use embassy_net::Stack;
 use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
 use embassy_sync::mutex::{Mutex, MutexGuard};
 use embassy_sync::once_lock::OnceLock;
-use embassy_time::{Duration, Instant, Timer, WithTimeout};
+use embassy_time::{Duration, Instant, Timer};
 use esp_hal::rom::ets_delay_us;
 use esp_hal::system::software_reset;
-use esp_println::{logger, println};
+use esp_println::println;
 use hal::battery::BatteryState;
 use log::LogMessage;
 use option_lock::OptionLock;
@@ -122,6 +122,7 @@ struct PumpInfo {
     median_current_ma: u16,
     max_current_ma: u16,
     min_current_ma: u16,
+    error: String,
 }
 
 #[derive(Serialize)]
@@ -129,10 +130,11 @@ pub struct PumpResult {
     median_current_ma: u16,
     max_current_ma: u16,
     min_current_ma: u16,
-    error: bool,
+    error: String,
     flow_value_ml: f32,
     flow_value_count: i16,
     pump_time_s: u16,
+    overcurrent_ma: Option<u16>,
 }
 
 #[derive(Serialize, Debug, PartialEq)]
@@ -167,26 +169,25 @@ async fn safe_main(spawner: Spawner) -> FatResult<()> {
     let cur = match board.board_hal.get_rtc_module().get_rtc_time().await {
         Ok(value) => {
             {
-                let guard = TIME_ACCESS.get().await.lock().await;
-                guard.set_current_time_us(value.timestamp_micros() as u64);
+                board
+                    .board_hal
+                    .get_esp()
+                    .rtc
+                    .set_current_time_us(value.timestamp_micros() as u64);
             }
             value
         }
         Err(err) => {
             info!("rtc module error: {err:?}");
             board.board_hal.general_fault(true).await;
-            esp_time().await
+            board.board_hal.get_time().await
         }
     };
 
     //check if we know the time current > 2020 (plausibility checks, this code is newer than 2020)
     if cur.year() < 2020 {
         to_config = true;
-        LOG_ACCESS
-            .lock()
-            .await
-            .log(LogMessage::YearInplausibleForceConfig, 0, 0, "", "")
-            .await;
+        log(LogMessage::YearInplausibleForceConfig, 0, 0, "", "");
     }
     info!("cur is {cur}");
     match update_charge_indicator(&mut board).await {
@@ -194,16 +195,12 @@ async fn safe_main(spawner: Spawner) -> FatResult<()> {
         Err(error) => {
             board.board_hal.general_fault(true).await;
             error!("Error updating charge indicator: {error}");
-            log(LogMessage::MPPTError, 0, 0, "", "").await;
+            log(LogMessage::MPPTError, 0, 0, "", "");
             let _ = board.board_hal.set_charge_indicator(false).await;
         }
     }
     if board.board_hal.get_esp().get_restart_to_conf() {
-        LOG_ACCESS
-            .lock()
-            .await
-            .log(LogMessage::ConfigModeSoftwareOverride, 0, 0, "", "")
-            .await;
+        log(LogMessage::ConfigModeSoftwareOverride, 0, 0, "", "");
         for _i in 0..2 {
             board.board_hal.general_fault(true).await;
             Timer::after_millis(100).await;
@@ -215,11 +212,7 @@ async fn safe_main(spawner: Spawner) -> FatResult<()> {
         board.board_hal.get_esp().set_restart_to_conf(false);
     } else if board.board_hal.get_esp().mode_override_pressed() {
         board.board_hal.general_fault(true).await;
-        LOG_ACCESS
-            .lock()
-            .await
-            .log(LogMessage::ConfigModeButtonOverride, 0, 0, "", "")
-            .await;
+        log(LogMessage::ConfigModeButtonOverride, 0, 0, "", "");
         for _i in 0..5 {
             board.board_hal.general_fault(true).await;
             Timer::after_millis(100).await;
@@ -247,8 +240,8 @@ async fn safe_main(spawner: Spawner) -> FatResult<()> {
         let reboot_now = Arc::new(AtomicBool::new(false));
         println!("starting webserver");
 
-        spawner.spawn(http_server(reboot_now.clone(), stack))?;
-        wait_infinity(board, WaitType::MissingConfig, reboot_now.clone()).await;
+        let _ = http_server(reboot_now.clone(), stack);
+        wait_infinity(board, WaitType::MissingConfig, reboot_now.clone(), UTC).await;
     }
 
     let mut stack: OptionLock<Stack> = OptionLock::empty();
@@ -285,7 +278,6 @@ async fn safe_main(spawner: Spawner) -> FatResult<()> {
         }),
         None => UTC, // Fallback to UTC if no timezone is set
     };
-    let _timezone = UTC;
 
     let timezone_time = cur.with_timezone(&timezone);
     info!(
@@ -297,46 +289,45 @@ async fn safe_main(spawner: Spawner) -> FatResult<()> {
 
     if let NetworkMode::Wifi { ref ip_address, .. } = network_mode {
         publish_firmware_info(&mut board, version, ip_address, &timezone_time.to_rfc3339()).await;
-        publish_battery_state(&mut board).await;
+        publish_battery_state(&mut board).await.unwrap_or_else(|e| {
+            error!("Error publishing battery state {e}");
+        });
         let _ = publish_mppt_state(&mut board).await;
     }
 
-    LOG_ACCESS
-        .lock()
-        .await
-        .log(
-            LogMessage::StartupInfo,
-            matches!(network_mode, NetworkMode::Wifi { .. }) as u32,
-            matches!(
-                network_mode,
-                NetworkMode::Wifi {
-                    sntp: SntpMode::Sync { .. },
-                    ..
-                }
-            ) as u32,
-            matches!(network_mode, NetworkMode::Wifi { mqtt: true, .. })
-                .to_string()
-                .as_str(),
-            "",
-        )
-        .await;
+    log(
+        LogMessage::StartupInfo,
+        matches!(network_mode, NetworkMode::Wifi { .. }) as u32,
+        matches!(
+            network_mode,
+            NetworkMode::Wifi {
+                sntp: SntpMode::Sync { .. },
+                ..
+            }
+        ) as u32,
+        matches!(network_mode, NetworkMode::Wifi { mqtt: true, .. })
+            .to_string()
+            .as_str(),
+        "",
+    );
 
     if to_config {
         //check if client or ap mode and init Wi-Fi
         info!("executing config mode override");
         //config upload will trigger reboot!
         let reboot_now = Arc::new(AtomicBool::new(false));
-        spawner.spawn(http_server(reboot_now.clone(), stack.take().unwrap()))?;
-        wait_infinity(board, WaitType::ConfigButton, reboot_now.clone()).await;
+        let stack_val = stack.take();
+        if let Some(s) = stack_val {
+            spawner.spawn(http_server(reboot_now.clone(), s)?);
+        } else {
+            bail!("Network stack missing, hard abort")
+        }
+        wait_infinity(board, WaitType::ConfigButton, reboot_now.clone(), timezone).await;
     } else {
-        LOG_ACCESS
-            .lock()
-            .await
-            .log(LogMessage::NormalRun, 0, 0, "", "")
-            .await;
+        log(LogMessage::NormalRun, 0, 0, "", "");
     }
 
-    let dry_run = false;
+    let dry_run = MQTT_STAY_ALIVE.load(Ordering::Relaxed);
 
     let tank_state = determine_tank_state(&mut board).await;
 
@@ -344,38 +335,22 @@ async fn safe_main(spawner: Spawner) -> FatResult<()> {
         if let Some(err) = tank_state.got_error(&board.board_hal.get_config().tank) {
             match err {
                 TankError::SensorDisabled => { /* unreachable */ }
-                TankError::SensorMissing(raw_value_mv) => {
-                    LOG_ACCESS
-                        .lock()
-                        .await
-                        .log(
-                            LogMessage::TankSensorMissing,
-                            raw_value_mv as u32,
-                            0,
-                            "",
-                            "",
-                        )
-                        .await
-                }
-                TankError::SensorValueError { value, min, max } => {
-                    LOG_ACCESS
-                        .lock()
-                        .await
-                        .log(
-                            LogMessage::TankSensorValueRangeError,
-                            min as u32,
-                            max as u32,
-                            &format!("{value}"),
-                            "",
-                        )
-                        .await
-                }
+                TankError::SensorMissing(raw_value_mv) => log(
+                    LogMessage::TankSensorMissing,
+                    raw_value_mv as u32,
+                    0,
+                    "",
+                    "",
+                ),
+                TankError::SensorValueError { value, min, max } => log(
+                    LogMessage::TankSensorValueRangeError,
+                    min as u32,
+                    max as u32,
+                    &format!("{value}"),
+                    "",
+                ),
                 TankError::BoardError(err) => {
-                    LOG_ACCESS
-                        .lock()
-                        .await
-                        .log(LogMessage::TankSensorBoardError, 0, 0, "", &err.to_string())
-                        .await
+                    log(LogMessage::TankSensorBoardError, 0, 0, "", &err.to_string())
                 }
             }
             // disabled cannot trigger this because of wrapping if is_enabled
@@ -384,11 +359,7 @@ async fn safe_main(spawner: Spawner) -> FatResult<()> {
             .warn_level(&board.board_hal.get_config().tank)
             .is_ok_and(|warn| warn)
         {
-            LOG_ACCESS
-                .lock()
-                .await
-                .log(LogMessage::TankWaterLevelLow, 0, 0, "", "")
-                .await;
+            log(LogMessage::TankWaterLevelLow, 0, 0, "", "");
             board.board_hal.general_fault(true).await;
         }
     }
@@ -406,22 +377,30 @@ async fn safe_main(spawner: Spawner) -> FatResult<()> {
     }
     info!("Water temp is {}", water_temp.as_ref().unwrap_or(&0.));
 
-    publish_tank_state(&mut board, &tank_state, water_temp).await;
+    publish_tank_state(&mut board, &tank_state, water_temp)
+        .await
+        .unwrap_or_else(|e| {
+            error!("Error publishing tank state {e}");
+        });
 
     let moisture = board.board_hal.measure_moisture_hz().await?;
 
-    let plantstate: [PlantState; PLANT_COUNT] = [
-        PlantState::read_hardware_state(moisture, 0, &mut board).await,
-        PlantState::read_hardware_state(moisture, 1, &mut board).await,
-        PlantState::read_hardware_state(moisture, 2, &mut board).await,
-        PlantState::read_hardware_state(moisture, 3, &mut board).await,
-        PlantState::read_hardware_state(moisture, 4, &mut board).await,
-        PlantState::read_hardware_state(moisture, 5, &mut board).await,
-        PlantState::read_hardware_state(moisture, 6, &mut board).await,
-        PlantState::read_hardware_state(moisture, 7, &mut board).await,
+    let mut plantstate: [PlantState; PLANT_COUNT] = [
+        PlantState::interpret_raw_values(moisture, 0, &mut board).await,
+        PlantState::interpret_raw_values(moisture, 1, &mut board).await,
+        PlantState::interpret_raw_values(moisture, 2, &mut board).await,
+        PlantState::interpret_raw_values(moisture, 3, &mut board).await,
+        PlantState::interpret_raw_values(moisture, 4, &mut board).await,
+        PlantState::interpret_raw_values(moisture, 5, &mut board).await,
+        PlantState::interpret_raw_values(moisture, 6, &mut board).await,
+        PlantState::interpret_raw_values(moisture, 7, &mut board).await,
     ];
 
-    publish_plant_states(&mut board, &timezone_time.clone(), &plantstate).await;
+    publish_plant_states(&mut board, &timezone_time.clone(), &plantstate)
+        .await
+        .unwrap_or_else(|e| {
+            error!("Error publishing plant states {e}");
+        });
 
     let pump_required = plantstate
         .iter()
@@ -429,11 +408,8 @@ async fn safe_main(spawner: Spawner) -> FatResult<()> {
         .any(|(it, conf)| it.needs_to_be_watered(conf, &timezone_time))
         && !water_frozen;
     if pump_required {
-        LOG_ACCESS
-            .lock()
-            .await
-            .log(LogMessage::EnableMain, dry_run as u32, 0, "", "")
-            .await;
+        log(LogMessage::EnableMain, dry_run as u32, 0, "", "");
+        let mut overcurrent_results: [Option<u16>; PLANT_COUNT] = [None; PLANT_COUNT];
         for (plant_id, (state, plant_config)) in plantstate
             .iter()
             .zip(&board.board_hal.get_config().plants.clone())
@@ -454,8 +430,7 @@ async fn safe_main(spawner: Spawner) -> FatResult<()> {
                         plant_config.max_consecutive_pump_count as u32,
                         &(plant_id + 1).to_string(),
                         "",
-                    )
-                    .await;
+                    );
                     board.board_hal.fault(plant_id, true).await?;
                 }
                 log(
@@ -464,8 +439,7 @@ async fn safe_main(spawner: Spawner) -> FatResult<()> {
                     plant_config.pump_time_s as u32,
                     &dry_run.to_string(),
                     "",
-                )
-                .await;
+                );
                 board
                     .board_hal
                     .get_esp()
@@ -473,21 +447,50 @@ async fn safe_main(spawner: Spawner) -> FatResult<()> {
                 board.board_hal.get_esp().last_pump_time(plant_id);
                 //state.active = true;
 
-                pump_info(plant_id, true, pump_ineffective, 0, 0, 0, false).await;
-
-                let result = do_secure_pump(&mut board, plant_id, plant_config, dry_run).await?;
-                //stop pump regardless of prior result//todo refactor to inner?
-                board.board_hal.pump(plant_id, false).await?;
                 pump_info(
+                    &mut board,
                     plant_id,
-                    false,
+                    true,
                     pump_ineffective,
-                    result.median_current_ma,
-                    result.max_current_ma,
-                    result.min_current_ma,
-                    result.error,
+                    0,
+                    0,
+                    0,
+                    String::new(),
                 )
                 .await;
+
+                let result = do_secure_pump(&mut board, plant_id, plant_config, dry_run).await;
+                match result {
+                    Ok(state) => {
+                        overcurrent_results[plant_id] = state.overcurrent_ma;
+                        pump_info(
+                            &mut board,
+                            plant_id,
+                            false,
+                            pump_ineffective,
+                            state.median_current_ma,
+                            state.max_current_ma,
+                            state.min_current_ma,
+                            state.error,
+                        )
+                        .await;
+                    }
+                    Err(err) => {
+                        pump_info(
+                            &mut board,
+                            plant_id,
+                            false,
+                            pump_ineffective,
+                            0,
+                            0,
+                            0,
+                            format!("{err:?}"),
+                        )
+                        .await;
+                    }
+                }
+                //stop pump regardless of prior result//todo refactor to inner?
+                board.board_hal.pump(plant_id, false).await?;
             } else if !state.pump_in_timeout(plant_config, &timezone_time) {
                 // plant does not need to be watered and is not in timeout
                 // -> reset consecutive pump count
@@ -497,6 +500,64 @@ async fn safe_main(spawner: Spawner) -> FatResult<()> {
                     .store_consecutive_pump_count(plant_id, 0);
             }
         }
+        for (plant_id, overcurrent) in overcurrent_results.iter().enumerate() {
+            if let Some(current_ma) = *overcurrent {
+                plantstate[plant_id].pump.overcurrent_error = Some(current_ma);
+            }
+        }
+        publish_plant_states(&mut board, &timezone_time.clone(), &plantstate)
+            .await
+            .unwrap_or_else(|e| {
+                error!("Error publishing plant states after pumping {e}");
+            });
+    } else {
+        // Pump corrosion protection: pulses each pump once a week for 2s around midday.
+        let last_check_day = board
+            .board_hal
+            .get_esp()
+            .get_last_corrosion_protection_check_day();
+        if board
+            .board_hal
+            .get_config()
+            .hardware
+            .pump_corrosion_protection
+        {
+            let current_day = timezone_time.weekday().number_from_monday() as i8;
+            let current_hour = timezone_time.hour();
+
+            // Monday (1) and around midday (11-13)
+            if current_day == 1 && (11..14).contains(&current_hour) {
+                if last_check_day != current_day {
+                    info!("Running pump corrosion protection");
+                    for plant_id in 0..PLANT_COUNT {
+                        let mut plant_config =
+                            board.board_hal.get_config().plants[plant_id].clone();
+                        plant_config.pump_time_s = 2;
+                        plant_config.pump_limit_ml = 1000; // high limit to ensure it runs for 2s
+
+                        log(
+                            LogMessage::PumpPlant,
+                            (plant_id + 1) as u32,
+                            2,
+                            "corrosion_prot",
+                            "",
+                        );
+                        let _ = do_secure_pump(&mut board, plant_id, &plant_config, dry_run).await;
+                        let _ = board.board_hal.pump(plant_id, false).await;
+                    }
+                    board
+                        .board_hal
+                        .get_esp()
+                        .set_last_corrosion_protection_check_day(current_day);
+                }
+            } else if last_check_day != current_day && current_day != 1 {
+                // Reset check day if it's a different day (and not Monday), so it can trigger again next week
+                board
+                    .board_hal
+                    .get_esp()
+                    .set_last_corrosion_protection_check_day(-1);
+            }
+        }
     }
 
     info!("state of charg");
@@ -606,35 +667,45 @@ async fn safe_main(spawner: Spawner) -> FatResult<()> {
                 .mqtt_publish("/deepsleep", "night 1h").await;
             60
         };
+
     let _ = board
         .board_hal
         .get_esp()
         .mqtt_publish("/state", "sleep")
         .await;
-
     info!("Go to sleep for {deep_sleep_duration_minutes} minutes");
+
     //determine next event
     //is light out of work trigger soon?
     //is battery low ??
     //is deep sleep
-    //TODO
-    //mark_app_valid();
 
     let stay_alive = MQTT_STAY_ALIVE.load(Ordering::Relaxed);
     info!("Check stay alive, current state is {stay_alive}");
 
     if stay_alive {
         let reboot_now = Arc::new(AtomicBool::new(false));
-        spawner.spawn(http_server(reboot_now.clone(), stack.take().unwrap()))?;
-        wait_infinity(board, WaitType::MqttConfig, reboot_now.clone()).await;
+        if let Some(s) = stack.take() {
+            spawner.spawn(http_server(reboot_now.clone(), s)?);
+            wait_infinity(board, WaitType::MqttConfig, reboot_now.clone(), timezone).await;
+        } else {
+            bail!("Network Stack missing, hard abort");
+        }
     } else {
         //TODO wait for all mqtt publishes?
+        log(
+            LogMessage::DeepSleep,
+            deep_sleep_duration_minutes,
+            0,
+            "",
+            "",
+        );
         Timer::after_millis(5000).await;
 
         board.board_hal.get_esp().set_restart_to_conf(false);
         board
             .board_hal
-            .deep_sleep(1000 * 1000 * 60 * deep_sleep_duration_minutes as u64)
+            .deep_sleep_ms(1000 * 60 * deep_sleep_duration_minutes as u64)
             .await;
     }
 }
@@ -652,11 +723,50 @@ pub async fn do_secure_pump(
 
     let mut current_collector = vec![0_u16; steps_in_50ms];
     let mut flow_collector = vec![0_i16; steps_in_50ms];
-    let mut error = false;
+    let mut error = String::new();
     let mut first_error = true;
     let mut pump_time_ms: u32 = 0;
+    let mut overcurrent_ma: Option<u16> = None;
 
     if !dry_run {
+        // Run fertilizer pump first if configured and not in cooldown
+        if plant_config.fertilizer_s > 0 {
+            let current_time = board.board_hal.get_time().await;
+            let last_fertilizer = board.board_hal.get_esp().last_fertilizer_time(plant_id);
+            let elapsed_minutes = (current_time.timestamp() - last_fertilizer) / 60;
+
+            if elapsed_minutes >= plant_config.fertilizer_cooldown_min as i64 {
+                info!(
+                    "Starting fertilizer pump for {} seconds (last fertilizer was {} minutes ago)",
+                    plant_config.fertilizer_s, elapsed_minutes
+                );
+                log(
+                    LogMessage::FertilizerApplied,
+                    plant_config.fertilizer_s as u32,
+                    (plant_id + 1) as u32,
+                    &elapsed_minutes.to_string(),
+                    "",
+                );
+                board.board_hal.fertilizer_pump(true).await?;
+                Timer::after_millis(plant_config.fertilizer_s as u64 * 1000).await;
+                board.board_hal.fertilizer_pump(false).await?;
+                info!("Fertilizer pump stopped");
+
+                // Store the current time as last fertilizer time
+                board
+                    .board_hal
+                    .get_esp()
+                    .store_last_fertilizer_time(plant_id, current_time);
+            } else {
+                let remaining_minutes =
+                    plant_config.fertilizer_cooldown_min as i64 - elapsed_minutes;
+                info!(
+                    "Skipping fertilizer (cooldown: {} minutes remaining)",
+                    remaining_minutes
+                );
+            }
+        }
+
         board.board_hal.get_tank_sensor()?.reset_flow_meter();
         board.board_hal.get_tank_sensor()?.start_flow_meter();
         board.board_hal.pump(plant_id, true).await?;
@@ -686,46 +796,48 @@ pub async fn do_secure_pump(
                         && high_current
                         && current_ma > STARTUP_ABORT_CURRENT_MA
                     {
+                        let err_msg = format!("OverCurrent startup: {}mA", current_ma);
                         log(
                             LogMessage::PumpOverCurrent,
                             plant_id as u32 + 1,
                             current_ma as u32,
                             plant_config.max_pump_current_ma.to_string().as_str(),
                             step.to_string().as_str(),
-                        )
-                        .await;
-                        error = true;
+                        );
+                        overcurrent_ma = Some(current_ma);
+                        error = err_msg;
                     } else if high_current && first_error {
+                        let err_msg = format!("OverCurrent: {}mA", current_ma);
                         log(
                             LogMessage::PumpOverCurrent,
                             plant_id as u32 + 1,
                             current_ma as u32,
                             plant_config.max_pump_current_ma.to_string().as_str(),
                             step.to_string().as_str(),
-                        )
-                        .await;
+                        );
+                        overcurrent_ma = Some(current_ma);
                         board.board_hal.general_fault(true).await;
                         board.board_hal.fault(plant_id, true).await?;
                         if !plant_config.ignore_current_error {
-                            error = true;
+                            error = err_msg;
                             break;
                         }
                         first_error = false;
                     }
                     let low_current = current_ma < plant_config.min_pump_current_ma;
                     if low_current && first_error {
+                        let err_msg = format!("OpenLoop: {}mA", current_ma);
                         log(
                             LogMessage::PumpOpenLoopCurrent,
                             plant_id as u32 + 1,
                             current_ma as u32,
                             plant_config.min_pump_current_ma.to_string().as_str(),
                             step.to_string().as_str(),
-                        )
-                        .await;
+                        );
                         board.board_hal.general_fault(true).await;
                         board.board_hal.fault(plant_id, true).await?;
                         if !plant_config.ignore_current_error {
-                            error = true;
+                            error = err_msg;
                             break;
                         }
                         first_error = false;
@@ -734,15 +846,15 @@ pub async fn do_secure_pump(
                 Err(err) => {
                     if !plant_config.ignore_current_error {
                         info!("Error getting pump current: {err}");
+                        let err_msg = format!("MissingSensor: {err:?}");
                         log(
                             LogMessage::PumpMissingSensorCurrent,
                             plant_id as u32,
                             0,
                             "",
                             "",
-                        )
-                        .await;
-                        error = true;
+                        );
+                        error = err_msg;
                         break;
                     } else {
                         error!("Error getting pump current: {err}");
@@ -764,9 +876,13 @@ pub async fn do_secure_pump(
                 }
                 None => Duration::from_millis(1),
             };
+            hal::PlantHal::feed_watchdog();
             Timer::after(sleep_time).await;
             pump_time_ms += 50;
         }
+    } else {
+        //noticable dummy value
+        pump_time_ms = 1337;
     }
     board.board_hal.get_tank_sensor()?.stop_flow_meter();
     let final_flow_value = board.board_hal.get_tank_sensor()?.get_flow_meter_value();
@@ -781,6 +897,7 @@ pub async fn do_secure_pump(
         flow_value_count: final_flow_value,
         pump_time_s: (pump_time_ms / 1000) as u16,
         error,
+        overcurrent_ma,
     })
 }
 
@@ -801,30 +918,29 @@ async fn publish_tank_state(
     board: &mut MutexGuard<'_, CriticalSectionRawMutex, HAL<'static>>,
     tank_state: &TankState,
     water_temp: FatResult<f32>,
-) {
+) -> FatResult<()> {
     let state = serde_json::to_string(
         &tank_state.as_mqtt_info(&board.board_hal.get_config().tank, &water_temp),
-    )
-    .unwrap();
+    )?;
     board
         .board_hal
         .get_esp()
         .mqtt_publish("/water", &state)
         .await;
+    Ok(())
 }
 
 async fn publish_plant_states(
     board: &mut MutexGuard<'_, CriticalSectionRawMutex, HAL<'static>>,
     timezone_time: &DateTime<Tz>,
     plantstate: &[PlantState; 8],
-) {
+) -> FatResult<()> {
     for (plant_id, (plant_state, plant_conf)) in plantstate
         .iter()
         .zip(&board.board_hal.get_config().plants.clone())
         .enumerate()
     {
-        let state =
-            serde_json::to_string(&plant_state.to_mqtt_info(plant_conf, timezone_time)).unwrap();
+        let state = serde_json::to_string(&plant_state.to_mqtt_info(plant_conf, timezone_time))?;
         let plant_topic = format!("/plant{}", plant_id + 1);
         let _ = board
             .board_hal
@@ -832,6 +948,7 @@ async fn publish_plant_states(
             .mqtt_publish(&plant_topic, &state)
             .await;
     }
+    Ok(())
 }
 
 async fn publish_firmware_info(
@@ -927,13 +1044,14 @@ async fn try_connect_wifi_sntp_mqtt(
 }
 
 async fn pump_info(
+    board: &mut MutexGuard<'_, CriticalSectionRawMutex, HAL<'static>>,
     plant_id: usize,
     pump_active: bool,
     pump_ineffective: bool,
     median_current_ma: u16,
     max_current_ma: u16,
     min_current_ma: u16,
-    _error: bool,
+    error: String,
 ) {
     let pump_info = PumpInfo {
         enabled: pump_active,
@@ -941,16 +1059,13 @@ async fn pump_info(
         median_current_ma,
         max_current_ma,
         min_current_ma,
+        error,
     };
     let pump_topic = format!("/pump{}", plant_id + 1);
 
     match serde_json::to_string(&pump_info) {
         Ok(state) => {
-            BOARD_ACCESS
-                .get()
-                .await
-                .lock()
-                .await
+            board
                 .board_hal
                 .get_esp()
                 .mqtt_publish(&pump_topic, &state)
@@ -983,11 +1098,11 @@ async fn publish_mppt_state(
 
 async fn publish_battery_state(
     board: &mut MutexGuard<'_, CriticalSectionRawMutex, HAL<'static>>,
-) -> () {
+) -> FatResult<()> {
     let state = board.board_hal.get_battery_monitor().get_state().await;
     let value = match state {
         Ok(state) => {
-            let json = serde_json::to_string(&state).unwrap().to_owned();
+            let json = serde_json::to_string(&state)?.to_owned();
             json.to_owned()
         }
         Err(_) => "error".to_owned(),
@@ -999,12 +1114,14 @@ async fn publish_battery_state(
             .mqtt_publish("/battery", &value)
             .await;
     }
+    Ok(())
 }
 
 async fn wait_infinity(
     board: MutexGuard<'_, CriticalSectionRawMutex, HAL<'static>>,
     wait_type: WaitType,
     reboot_now: Arc<AtomicBool>,
+    timezone: Tz,
 ) -> ! {
     //since we force to have the lock when entering, we can release it to ensure the caller does not forget to dispose of it
     drop(board);
@@ -1014,6 +1131,7 @@ async fn wait_infinity(
     let mut pattern_step = 0;
     let serial_config_receive = AtomicBool::new(false);
     let mut suppress_further_mppt_error = false;
+    let mut last_mqtt_update: Option<Instant> = None;
 
     // Long-press exit (for webserver config modes): hold boot button for 5 seconds.
     let mut exit_hold_started: Option<Instant> = None;
@@ -1045,8 +1163,7 @@ async fn wait_infinity(
                 exit_hold_blink = !exit_hold_blink;
 
                 let progress = core::cmp::min(elapsed, exit_hold_duration);
-                let lit = ((progress.as_millis() as u64 * 8)
-                    / exit_hold_duration.as_millis() as u64)
+                let lit = ((progress.as_millis() * 8) / exit_hold_duration.as_millis())
                     .saturating_add(1)
                     .min(8) as usize;
 
@@ -1060,7 +1177,7 @@ async fn wait_infinity(
                     board.board_hal.get_esp().set_restart_to_conf(false);
                     // ensure clean http answer / visible confirmation
                     Timer::after_millis(500).await;
-                    board.board_hal.deep_sleep(0).await;
+                    board.board_hal.deep_sleep_ms(0).await;
                 }
 
                 // Short tick while holding so the pattern updates smoothly.
@@ -1091,6 +1208,22 @@ async fn wait_infinity(
                 }
             }
 
+            // MQTT updates in config mode
+            let now = Instant::now();
+            if last_mqtt_update.is_none()
+                || now.duration_since(last_mqtt_update.unwrap_or(Instant::from_secs(0)))
+                    >= Duration::from_secs(60)
+            {
+                let cur = board.board_hal.get_time().await;
+                let timezone_time = cur.with_timezone(&timezone);
+
+                let esp = board.board_hal.get_esp();
+                esp.mqtt_publish("/state", "config").await;
+                esp.mqtt_publish("/firmware/last_online", &timezone_time.to_rfc3339())
+                    .await;
+                last_mqtt_update = Some(now);
+            }
+
             // Skip default blink code when a progress display is active
             if !PROGRESS_ACTIVE.load(Ordering::Relaxed) {
                 match wait_type {
@@ -1138,6 +1271,8 @@ async fn wait_infinity(
 
         Timer::after_millis(delay).await;
 
+        hal::PlantHal::feed_watchdog();
+
         if wait_type == WaitType::MqttConfig && !MQTT_STAY_ALIVE.load(Ordering::Relaxed) {
             reboot_now.store(true, Ordering::Relaxed);
         }
@@ -1151,7 +1286,7 @@ async fn wait_infinity(
                 .lock()
                 .await
                 .board_hal
-                .deep_sleep(0)
+                .deep_sleep_ms(0)
                 .await;
         }
     }
@@ -1196,10 +1331,13 @@ async fn handle_serial_config(
     }
 }
 
+use embassy_time::WithTimeout;
+#[allow(clippy::panic, clippy::unwrap_used, clippy::expect_used)]
 #[esp_rtos::main]
 async fn main(spawner: Spawner) -> ! {
     // intialize embassy
-    logger::init_logger_from_env();
+    crate::log::INTERCEPTOR.init();
+    spawner.spawn(log::log_task().unwrap());
     //force init here!
     match BOARD_ACCESS.init(
         PlantHal::create()
@@ -1244,12 +1382,17 @@ async fn get_version(
     let hash = &env!("VERGEN_GIT_SHA")[0..8];
 
     let board = board.board_hal.get_esp();
+    let heap = esp_alloc::HEAP.stats();
     VersionInfo {
         git_hash: branch + "@" + hash,
         build_time: env!("VERGEN_BUILD_TIMESTAMP").to_owned(),
         current: format!("{:?}", board.current),
         slot0_state: format!("{:?}", board.slot0_state),
         slot1_state: format!("{:?}", board.slot1_state),
+        heap_total: heap.size,
+        heap_used: heap.current_usage,
+        heap_free: heap.size.saturating_sub(heap.current_usage),
+        heap_max_used: heap.max_usage,
     }
 }
 
@@ -1260,4 +1403,8 @@ struct VersionInfo {
     current: String,
     slot0_state: String,
     slot1_state: String,
+    heap_total: usize,
+    heap_used: usize,
+    heap_free: usize,
+    heap_max_used: usize,
 }
diff --git a/Software/MainBoard/rust/src/mcutie_3_0_0/Cargo.toml b/Software/MainBoard/rust/src/mcutie_3_0_0/Cargo.toml
new file mode 100644
index 0000000..eb48eb1
--- /dev/null
+++ b/Software/MainBoard/rust/src/mcutie_3_0_0/Cargo.toml
@@ -0,0 +1,34 @@
+[package]
+name = "mcutie"
+version = "3.0.0"
+edition = "2021"
+
+[lib]
+path = "lib.rs"
+
+[features]
+default = []
+homeassistant = []
+serde = ["dep:serde", "heapless/serde"]
+defmt = []
+log = ["dep:log"]
+
+[dependencies]
+embassy-net = { version = "0.8.0", default-features = false, features = ["tcp", "dns", "proto-ipv4", "proto-ipv6", "medium-ethernet"] }
+embassy-sync = { version = "0.8.0", default-features = false }
+embassy-time = { version = "0.5.1", default-features = false }
+embassy-futures = { version = "0.1.2", default-features = false }
+embedded-io = { version = "0.7.1", default-features = false }
+embedded-io-async = { version = "0.7.0", default-features = false }
+heapless = { version = "0.7.17", default-features = false }
+mqttrs = { version = "0.4.1", default-features = false }
+once_cell = { version = "1.21.3", default-features = false, features = ["critical-section"] }
+pin-project = { version = "1.1.10", default-features = false }
+hex = { version = "0.4.3", default-features = false }
+serde = { version = "1.0.228", default-features = false, features = ["derive"], optional = true }
+log = { version = "0.4.28", default-features = false, optional = true }
+
+[dev-dependencies]
+futures-executor = "0.3.31"
+futures-timer = "3.0.3"
+futures-util = "0.3.31"
diff --git a/Software/MainBoard/rust/src/mcutie_3_0_0/buffer.rs b/Software/MainBoard/rust/src/mcutie_3_0_0/buffer.rs
new file mode 100644
index 0000000..2397f80
--- /dev/null
+++ b/Software/MainBoard/rust/src/mcutie_3_0_0/buffer.rs
@@ -0,0 +1,124 @@
+use core::{cmp, fmt, ops::Deref};
+
+use embedded_io::{SliceWriteError, Write};
+use mqttrs::{encode_slice, Packet};
+
+use crate::Error;
+
+/// A stack allocated buffer that can be written to and then read back from.
+/// Dereferencing as a [`u8`] slice allows access to previously written data.
+///
+/// Can be written to with [`write!`] and supports [`embedded_io::Write`] and
+/// [`embedded_io_async::Write`].
+pub struct Buffer<const N: usize> {
+    bytes: [u8; N],
+    cursor: usize,
+}
+
+impl<const N: usize> Default for Buffer<N> {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl<const N: usize> Buffer<N> {
+    /// Creates a new buffer.
+    pub(crate) const fn new() -> Self {
+        Self {
+            bytes: [0; N],
+            cursor: 0,
+        }
+    }
+
+    /// Creates a new buffer and writes the given data into it.
+    pub(crate) fn from(buf: &[u8]) -> Result<Self, Error> {
+        let mut buffer = Self::new();
+        match buffer.write_all(buf) {
+            Ok(()) => Ok(buffer),
+            Err(_) => Err(Error::TooLarge),
+        }
+    }
+
+    pub(crate) fn encode_packet(&mut self, packet: &Packet<'_>) -> Result<(), mqttrs::Error> {
+        let len = encode_slice(packet, &mut self.bytes[self.cursor..])?;
+        self.cursor += len;
+
+        Ok(())
+    }
+
+    #[cfg(feature = "serde")]
+    /// Serializes a value into this buffer using JSON.
+    pub(crate) fn serialize_json<T: serde::Serialize>(
+        &mut self,
+        value: &T,
+    ) -> Result<(), serde_json_core::ser::Error> {
+        let len = serde_json_core::to_slice(value, &mut self.bytes[self.cursor..])?;
+        self.cursor += len;
+
+        Ok(())
+    }
+
+    #[cfg(feature = "serde")]
+    /// Deserializes this buffer using JSON into the given type.
+    pub fn deserialize_json<'a, T: serde::Deserialize<'a>>(
+        &'a self,
+    ) -> Result<T, serde_json_core::de::Error> {
+        let (result, _) = serde_json_core::from_slice(self)?;
+
+        Ok(result)
+    }
+
+    /// The number of bytes available for writing into this buffer.
+    pub fn available(&self) -> usize {
+        N - self.cursor
+    }
+}
+
+impl<const N: usize> Deref for Buffer<N> {
+    type Target = [u8];
+
+    fn deref(&self) -> &Self::Target {
+        &self.bytes[0..self.cursor]
+    }
+}
+
+impl<const N: usize> fmt::Write for Buffer<N> {
+    fn write_str(&mut self, s: &str) -> fmt::Result {
+        self.write_all(s.as_bytes()).map_err(|_| fmt::Error)
+    }
+}
+
+impl<const N: usize> embedded_io::ErrorType for Buffer<N> {
+    type Error = SliceWriteError;
+}
+
+impl<const N: usize> embedded_io::Write for Buffer<N> {
+    fn write(&mut self, buf: &[u8]) -> Result<usize, Self::Error> {
+        if buf.is_empty() {
+            return Ok(0);
+        }
+
+        let writable = cmp::min(self.available(), buf.len());
+        if writable == 0 {
+            Err(SliceWriteError::Full)
+        } else {
+            self.bytes[self.cursor..self.cursor + writable].copy_from_slice(buf);
+            self.cursor += writable;
+            Ok(writable)
+        }
+    }
+
+    fn flush(&mut self) -> Result<(), Self::Error> {
+        Ok(())
+    }
+}
+
+impl<const N: usize> embedded_io_async::Write for Buffer<N> {
+    async fn write(&mut self, buf: &[u8]) -> Result<usize, Self::Error> {
+        <Self as embedded_io::Write>::write(self, buf)
+    }
+
+    async fn flush(&mut self) -> Result<(), Self::Error> {
+        Ok(())
+    }
+}
diff --git a/Software/MainBoard/rust/src/mcutie_3_0_0/fmt.rs b/Software/MainBoard/rust/src/mcutie_3_0_0/fmt.rs
new file mode 100644
index 0000000..b678fbf
--- /dev/null
+++ b/Software/MainBoard/rust/src/mcutie_3_0_0/fmt.rs
@@ -0,0 +1,80 @@
+#![macro_use]
+
+#[cfg(all(feature = "defmt", feature = "log"))]
+compile_error!("The `defmt` and `log` features cannot both be enabled at the same time.");
+
+#[cfg(not(feature = "defmt"))]
+use core::fmt;
+
+#[cfg(feature = "defmt")]
+pub(crate) use ::defmt::Debug2Format;
+
+#[cfg(not(feature = "defmt"))]
+pub(crate) struct Debug2Format<D: fmt::Debug>(pub(crate) D);
+
+#[cfg(feature = "log")]
+impl<D: fmt::Debug> fmt::Debug for Debug2Format<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.fmt(f)
+    }
+}
+
+#[collapse_debuginfo(yes)]
+macro_rules! trace {
+    ($s:literal $(, $x:expr)* $(,)?) => {
+        #[cfg(feature = "defmt")]
+        ::defmt::trace!($s $(, $x)*);
+        #[cfg(feature = "log")]
+        ::log::trace!($s $(, $x)*);
+        #[cfg(not(any(feature="defmt", feature="log")))]
+        let _ = ($( & $x ),*);
+    };
+}
+
+#[collapse_debuginfo(yes)]
+macro_rules! debug {
+    ($s:literal $(, $x:expr)* $(,)?) => {
+        #[cfg(feature = "defmt")]
+        ::defmt::debug!($s $(, $x)*);
+        #[cfg(feature = "log")]
+        ::log::debug!($s $(, $x)*);
+        #[cfg(not(any(feature="defmt", feature="log")))]
+        let _ = ($( & $x ),*);
+    };
+}
+
+#[collapse_debuginfo(yes)]
+macro_rules! info {
+    ($s:literal $(, $x:expr)* $(,)?) => {
+        #[cfg(feature = "defmt")]
+        ::defmt::info!($s $(, $x)*);
+        #[cfg(feature = "log")]
+        ::log::info!($s $(, $x)*);
+        #[cfg(not(any(feature="defmt", feature="log")))]
+        let _ = ($( & $x ),*);
+    };
+}
+
+#[collapse_debuginfo(yes)]
+macro_rules! warn {
+    ($s:literal $(, $x:expr)* $(,)?) => {
+        #[cfg(feature = "defmt")]
+        ::defmt::warn!($s $(, $x)*);
+        #[cfg(feature = "log")]
+        ::log::warn!($s $(, $x)*);
+        #[cfg(not(any(feature="defmt", feature="log")))]
+        let _ = ($( & $x ),*);
+    };
+}
+
+#[collapse_debuginfo(yes)]
+macro_rules! error {
+    ($s:literal $(, $x:expr)* $(,)?) => {
+        #[cfg(feature = "defmt")]
+        ::defmt::error!($s $(, $x)*);
+        #[cfg(feature = "log")]
+        ::log::error!($s $(, $x)*);
+        #[cfg(not(any(feature="defmt", feature="log")))]
+        let _ = ($( & $x ),*);
+    };
+}
diff --git a/Software/MainBoard/rust/src/mcutie_3_0_0/homeassistant/binary_sensor.rs b/Software/MainBoard/rust/src/mcutie_3_0_0/homeassistant/binary_sensor.rs
new file mode 100644
index 0000000..b62d2fd
--- /dev/null
+++ b/Software/MainBoard/rust/src/mcutie_3_0_0/homeassistant/binary_sensor.rs
@@ -0,0 +1,120 @@
+//! Tools for publishing a [Home Assistant binary sensor](https://www.home-assistant.io/integrations/binary_sensor.mqtt/).
+use core::ops::Deref;
+
+use serde::{Deserialize, Serialize};
+
+use crate::{homeassistant::Component, Error, Publishable, Topic};
+
+/// The state of the sensor. Can be easily converted to or from a [`bool`].
+#[derive(Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(from = "&str", into = "&'static str")]
+#[allow(missing_docs)]
+pub enum BinarySensorState {
+    On,
+    Off,
+}
+
+impl From<BinarySensorState> for &'static str {
+    fn from(state: BinarySensorState) -> Self {
+        match state {
+            BinarySensorState::On => "ON",
+            BinarySensorState::Off => "OFF",
+        }
+    }
+}
+
+impl<'a> From<&'a str> for BinarySensorState {
+    fn from(st: &'a str) -> Self {
+        if st == "ON" {
+            Self::On
+        } else {
+            Self::Off
+        }
+    }
+}
+
+impl From<bool> for BinarySensorState {
+    fn from(val: bool) -> Self {
+        if val {
+            BinarySensorState::On
+        } else {
+            BinarySensorState::Off
+        }
+    }
+}
+
+impl From<BinarySensorState> for bool {
+    fn from(val: BinarySensorState) -> Self {
+        match val {
+            BinarySensorState::On => true,
+            BinarySensorState::Off => true,
+        }
+    }
+}
+
+impl AsRef<[u8]> for BinarySensorState {
+    fn as_ref(&self) -> &'static [u8] {
+        match self {
+            Self::On => "ON".as_bytes(),
+            Self::Off => "OFF".as_bytes(),
+        }
+    }
+}
+
+/// The type of sensor.
+#[derive(Serialize)]
+#[serde(rename_all = "snake_case")]
+#[allow(missing_docs)]
+pub enum BinarySensorClass {
+    Battery,
+    BatteryCharging,
+    CarbonMonoxide,
+    Cold,
+    Connectivity,
+    Door,
+    GarageDoor,
+    Gas,
+    Heat,
+    Light,
+    Lock,
+    Moisture,
+    Motion,
+    Moving,
+    Occupancy,
+    Opening,
+    Plug,
+    Power,
+    Presence,
+    Problem,
+    Running,
+    Safety,
+    Smoke,
+    Sound,
+    Tamper,
+    Update,
+    Vibration,
+    Window,
+}
+
+/// A binary sensor that can publish a [`BinarySensorState`] status.
+#[derive(Serialize)]
+pub struct BinarySensor {
+    /// The type of sensor
+    pub device_class: Option<BinarySensorClass>,
+}
+
+impl Component for BinarySensor {
+    type State = BinarySensorState;
+
+    fn platform() -> &'static str {
+        "binary_sensor"
+    }
+
+    async fn publish_state<T: Deref<Target = str>>(
+        &self,
+        topic: &Topic<T>,
+        state: Self::State,
+    ) -> Result<(), Error> {
+        topic.with_bytes(state).publish().await
+    }
+}
diff --git a/Software/MainBoard/rust/src/mcutie_3_0_0/homeassistant/button.rs b/Software/MainBoard/rust/src/mcutie_3_0_0/homeassistant/button.rs
new file mode 100644
index 0000000..b19a66f
--- /dev/null
+++ b/Software/MainBoard/rust/src/mcutie_3_0_0/homeassistant/button.rs
@@ -0,0 +1,40 @@
+//! Tools for publishing a [Home Assistant button](https://www.home-assistant.io/integrations/button.mqtt/).
+use core::ops::Deref;
+
+use serde::Serialize;
+
+use crate::{homeassistant::Component, Error, Topic};
+
+/// The type of button.
+#[derive(Serialize)]
+#[serde(rename_all = "snake_case")]
+#[allow(missing_docs)]
+pub enum ButtonClass {
+    Identify,
+    Restart,
+    Update,
+}
+
+/// A button that can be pressed.
+#[derive(Serialize)]
+pub struct Button {
+    /// The type of button.
+    pub device_class: Option<ButtonClass>,
+}
+
+impl Component for Button {
+    type State = ();
+
+    fn platform() -> &'static str {
+        "button"
+    }
+
+    async fn publish_state<T: Deref<Target = str>>(
+        &self,
+        _topic: &Topic<T>,
+        _state: Self::State,
+    ) -> Result<(), Error> {
+        // Buttons don't have a state
+        Err(Error::Invalid)
+    }
+}
diff --git a/Software/MainBoard/rust/src/mcutie_3_0_0/homeassistant/light.rs b/Software/MainBoard/rust/src/mcutie_3_0_0/homeassistant/light.rs
new file mode 100644
index 0000000..1b85d11
--- /dev/null
+++ b/Software/MainBoard/rust/src/mcutie_3_0_0/homeassistant/light.rs
@@ -0,0 +1,384 @@
+//! Tools for publishing a [Home Assistant light](https://www.home-assistant.io/integrations/light.mqtt/).
+use core::{ops::Deref, str};
+
+use serde::{ser::SerializeStruct, Deserialize, Serialize, Serializer};
+
+use crate::{
+    fmt::Debug2Format,
+    homeassistant::{binary_sensor::BinarySensorState, ser::List, Component},
+    Error, Payload, Publishable, Topic,
+};
+
+#[derive(Serialize)]
+#[serde(rename_all = "lowercase")]
+#[allow(missing_docs)]
+pub enum SupportedColorMode {
+    OnOff,
+    Brightness,
+    #[serde(rename = "color_temp")]
+    ColorTemp,
+    Hs,
+    Xy,
+    Rgb,
+    Rgbw,
+    Rgbww,
+    White,
+}
+
+#[derive(Serialize, Deserialize, Default)]
+struct SerializedColor {
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    h: Option<f32>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    s: Option<f32>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    x: Option<f32>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    y: Option<f32>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    r: Option<u8>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    g: Option<u8>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    b: Option<u8>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    w: Option<u8>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    c: Option<u8>,
+}
+
+#[derive(Deserialize)]
+struct LedPayload<'a> {
+    state: BinarySensorState,
+    #[serde(default)]
+    brightness: Option<u8>,
+    #[serde(default)]
+    color_temp: Option<u32>,
+    #[serde(default)]
+    color: Option<SerializedColor>,
+    #[serde(default)]
+    effect: Option<&'a str>,
+}
+
+/// The color of the light in various forms.
+#[derive(Serialize)]
+#[serde(rename_all = "lowercase", tag = "color_mode", content = "color")]
+#[allow(missing_docs)]
+pub enum Color {
+    None,
+    Brightness(u8),
+    ColorTemp(u32),
+    Hs {
+        #[serde(rename = "h")]
+        hue: f32,
+        #[serde(rename = "s")]
+        saturation: f32,
+    },
+    Xy {
+        x: f32,
+        y: f32,
+    },
+    Rgb {
+        #[serde(rename = "r")]
+        red: u8,
+        #[serde(rename = "g")]
+        green: u8,
+        #[serde(rename = "b")]
+        blue: u8,
+    },
+    Rgbw {
+        #[serde(rename = "r")]
+        red: u8,
+        #[serde(rename = "g")]
+        green: u8,
+        #[serde(rename = "b")]
+        blue: u8,
+        #[serde(rename = "w")]
+        white: u8,
+    },
+    Rgbww {
+        #[serde(rename = "r")]
+        red: u8,
+        #[serde(rename = "g")]
+        green: u8,
+        #[serde(rename = "b")]
+        blue: u8,
+        #[serde(rename = "c")]
+        cool_white: u8,
+        #[serde(rename = "w")]
+        warm_white: u8,
+    },
+}
+
+/// The state of the light. This can be sent to the broker and received as a
+/// command from Home Assistant.
+pub struct LightState<'a> {
+    /// Whether the light is on or off.
+    pub state: BinarySensorState,
+    /// The color of the light.
+    pub color: Color,
+    /// Any effect that is applied.
+    pub effect: Option<&'a str>,
+}
+
+impl<'a> LightState<'a> {
+    /// Parses the state from a command payload.
+    pub fn from_payload(payload: &'a Payload) -> Result<Self, Error> {
+        let parsed: LedPayload<'a> = match payload.deserialize_json() {
+            Ok(p) => p,
+            Err(e) => {
+                warn!("Failed to deserialize packet: {:?}", Debug2Format(&e));
+                if let Ok(s) = str::from_utf8(payload) {
+                    trace!("{}", s);
+                }
+                return Err(Error::PacketError);
+            }
+        };
+
+        let color = if let Some(color) = parsed.color {
+            if let Some(x) = color.x {
+                Color::Xy {
+                    x,
+                    y: color.y.unwrap_or_default(),
+                }
+            } else if let Some(h) = color.h {
+                Color::Hs {
+                    hue: h,
+                    saturation: color.s.unwrap_or_default(),
+                }
+            } else if let Some(c) = color.c {
+                Color::Rgbww {
+                    red: color.r.unwrap_or_default(),
+                    green: color.g.unwrap_or_default(),
+                    blue: color.b.unwrap_or_default(),
+                    cool_white: c,
+                    warm_white: color.w.unwrap_or_default(),
+                }
+            } else if let Some(w) = color.w {
+                Color::Rgbw {
+                    red: color.r.unwrap_or_default(),
+                    green: color.g.unwrap_or_default(),
+                    blue: color.b.unwrap_or_default(),
+                    white: w,
+                }
+            } else {
+                Color::Rgb {
+                    red: color.r.unwrap_or_default(),
+                    green: color.g.unwrap_or_default(),
+                    blue: color.b.unwrap_or_default(),
+                }
+            }
+        } else if let Some(color_temp) = parsed.color_temp {
+            Color::ColorTemp(color_temp)
+        } else if let Some(brightness) = parsed.brightness {
+            Color::Brightness(brightness)
+        } else {
+            Color::None
+        };
+
+        Ok(LightState {
+            state: parsed.state,
+            color,
+            effect: parsed.effect,
+        })
+    }
+}
+
+impl Serialize for LightState<'_> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let mut len = 1;
+
+        if self.effect.is_some() {
+            len += 1;
+        }
+
+        match self.color {
+            Color::None => {}
+            Color::Brightness(_) | Color::ColorTemp(_) => len += 1,
+            _ => len += 2,
+        }
+
+        let mut serializer = serializer.serialize_struct("LightState", len)?;
+
+        serializer.serialize_field("state", &self.state)?;
+
+        if let Some(effect) = self.effect {
+            serializer.serialize_field("effect", effect)?;
+        } else {
+            serializer.skip_field("effect")?;
+        }
+
+        match self.color {
+            Color::None => {
+                serializer.skip_field("brightness")?;
+                serializer.skip_field("color_temp")?;
+                serializer.skip_field("color")?;
+            }
+            Color::Brightness(b) => {
+                serializer.skip_field("color_temp")?;
+                serializer.skip_field("color")?;
+
+                serializer.serialize_field("brightness", &b)?
+            }
+            Color::ColorTemp(c) => {
+                serializer.skip_field("brightness")?;
+                serializer.skip_field("color")?;
+
+                serializer.serialize_field("color_temp", &c)?
+            }
+            Color::Hs { hue, saturation } => {
+                serializer.skip_field("brightness")?;
+                serializer.skip_field("color_temp")?;
+
+                serializer.serialize_field("color_mode", "hs")?;
+
+                let color = SerializedColor {
+                    h: Some(hue),
+                    s: Some(saturation),
+                    ..Default::default()
+                };
+
+                serializer.serialize_field("color", &color)?
+            }
+            Color::Xy { x, y } => {
+                serializer.skip_field("brightness")?;
+                serializer.skip_field("color_temp")?;
+
+                serializer.serialize_field("color_mode", "xy")?;
+
+                let color = SerializedColor {
+                    x: Some(x),
+                    y: Some(y),
+                    ..Default::default()
+                };
+
+                serializer.serialize_field("color", &color)?
+            }
+            Color::Rgb { red, green, blue } => {
+                serializer.skip_field("brightness")?;
+                serializer.skip_field("color_temp")?;
+
+                serializer.serialize_field("color_mode", "rgb")?;
+
+                let color = SerializedColor {
+                    r: Some(red),
+                    g: Some(green),
+                    b: Some(blue),
+                    ..Default::default()
+                };
+
+                serializer.serialize_field("color", &color)?
+            }
+            Color::Rgbw {
+                red,
+                green,
+                blue,
+                white,
+            } => {
+                serializer.skip_field("brightness")?;
+                serializer.skip_field("color_temp")?;
+
+                serializer.serialize_field("color_mode", "rgbw")?;
+
+                let color = SerializedColor {
+                    r: Some(red),
+                    g: Some(green),
+                    b: Some(blue),
+                    w: Some(white),
+                    ..Default::default()
+                };
+
+                serializer.serialize_field("color", &color)?
+            }
+            Color::Rgbww {
+                red,
+                green,
+                blue,
+                cool_white,
+                warm_white,
+            } => {
+                serializer.skip_field("brightness")?;
+                serializer.skip_field("color_temp")?;
+
+                serializer.serialize_field("color_mode", "rgbww")?;
+
+                let color = SerializedColor {
+                    r: Some(red),
+                    g: Some(green),
+                    b: Some(blue),
+                    c: Some(cool_white),
+                    w: Some(warm_white),
+                    ..Default::default()
+                };
+
+                serializer.serialize_field("color", &color)?
+            }
+        }
+
+        serializer.end()
+    }
+}
+
+/// A light entity
+pub struct Light<'a, const C: usize, const E: usize> {
+    /// The color modes supported by the light.
+    pub supported_color_modes: [SupportedColorMode; C],
+    /// Any effects that can be used.
+    pub effects: [&'a str; E],
+}
+
+impl<const C: usize, const E: usize> Serialize for Light<'_, C, E> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let mut len = 2;
+
+        if C > 0 {
+            len += 1;
+        }
+
+        if E > 0 {
+            len += 2;
+        }
+
+        let mut serializer = serializer.serialize_struct("Light", len)?;
+
+        serializer.serialize_field("schema", "json")?;
+
+        if C > 0 {
+            serializer.serialize_field("sup_clrm", &List::new(&self.supported_color_modes))?;
+        } else {
+            serializer.skip_field("sup_clrm")?;
+        }
+
+        if E > 0 {
+            serializer.serialize_field("effect", &true)?;
+            serializer.serialize_field("fx_list", &List::new(&self.effects))?;
+        } else {
+            serializer.skip_field("effect")?;
+            serializer.skip_field("fx_list")?;
+        }
+
+        serializer.end()
+    }
+}
+
+impl<const C: usize, const E: usize> Component for Light<'_, C, E> {
+    type State = LightState<'static>;
+
+    fn platform() -> &'static str {
+        "light"
+    }
+
+    async fn publish_state<T: Deref<Target = str>>(
+        &self,
+        topic: &Topic<T>,
+        state: Self::State,
+    ) -> Result<(), Error> {
+        topic.with_json(state).publish().await
+    }
+}
diff --git a/Software/MainBoard/rust/src/mcutie_3_0_0/homeassistant/mod.rs b/Software/MainBoard/rust/src/mcutie_3_0_0/homeassistant/mod.rs
new file mode 100644
index 0000000..8d98205
--- /dev/null
+++ b/Software/MainBoard/rust/src/mcutie_3_0_0/homeassistant/mod.rs
@@ -0,0 +1,295 @@
+//! Home Assistant auto-discovery and related messages.
+//!
+//! Normally you would declare your entities statically in your binary. It is
+//! then trivial to send out discovery messages or state changes.
+//!
+//! ```
+//! # use mcutie::{Publishable, Topic};
+//! # use mcutie::homeassistant::{Entity, Device, Origin, AvailabilityState, AvailabilityTopics};
+//! # use mcutie::homeassistant::binary_sensor::{BinarySensor, BinarySensorClass, BinarySensorState};
+//! const DEVICE_AVAILABILITY_TOPIC: Topic<&'static str> = Topic::Device("status");
+//! const MOTION_STATE_TOPIC: Topic<&'static str> = Topic::Device("motion/status");
+//!
+//! const DEVICE: Device<'static> = Device::new();
+//! const ORIGIN: Origin<'static> = Origin::new();
+//!
+//! const MOTION_SENSOR: Entity<'static, 1, BinarySensor> = Entity {
+//!     device: DEVICE,
+//!     origin: ORIGIN,
+//!     object_id: "motion",
+//!     unique_id: Some("motion"),
+//!     name: "Motion",
+//!     availability: AvailabilityTopics::All([DEVICE_AVAILABILITY_TOPIC]),
+//!     state_topic: Some(MOTION_STATE_TOPIC),
+//!     command_topic: None,
+//!     component: BinarySensor {
+//!         device_class: Some(BinarySensorClass::Motion),
+//!     },
+//! };
+//!
+//! async fn send_discovery_messages() {
+//!     MOTION_SENSOR.publish_discovery().await.unwrap();
+//!     DEVICE_AVAILABILITY_TOPIC.with_bytes(AvailabilityState::Online).publish().await.unwrap();
+//! }
+//!
+//! async fn send_state(state: BinarySensorState) {
+//!     MOTION_SENSOR.publish_state(state).await.unwrap();
+//! }
+//! ```
+use core::{future::Future, ops::Deref};
+
+use mqttrs::QoS;
+use serde::{
+    ser::{Error as _, SerializeStruct},
+    Serialize, Serializer,
+};
+
+use crate::{
+    device_id, device_type, homeassistant::ser::DiscoverySerializer, io::publish, Error,
+    McutieTask, MqttMessage, Payload, Publishable, Topic, TopicString, DATA_CHANNEL,
+};
+
+pub mod binary_sensor;
+pub mod button;
+pub mod light;
+pub mod sensor;
+mod ser;
+
+const HA_STATUS_TOPIC: Topic<&'static str> = Topic::General("homeassistant/status");
+const STATE_ONLINE: &str = "online";
+const STATE_OFFLINE: &str = "offline";
+
+/// A trait representing a specific type of entity in Home Assistant
+pub trait Component: Serialize {
+    /// The state to publish.
+    type State;
+
+    /// The platform identifier for this entity. Internal.
+    fn platform() -> &'static str;
+
+    /// Publishes this entity's state to the MQTT broker.
+    fn publish_state<T: Deref<Target = str>>(
+        &self,
+        topic: &Topic<T>,
+        state: Self::State,
+    ) -> impl Future<Output = Result<(), Error>>;
+}
+
+impl<'t, T, L, const S: usize> McutieTask<'t, T, L, S>
+where
+    T: Deref<Target = str> + 't,
+    L: Publishable + 't,
+{
+    pub(super) async fn ha_after_connected(&self) {
+        let _ = HA_STATUS_TOPIC.subscribe(false).await;
+    }
+
+    pub(super) async fn ha_handle_update(
+        &self,
+        topic: &Topic<TopicString>,
+        payload: &Payload,
+    ) -> bool {
+        if topic == &HA_STATUS_TOPIC {
+            if payload.as_ref() == STATE_ONLINE.as_bytes() {
+                DATA_CHANNEL.send(MqttMessage::HomeAssistantOnline).await;
+            }
+
+            true
+        } else {
+            false
+        }
+    }
+}
+
+impl<T: Deref<Target = str>> Serialize for Topic<T> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        let mut topic = TopicString::new();
+        self.to_string(&mut topic)
+            .map_err(|_| S::Error::custom("topic was too large to serialize"))?;
+        serializer.serialize_str(&topic)
+    }
+}
+
+fn name_or_device<S>(name: &Option<&str>, serializer: S) -> Result<S::Ok, S::Error>
+where
+    S: Serializer,
+{
+    serializer.serialize_str(name.unwrap_or_else(|| device_type()))
+}
+
+/// Represents the device in Home Assistant.
+///
+/// Can just be the default in which case useful properties such as the ID are
+/// automatically included.
+#[derive(Clone, Copy, Default)]
+pub struct Device<'a> {
+    /// A name to identify the device. If not provided the default device type is
+    /// used.
+    pub name: Option<&'a str>,
+    /// An optional configuration URL for the device.
+    pub configuration_url: Option<&'a str>,
+}
+
+impl Device<'_> {
+    /// Creates a new default device.
+    pub const fn new() -> Self {
+        Self {
+            name: None,
+            configuration_url: None,
+        }
+    }
+}
+
+impl Serialize for Device<'_> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let mut len = 2;
+        if self.configuration_url.is_some() {
+            len += 1;
+        }
+
+        let mut serializer = serializer.serialize_struct("Device", len)?;
+
+        serializer.serialize_field("name", self.name.unwrap_or_else(|| device_type()))?;
+        serializer.serialize_field("ids", device_id())?;
+
+        if let Some(cu) = self.configuration_url {
+            serializer.serialize_field("cu", cu)?;
+        } else {
+            serializer.skip_field("cu")?;
+        }
+
+        serializer.end()
+    }
+}
+
+/// Represents the device's origin in Home Assistant.
+///
+/// Can just be the default in which case useful properties are automatically
+/// included.
+#[derive(Clone, Copy, Default, Serialize)]
+pub struct Origin<'a> {
+    /// A name to identify the device's origin. If not provided the default
+    /// device type is used.
+    #[serde(serialize_with = "name_or_device")]
+    pub name: Option<&'a str>,
+}
+
+impl Origin<'_> {
+    /// Creates a new default origin.
+    pub const fn new() -> Self {
+        Self { name: None }
+    }
+}
+
+/// A single entity for Home Assistant.
+///
+/// Calling [`Entity::publish_discovery`] will publish the discovery message to
+/// allow Home Assistant to detect this entity. Read the
+/// [Home Assistant MQTT docs](https://www.home-assistant.io/integrations/mqtt/)
+/// for information on what some of these properties mean.
+pub struct Entity<'a, const A: usize, C: Component> {
+    /// The device this entity is a part of.
+    pub device: Device<'a>,
+    /// The origin of the device.
+    pub origin: Origin<'a>,
+    /// An object identifier to allow for entity ID customisation in Home Assistant.
+    pub object_id: &'a str,
+    /// An optional unique identifier for the entity.
+    pub unique_id: Option<&'a str>,
+    /// A friendly name for the entity.
+    pub name: &'a str,
+    /// Specifies the availability topics that Home Assistant will listen to to
+    /// determine this entity's availability.
+    pub availability: AvailabilityTopics<'a, A>,
+    /// The state topic that this entity's state is published to.
+    pub state_topic: Option<Topic<&'a str>>,
+    /// The command topic that this entity receives commands from.
+    pub command_topic: Option<Topic<&'a str>>,
+    /// The specific entity.
+    pub component: C,
+}
+
+impl<const A: usize, C: Component> Entity<'_, A, C> {
+    /// Publishes the discovery message for this entity to the broker.
+    pub async fn publish_discovery(&self) -> Result<(), Error> {
+        let mut topic = TopicString::new();
+        topic
+            .push_str(option_env!("HA_DISCOVERY_PREFIX").unwrap_or("homeassistant"))
+            .map_err(|_| Error::TooLarge)?;
+        topic.push('/').map_err(|_| Error::TooLarge)?;
+        topic.push_str(C::platform()).map_err(|_| Error::TooLarge)?;
+        topic.push('/').map_err(|_| Error::TooLarge)?;
+        topic
+            .push_str(self.object_id)
+            .map_err(|_| Error::TooLarge)?;
+        topic.push_str("/config").map_err(|_| Error::TooLarge)?;
+
+        let mut payload = Payload::new();
+        payload.serialize_json(self).map_err(|_| Error::TooLarge)?;
+
+        publish(&topic, &payload, QoS::AtMostOnce, false).await
+    }
+
+    /// Publishes this entity's state to the broker.
+    ///
+    /// # Errors
+    ///
+    /// - [`Error::Invalid`] if the entity doesn't have a state topic.
+    pub async fn publish_state(&self, state: C::State) -> Result<(), Error> {
+        if let Some(topic) = self.state_topic {
+            self.component.publish_state(&topic, state).await
+        } else {
+            Err(Error::Invalid)
+        }
+    }
+}
+
+/// A payload representing a device or entity's availability.
+#[allow(missing_docs)]
+pub enum AvailabilityState {
+    Online,
+    Offline,
+}
+
+impl AsRef<[u8]> for AvailabilityState {
+    fn as_ref(&self) -> &'static [u8] {
+        match self {
+            Self::Online => STATE_ONLINE.as_bytes(),
+            Self::Offline => STATE_OFFLINE.as_bytes(),
+        }
+    }
+}
+
+/// The availiabity topics that home assistant will use to determine an entity's
+/// availability.
+pub enum AvailabilityTopics<'a, const A: usize> {
+    /// The entity is always available.
+    None,
+    /// The entity is available if all of the topics are publishes as online.
+    All([Topic<&'a str>; A]),
+    /// The entity is available if any of the topics are publishes as online.
+    Any([Topic<&'a str>; A]),
+    /// The entity is available based on the most recent of the topics to
+    /// publish state.
+    Latest([Topic<&'a str>; A]),
+}
+
+impl<const A: usize, C: Component> Serialize for Entity<'_, A, C> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let outer = DiscoverySerializer {
+            discovery: self,
+            inner: serializer,
+        };
+
+        self.component.serialize(outer)
+    }
+}
diff --git a/Software/MainBoard/rust/src/mcutie_3_0_0/homeassistant/sensor.rs b/Software/MainBoard/rust/src/mcutie_3_0_0/homeassistant/sensor.rs
new file mode 100644
index 0000000..bf48ecb
--- /dev/null
+++ b/Software/MainBoard/rust/src/mcutie_3_0_0/homeassistant/sensor.rs
@@ -0,0 +1,103 @@
+//! Tools for publishing a [Home Assistant sensor](https://www.home-assistant.io/integrations/sensor.mqtt/).
+use core::ops::Deref;
+
+use serde::Serialize;
+
+use crate::{homeassistant::Component, Error, Publishable, Topic};
+
+/// The type of sensor.
+#[derive(Serialize)]
+#[serde(rename_all = "snake_case")]
+#[allow(missing_docs)]
+pub enum SensorClass {
+    ApparentPower,
+    Aqi,
+    AtmosphericPressure,
+    Battery,
+    CarbonDioxide,
+    CarbonMonoxide,
+    Current,
+    DataRate,
+    DataSize,
+    Date,
+    Distance,
+    Duration,
+    Energy,
+    EnergyStorage,
+    Enum,
+    Frequency,
+    Gas,
+    Humidity,
+    Illuminance,
+    Irradiance,
+    Moisture,
+    Monetary,
+    NitrogenDioxide,
+    NitrogenMonoxide,
+    NitrousOxide,
+    Ozone,
+    Ph,
+    Pm1,
+    Pm25,
+    Pm10,
+    PowerFactor,
+    Power,
+    Precipitation,
+    PrecipitationIntensity,
+    Pressure,
+    ReactivePower,
+    SignalStrength,
+    SoundPressure,
+    Speed,
+    SulphurDioxide,
+    Temperature,
+    Timestamp,
+    VolatileOrganicCompounds,
+    VolatileOrganicCompoundsParts,
+    Voltage,
+    Volume,
+    VolumeFlowRate,
+    VolumeStorage,
+    Water,
+    Weight,
+    WindSpeed,
+}
+
+/// The type of measurement that this entity publishes.
+#[derive(Serialize)]
+#[serde(rename_all = "snake_case")]
+pub enum SensorStateClass {
+    /// A measurement at a singe point in time.
+    Measurement,
+    /// A cumulative total that can increase or decrease over time.
+    Total,
+    /// A cumulative total that can only increase.
+    TotalIncreasing,
+}
+
+/// A binary sensor that can publish a [`f32`] value.
+#[derive(Serialize)]
+pub struct Sensor<'u> {
+    /// The type of sensor.
+    pub device_class: Option<SensorClass>,
+    /// The type of measurement that this sensor reports.
+    pub state_class: Option<SensorStateClass>,
+    /// The unit of measurement for this sensor.
+    pub unit_of_measurement: Option<&'u str>,
+}
+
+impl Component for Sensor<'_> {
+    type State = f32;
+
+    fn platform() -> &'static str {
+        "sensor"
+    }
+
+    async fn publish_state<T: Deref<Target = str>>(
+        &self,
+        topic: &Topic<T>,
+        state: Self::State,
+    ) -> Result<(), Error> {
+        topic.with_display(state).publish().await
+    }
+}
diff --git a/Software/MainBoard/rust/src/mcutie_3_0_0/homeassistant/ser.rs b/Software/MainBoard/rust/src/mcutie_3_0_0/homeassistant/ser.rs
new file mode 100644
index 0000000..80e99d9
--- /dev/null
+++ b/Software/MainBoard/rust/src/mcutie_3_0_0/homeassistant/ser.rs
@@ -0,0 +1,333 @@
+use core::ops::Deref;
+
+use serde::{
+    ser::{SerializeSeq, SerializeStruct},
+    Serialize, Serializer,
+};
+
+use crate::{
+    homeassistant::{AvailabilityTopics, Component, Entity},
+    Topic,
+};
+
+#[derive(Serialize)]
+pub(super) struct AvailabilityTopicItem<'a> {
+    topic: Topic<&'a str>,
+}
+
+struct AvailabilityTopicList<'a, T: Deref<Target = str>, const N: usize> {
+    list: &'a [Topic<T>; N],
+}
+
+impl<'a, const N: usize, T: Deref<Target = str>> AvailabilityTopicList<'a, T, N> {
+    pub(super) fn new(list: &'a [Topic<T>; N]) -> Self {
+        Self { list }
+    }
+}
+
+impl<T: Deref<Target = str>, const N: usize> Serialize for AvailabilityTopicList<'_, T, N> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let mut serializer = serializer.serialize_seq(Some(N))?;
+
+        for topic in self.list {
+            serializer.serialize_element(&AvailabilityTopicItem {
+                topic: topic.as_ref(),
+            })?;
+        }
+
+        serializer.end()
+    }
+}
+
+pub(super) struct List<'a, T: Serialize, const N: usize> {
+    list: &'a [T; N],
+}
+
+impl<'a, T: Serialize, const N: usize> List<'a, T, N> {
+    pub(super) fn new(list: &'a [T; N]) -> Self {
+        Self { list }
+    }
+}
+
+impl<T: Serialize, const N: usize> Serialize for List<'_, T, N> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let mut serializer = serializer.serialize_seq(Some(N))?;
+
+        for item in self.list {
+            serializer.serialize_element(item)?;
+        }
+
+        serializer.end()
+    }
+}
+
+pub(super) struct DiscoverySerializer<'a, const A: usize, C: Component, S: Serializer> {
+    pub(super) discovery: &'a Entity<'a, A, C>,
+    pub(super) inner: S,
+}
+
+impl<const A: usize, C: Component, S: Serializer> Serializer for DiscoverySerializer<'_, A, C, S> {
+    type Ok = S::Ok;
+    type Error = S::Error;
+    type SerializeSeq = S::SerializeSeq;
+    type SerializeTuple = S::SerializeTuple;
+    type SerializeTupleStruct = S::SerializeTupleStruct;
+    type SerializeTupleVariant = S::SerializeTupleVariant;
+    type SerializeMap = S::SerializeMap;
+    type SerializeStruct = S::SerializeStruct;
+    type SerializeStructVariant = S::SerializeStructVariant;
+
+    fn serialize_struct(
+        self,
+        name: &'static str,
+        mut len: usize,
+    ) -> Result<Self::SerializeStruct, Self::Error> {
+        len += 5;
+        if self.discovery.state_topic.is_some() {
+            len += 1;
+        }
+        if self.discovery.command_topic.is_some() {
+            len += 1;
+        }
+        if self.discovery.unique_id.is_some() {
+            len += 1;
+        }
+        if !matches!(self.discovery.availability, AvailabilityTopics::None) {
+            len += 2;
+        }
+
+        let mut serializer = self.inner.serialize_struct(name, len)?;
+
+        serializer.serialize_field("dev", &self.discovery.device)?;
+        serializer.serialize_field("o", &self.discovery.origin)?;
+        serializer.serialize_field("p", C::platform())?;
+        serializer.serialize_field("obj_id", self.discovery.object_id)?;
+
+        serializer.serialize_field("name", self.discovery.name)?;
+
+        if let Some(t) = self.discovery.state_topic {
+            serializer.serialize_field("stat_t", &t)?;
+        } else {
+            serializer.skip_field("stat_t")?;
+        }
+
+        if let Some(t) = self.discovery.command_topic {
+            serializer.serialize_field("cmd_t", &t)?;
+        } else {
+            serializer.skip_field("cmd_t")?;
+        }
+
+        match &self.discovery.availability {
+            AvailabilityTopics::None => {
+                serializer.skip_field("avty")?;
+                serializer.skip_field("avty_mode")?;
+            }
+            AvailabilityTopics::All(topics) => {
+                serializer.serialize_field("avty_mode", "all")?;
+                serializer.serialize_field("avty", &AvailabilityTopicList::new(topics))?;
+            }
+            AvailabilityTopics::Any(topics) => {
+                serializer.serialize_field("avty_mode", "any")?;
+                serializer.serialize_field("avty", &AvailabilityTopicList::new(topics))?;
+            }
+            AvailabilityTopics::Latest(topics) => {
+                serializer.serialize_field("avty_mode", "latest")?;
+                serializer.serialize_field("avty", &AvailabilityTopicList::new(topics))?;
+            }
+        }
+
+        if let Some(v) = self.discovery.unique_id {
+            serializer.serialize_field("uniq_id", v)?;
+        } else {
+            serializer.skip_field("uniq_id")?;
+        }
+
+        Ok(serializer)
+    }
+
+    fn serialize_bool(self, _: bool) -> Result<Self::Ok, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_i8(self, _: i8) -> Result<Self::Ok, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_i16(self, _: i16) -> Result<Self::Ok, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_i32(self, _: i32) -> Result<Self::Ok, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_i64(self, _: i64) -> Result<Self::Ok, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_u8(self, _: u8) -> Result<Self::Ok, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_u16(self, _: u16) -> Result<Self::Ok, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_u32(self, _: u32) -> Result<Self::Ok, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_u64(self, _: u64) -> Result<Self::Ok, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_f32(self, _: f32) -> Result<Self::Ok, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_f64(self, _: f64) -> Result<Self::Ok, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_char(self, _: char) -> Result<Self::Ok, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_str(self, _: &str) -> Result<Self::Ok, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_bytes(self, _: &[u8]) -> Result<Self::Ok, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_none(self) -> Result<Self::Ok, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_some<T>(self, _: &T) -> Result<Self::Ok, Self::Error>
+    where
+        T: ?Sized + Serialize,
+    {
+        unimplemented!()
+    }
+
+    fn serialize_unit(self) -> Result<Self::Ok, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_unit_struct(self, _: &'static str) -> Result<Self::Ok, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_unit_variant(
+        self,
+        _: &'static str,
+        _: u32,
+        _: &'static str,
+    ) -> Result<Self::Ok, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_newtype_struct<T>(self, _: &'static str, _: &T) -> Result<Self::Ok, Self::Error>
+    where
+        T: ?Sized + Serialize,
+    {
+        unimplemented!()
+    }
+
+    fn serialize_newtype_variant<T>(
+        self,
+        _: &'static str,
+        _: u32,
+        _: &'static str,
+        _: &T,
+    ) -> Result<Self::Ok, Self::Error>
+    where
+        T: ?Sized + Serialize,
+    {
+        unimplemented!()
+    }
+
+    fn serialize_seq(self, _: Option<usize>) -> Result<Self::SerializeSeq, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_tuple(self, _: usize) -> Result<Self::SerializeTuple, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_tuple_struct(
+        self,
+        _: &'static str,
+        _: usize,
+    ) -> Result<Self::SerializeTupleStruct, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_tuple_variant(
+        self,
+        _: &'static str,
+        _: u32,
+        _: &'static str,
+        _: usize,
+    ) -> Result<Self::SerializeTupleVariant, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_map(self, _: Option<usize>) -> Result<Self::SerializeMap, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_struct_variant(
+        self,
+        _: &'static str,
+        _: u32,
+        _: &'static str,
+        _: usize,
+    ) -> Result<Self::SerializeStructVariant, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_i128(self, _: i128) -> Result<Self::Ok, Self::Error> {
+        unimplemented!()
+    }
+
+    fn serialize_u128(self, _: u128) -> Result<Self::Ok, Self::Error> {
+        unimplemented!()
+    }
+
+    fn collect_seq<I>(self, _: I) -> Result<Self::Ok, Self::Error>
+    where
+        I: IntoIterator,
+        <I as IntoIterator>::Item: Serialize,
+    {
+        unimplemented!()
+    }
+
+    fn collect_map<K, V, I>(self, _: I) -> Result<Self::Ok, Self::Error>
+    where
+        K: Serialize,
+        V: Serialize,
+        I: IntoIterator<Item = (K, V)>,
+    {
+        unimplemented!()
+    }
+
+    fn collect_str<T>(self, _: &T) -> Result<Self::Ok, Self::Error>
+    where
+        T: ?Sized + core::fmt::Display,
+    {
+        unimplemented!()
+    }
+
+    fn is_human_readable(&self) -> bool {
+        unimplemented!()
+    }
+}
diff --git a/Software/MainBoard/rust/src/mcutie_3_0_0/io.rs b/Software/MainBoard/rust/src/mcutie_3_0_0/io.rs
new file mode 100644
index 0000000..0ca402b
--- /dev/null
+++ b/Software/MainBoard/rust/src/mcutie_3_0_0/io.rs
@@ -0,0 +1,483 @@
+use core::ops::Deref;
+
+pub(crate) use atomic16::assign_pid;
+use embassy_futures::select::{select, select4, Either};
+use embassy_net::{
+    dns::DnsQueryType,
+    tcp::{TcpReader, TcpSocket, TcpWriter},
+    Stack,
+};
+use embassy_sync::{
+    blocking_mutex::raw::CriticalSectionRawMutex,
+    pubsub::{PubSubChannel, Subscriber, WaitResult},
+};
+use embassy_time::Timer;
+use embedded_io_async::Write;
+use mqttrs::{
+    decode_slice, Connect, ConnectReturnCode, LastWill, Packet, Pid, Protocol, Publish, QoS, QosPid,
+};
+
+use crate::{
+    device_id, fmt::Debug2Format, pipe::ConnectedPipe, ControlMessage, Error, MqttMessage, Payload,
+    Publishable, Topic, TopicString, CONFIRMATION_TIMEOUT, DATA_CHANNEL, DEFAULT_BACKOFF,
+    RESET_BACKOFF,
+};
+
+static SEND_QUEUE: ConnectedPipe<CriticalSectionRawMutex, Payload, 10> = ConnectedPipe::new();
+
+pub(crate) static CONTROL_CHANNEL: PubSubChannel<CriticalSectionRawMutex, ControlMessage, 2, 5, 0> =
+    PubSubChannel::new();
+
+type ControlSubscriber = Subscriber<'static, CriticalSectionRawMutex, ControlMessage, 2, 5, 0>;
+
+pub(crate) async fn subscribe() -> ControlSubscriber {
+    loop {
+        if let Ok(sub) = CONTROL_CHANNEL.subscriber() {
+            return sub;
+        }
+
+        Timer::after_millis(50).await;
+    }
+}
+
+#[cfg(target_has_atomic = "16")]
+mod atomic16 {
+    use core::sync::atomic::{AtomicU16, Ordering};
+
+    use mqttrs::Pid;
+
+    static PID: AtomicU16 = AtomicU16::new(0);
+
+    pub(crate) async fn assign_pid() -> Pid {
+        Pid::new() + PID.fetch_add(1, Ordering::SeqCst)
+    }
+}
+
+#[cfg(not(target_has_atomic = "16"))]
+mod atomic16 {
+    use embassy_sync::{blocking_mutex::raw::CriticalSectionRawMutex, mutex::Mutex};
+    use mqttrs::Pid;
+
+    static PID_MUTEX: Mutex<CriticalSectionRawMutex, u16> = Mutex::new(0);
+
+    pub(crate) async fn assign_pid() -> Pid {
+        let mut locked = PID_MUTEX.lock().await;
+        *locked += 1;
+
+        Pid::new() + *locked
+    }
+}
+
+pub(crate) async fn send_packet(packet: Packet<'_>) -> Result<(), Error> {
+    let mut buffer = Payload::new();
+
+    match buffer.encode_packet(&packet) {
+        Ok(()) => {
+            debug!(
+                "Sending packet to broker: {:?}",
+                Debug2Format(&packet.get_type())
+            );
+            SEND_QUEUE.push(buffer).await;
+            Ok(())
+        }
+        Err(_) => {
+            error!("Failed to send packet");
+            Err(Error::PacketError)
+        }
+    }
+}
+
+pub(crate) async fn wait_for_publish(
+    mut subscriber: ControlSubscriber,
+    expected_pid: Pid,
+) -> Result<(), Error> {
+    match select(
+        async {
+            loop {
+                match subscriber.next_message().await {
+                    WaitResult::Lagged(_) => {
+                        // Maybe we missed the message?
+                    }
+                    WaitResult::Message(ControlMessage::Published(published_pid)) => {
+                        if published_pid == expected_pid {
+                            return Ok(());
+                        }
+                    }
+                    _ => {}
+                }
+            }
+        },
+        Timer::after_millis(CONFIRMATION_TIMEOUT),
+    )
+    .await
+    {
+        Either::First(r) => r,
+        Either::Second(_) => Err(Error::TimedOut),
+    }
+}
+
+pub(crate) async fn publish(
+    topic_name: &str,
+    payload: &[u8],
+    qos: QoS,
+    retain: bool,
+) -> Result<(), Error> {
+    let subscriber = subscribe().await;
+
+    let (qospid, pid) = match qos {
+        QoS::AtMostOnce => (QosPid::AtMostOnce, None),
+        QoS::AtLeastOnce => {
+            let pid = assign_pid().await;
+            (QosPid::AtLeastOnce(pid), Some(pid))
+        }
+        QoS::ExactlyOnce => {
+            let pid = assign_pid().await;
+            (QosPid::ExactlyOnce(pid), Some(pid))
+        }
+    };
+
+    let packet = Packet::Publish(Publish {
+        dup: false,
+        qospid,
+        retain,
+        topic_name,
+        payload,
+    });
+
+    send_packet(packet).await?;
+
+    if let Some(expected_pid) = pid {
+        wait_for_publish(subscriber, expected_pid).await
+    } else {
+        Ok(())
+    }
+}
+
+fn packet_size(buffer: &[u8]) -> Option<usize> {
+    let mut pos = 1;
+    let mut multiplier = 1;
+    let mut value = 0;
+
+    while pos < buffer.len() {
+        value += (buffer[pos] & 127) as usize * multiplier;
+        multiplier *= 128;
+
+        if (buffer[pos] & 128) == 0 {
+            return Some(value + pos + 1);
+        }
+
+        pos += 1;
+        if pos == 5 {
+            return Some(0);
+        }
+    }
+
+    None
+}
+
+/// The MQTT task that must be run in order for the stack to operate.
+pub struct McutieTask<'t, T, L, const S: usize>
+where
+    T: Deref<Target = str> + 't,
+    L: Publishable + 't,
+{
+    pub(crate) network: Stack<'t>,
+    pub(crate) broker: &'t str,
+    pub(crate) last_will: Option<L>,
+    pub(crate) username: Option<&'t str>,
+    pub(crate) password: Option<&'t str>,
+    pub(crate) subscriptions: [Topic<T>; S],
+    pub(crate) keep_alive: u16
+}
+
+impl<'t, T, L, const S: usize> McutieTask<'t, T, L, S>
+where
+    T: Deref<Target = str> + 't,
+    L: Publishable + 't,
+{
+    #[cfg(not(feature = "homeassistant"))]
+    async fn ha_handle_update(&self, _topic: &Topic<TopicString>, _payload: &Payload) -> bool {
+        false
+    }
+
+    async fn recv_loop(&self, mut reader: TcpReader<'_>) -> Result<(), Error> {
+        let mut buffer = [0_u8; 4096];
+        let mut cursor: usize = 0;
+
+        let controller = CONTROL_CHANNEL.immediate_publisher();
+
+        loop {
+            match reader.read(&mut buffer[cursor..]).await {
+                Ok(0) => {
+                    error!("Receive socket closed");
+                    return Ok(());
+                }
+                Ok(len) => {
+                    cursor += len;
+                }
+                Err(_) => {
+                    error!("I/O failure reading packet");
+                    return Err(Error::IOError);
+                }
+            }
+
+            let mut start_pos = 0;
+            loop {
+                let packet_length = match packet_size(&buffer[start_pos..cursor]) {
+                    Some(0) => {
+                        error!("Invalid MQTT packet");
+                        return Err(Error::PacketError);
+                    }
+                    Some(len) => len,
+                    None => {
+                        // None is returned when there is not yet enough data to decode a packet.
+                        if start_pos != 0 {
+                            // Adjust the buffer to reclaim any unused data
+                            buffer.copy_within(start_pos..cursor, 0);
+                            cursor -= start_pos;
+                        }
+                        break;
+                    }
+                };
+
+                let packet = match decode_slice(&buffer[start_pos..(start_pos + packet_length)]) {
+                    Ok(Some(p)) => p,
+                    Ok(None) => {
+                        error!("Packet length calculation failed.");
+                        return Err(Error::PacketError);
+                    }
+                    Err(_) => {
+                        error!("Invalid MQTT packet");
+                        return Err(Error::PacketError);
+                    }
+                };
+
+                debug!(
+                    "Received packet from broker: {:?}",
+                    Debug2Format(&packet.get_type())
+                );
+
+                match packet {
+                    Packet::Connack(connack) => match connack.code {
+                        ConnectReturnCode::Accepted => {
+                            #[cfg(feature = "homeassistant")]
+                            self.ha_after_connected().await;
+
+                            for topic in &self.subscriptions {
+                                let _ = topic.subscribe(false).await;
+                            }
+
+                            DATA_CHANNEL.send(MqttMessage::Connected).await;
+                        }
+                        _ => {
+                            error!("Connection request to broker was not accepted");
+                            return Err(Error::IOError);
+                        }
+                    },
+                    Packet::Pingresp => {}
+
+                    Packet::Publish(publish) => {
+                        match (
+                            Topic::from_str(publish.topic_name),
+                            Payload::from(publish.payload),
+                        ) {
+                            (Ok(topic), Ok(payload)) => {
+                                if !self.ha_handle_update(&topic, &payload).await {
+                                    DATA_CHANNEL
+                                        .send(MqttMessage::Publish(topic, payload))
+                                        .await;
+                                }
+                            }
+                            _ => {
+                                error!("Unable to process publish data as it was too large");
+                            }
+                        }
+
+                        match publish.qospid {
+                            mqttrs::QosPid::AtMostOnce => {}
+                            mqttrs::QosPid::AtLeastOnce(pid) => {
+                                send_packet(Packet::Puback(pid)).await?;
+                            }
+                            mqttrs::QosPid::ExactlyOnce(pid) => {
+                                send_packet(Packet::Pubrec(pid)).await?;
+                            }
+                        }
+                    }
+                    Packet::Puback(pid) => {
+                        controller.publish_immediate(ControlMessage::Published(pid));
+                    }
+                    Packet::Pubrec(pid) => {
+                        controller.publish_immediate(ControlMessage::Published(pid));
+                        send_packet(Packet::Pubrel(pid)).await?;
+                    }
+                    Packet::Pubrel(pid) => send_packet(Packet::Pubrel(pid)).await?,
+                    Packet::Pubcomp(_) => {}
+
+                    Packet::Suback(suback) => {
+                        if let Some(return_code) = suback.return_codes.first() {
+                            controller.publish_immediate(ControlMessage::Subscribed(
+                                suback.pid,
+                                *return_code,
+                            ));
+                        } else {
+                            warn!("Unexpected suback with no return codes");
+                        }
+                    }
+                    Packet::Unsuback(pid) => {
+                        controller.publish_immediate(ControlMessage::Unsubscribed(pid));
+                    }
+
+                    Packet::Connect(_)
+                    | Packet::Subscribe(_)
+                    | Packet::Pingreq
+                    | Packet::Unsubscribe(_)
+                    | Packet::Disconnect => {
+                        debug!(
+                            "Unexpected packet from broker: {:?}",
+                            Debug2Format(&packet.get_type())
+                        );
+                    }
+                }
+
+                start_pos += packet_length;
+                if start_pos == cursor {
+                    cursor = 0;
+                    break;
+                }
+            }
+        }
+    }
+
+    async fn write_loop(&self, mut writer: TcpWriter<'_>) {
+        let mut buffer = Payload::new();
+
+        let mut last_will_topic = TopicString::new();
+        let mut last_will_payload = Payload::new();
+
+        let last_will = self.last_will.as_ref().and_then(|p| {
+            if p.write_topic(&mut last_will_topic).is_ok()
+                && p.write_payload(&mut last_will_payload).is_ok()
+            {
+                Some(LastWill {
+                    topic: &last_will_topic,
+                    message: &last_will_payload,
+                    qos: p.qos(),
+                    retain: p.retain(),
+                })
+            } else {
+                None
+            }
+        });
+
+        // Send our connection request.
+        if buffer
+            .encode_packet(&Packet::Connect(Connect {
+                protocol: Protocol::MQTT311,
+                keep_alive: self.keep_alive,
+                client_id: device_id(),
+                clean_session: true,
+                last_will,
+                username: self.username,
+                password: self.password.map(|s| s.as_bytes()),
+            }))
+            .is_err()
+        {
+            error!("Failed to encode connection packet");
+            return;
+        }
+
+        if let Err(e) = writer.write_all(&buffer).await {
+            error!("Failed to send connection packet: {:?}", e);
+            return;
+        }
+
+        let reader = SEND_QUEUE.reader();
+
+        loop {
+            let buffer = reader.receive().await;
+
+            trace!("Writer sending packet");
+            if let Err(e) = writer.write_all(&buffer).await {
+                error!("Failed to send data: {:?}", e);
+                return;
+            }
+        }
+    }
+
+    /// Runs the MQTT stack. The future returned from this must be awaited for everything to work.
+    pub async fn run(self) {
+        let mut timeout: Option<u64> = None;
+
+        let mut rx_buffer = [0; 4096];
+        let mut tx_buffer = [0; 4096];
+
+        loop {
+            if let Some(millis) = timeout.replace(DEFAULT_BACKOFF) {
+                Timer::after_millis(millis).await;
+            }
+
+            if !self.network.is_config_up() {
+                debug!("Waiting for network to configure.");
+                self.network.wait_config_up().await;
+                debug!("Network configured.");
+            }
+
+            let ip_addrs = match self.network.dns_query(self.broker, DnsQueryType::A).await {
+                Ok(v) => v,
+                Err(e) => {
+                    error!("Failed to lookup '{}' for broker: {:?}", self.broker, e);
+                    continue;
+                }
+            };
+
+            let ip = match ip_addrs.first() {
+                Some(i) => *i,
+                None => {
+                    error!("No IP address found for broker '{}'", self.broker);
+                    continue;
+                }
+            };
+
+            debug!("Connecting to {}:1883", ip);
+
+            let mut socket = TcpSocket::new(self.network, &mut rx_buffer, &mut tx_buffer);
+            if let Err(e) = socket.connect((ip, 1883)).await {
+                error!("Failed to connect to {}:1883: {:?}", ip, e);
+                continue;
+            }
+
+            info!("Connected to {}", self.broker);
+            timeout = Some(RESET_BACKOFF);
+
+            let (reader, writer) = socket.split();
+
+            let recv_loop = self.recv_loop(reader);
+            let send_loop = self.write_loop(writer);
+
+            let ping_loop = async {
+                loop {
+                    Timer::after_secs(45).await;
+
+                    let _ = send_packet(Packet::Pingreq).await;
+                }
+            };
+
+            let link_down = async {
+                self.network.wait_link_down().await;
+                warn!("Network link lost");
+            };
+
+            let ip_down = async {
+                self.network.wait_config_down().await;
+                warn!("Network config lost");
+            };
+
+            select4(send_loop, ping_loop, recv_loop, select(link_down, ip_down)).await;
+
+            socket.close();
+
+            warn!("Lost connection with broker");
+            DATA_CHANNEL.send(MqttMessage::Disconnected).await;
+        }
+    }
+}
diff --git a/Software/MainBoard/rust/src/mcutie_3_0_0/lib.rs b/Software/MainBoard/rust/src/mcutie_3_0_0/lib.rs
new file mode 100644
index 0000000..126c9af
--- /dev/null
+++ b/Software/MainBoard/rust/src/mcutie_3_0_0/lib.rs
@@ -0,0 +1,227 @@
+#![no_std]
+#![deny(unreachable_pub)]
+#![warn(missing_docs)]
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+//! MQTT client support crate vendored into this repository.
+
+use core::{ops::Deref, str};
+
+pub use buffer::Buffer;
+use embassy_net::{HardwareAddress, Stack};
+use embassy_sync::{blocking_mutex::raw::CriticalSectionRawMutex, channel::Channel};
+use heapless::String;
+pub use io::McutieTask;
+pub use mqttrs::QoS;
+use mqttrs::{Pid, SubscribeReturnCodes};
+use once_cell::sync::OnceCell;
+pub use publish::*;
+pub use topic::Topic;
+
+// This must come first so the macros are visible
+pub(crate) mod fmt;
+
+mod buffer;
+#[cfg(feature = "homeassistant")]
+pub mod homeassistant;
+mod io;
+mod pipe;
+mod publish;
+mod topic;
+
+// This really needs to match that used by mqttrs.
+const TOPIC_LENGTH: usize = 256;
+const PAYLOAD_LENGTH: usize = 2048;
+
+/// A fixed length stack allocated string. The length is fixed by the mqttrs crate.
+pub type TopicString = String<TOPIC_LENGTH>;
+/// A fixed length buffer of 2048 bytes.
+pub type Payload = Buffer<PAYLOAD_LENGTH>;
+
+// By default in the event of an error connecting to the broker we will wait for 5s.
+const DEFAULT_BACKOFF: u64 = 5000;
+// If the connection dropped then re-connect more quickly.
+const RESET_BACKOFF: u64 = 200;
+// How long to wait for the broker to confirm actions.
+const CONFIRMATION_TIMEOUT: u64 = 2000;
+
+static DATA_CHANNEL: Channel<CriticalSectionRawMutex, MqttMessage, 10> = Channel::new();
+
+static DEVICE_TYPE: OnceCell<String<32>> = OnceCell::new();
+static DEVICE_ID: OnceCell<String<32>> = OnceCell::new();
+
+fn device_id() -> &'static str {
+    DEVICE_ID.get().unwrap()
+}
+
+fn device_type() -> &'static str {
+    DEVICE_TYPE.get().unwrap()
+}
+
+/// Various errors
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
+pub enum Error {
+    /// An IO error occured.
+    IOError,
+    /// The operation timed out.
+    TimedOut,
+    /// An attempt was made to encode something too large.
+    TooLarge,
+    /// A packet or payload could not be decoded or encoded.
+    PacketError,
+    /// An invalid or unsupported operation was attempted.
+    Invalid,
+    /// A value was rejected.
+    Rejected,
+}
+
+#[allow(clippy::large_enum_variant)]
+/// A message from the MQTT broker.
+pub enum MqttMessage {
+    /// The broker has been connected to successfully. Generally in response to this message a
+    /// device should subscribe to topics of interest and send out any device state.
+    Connected,
+    /// New data received from the broker.
+    Publish(Topic<TopicString>, Payload),
+    /// The connection to the broker has been dropped.
+    Disconnected,
+    /// Home Assistant has come online and you should send any discovery messages.
+    #[cfg(feature = "homeassistant")]
+    HomeAssistantOnline,
+}
+
+#[derive(Clone)]
+enum ControlMessage {
+    Published(Pid),
+    Subscribed(Pid, SubscribeReturnCodes),
+    Unsubscribed(Pid),
+}
+
+/// Receives messages from the broker.
+pub struct McutieReceiver;
+
+impl McutieReceiver {
+    /// Waits for the next message from the broker.
+    pub async fn receive(&self) -> MqttMessage {
+        DATA_CHANNEL.receive().await
+    }
+}
+
+/// A builder to configure the MQTT stack.
+pub struct McutieBuilder<'t, T, L, const S: usize>
+where
+    T: Deref<Target = str> + 't,
+    L: Publishable + 't,
+{
+    network: Stack<'t>,
+    device_type: &'t str,
+    device_id: Option<&'t str>,
+    broker: &'t str,
+    last_will: Option<L>,
+    username: Option<&'t str>,
+    password: Option<&'t str>,
+    subscriptions: [Topic<T>; S],
+}
+
+impl<'t, T: Deref<Target = str> + 't, L: Publishable + 't> McutieBuilder<'t, T, L, 0> {
+    /// Creates a new builder with the initial required configuration.
+    ///
+    /// `device_type` is expected to be the same for all devices of the same type.
+    /// `broker` may be an IP address or a DNS name for the broker to connect to.
+    pub fn new(network: Stack<'t>, device_type: &'t str, broker: &'t str) -> Self {
+        Self {
+            network,
+            device_type,
+            broker,
+            device_id: None,
+            last_will: None,
+            username: None,
+            password: None,
+            subscriptions: [],
+        }
+    }
+}
+
+impl<'t, T: Deref<Target = str> + 't, L: Publishable + 't, const S: usize>
+    McutieBuilder<'t, T, L, S>
+{
+    /// Add some default topics to subscribe to.
+    pub fn with_subscriptions<const N: usize>(
+        self,
+        subscriptions: [Topic<T>; N],
+    ) -> McutieBuilder<'t, T, L, N> {
+        McutieBuilder {
+            network: self.network,
+            device_type: self.device_type,
+            broker: self.broker,
+            device_id: self.device_id,
+            last_will: self.last_will,
+            username: self.username,
+            password: self.password,
+            subscriptions,
+        }
+    }
+}
+
+impl<'t, T: Deref<Target = str> + 't, L: Publishable + 't, const S: usize>
+    McutieBuilder<'t, T, L, S>
+{
+    /// Adds authentication for the broker.
+    pub fn with_authentication(self, username: &'t str, password: &'t str) -> Self {
+        Self {
+            username: Some(username),
+            password: Some(password),
+            ..self
+        }
+    }
+
+    /// Sets a last will message to be published in the event of disconnection.
+    pub fn with_last_will(self, last_will: L) -> Self {
+        Self {
+            last_will: Some(last_will),
+            ..self
+        }
+    }
+
+    /// Sets a custom unique device identifier. If none is set then the network
+    /// MAC address is used.
+    pub fn with_device_id(self, device_id: &'t str) -> Self {
+        Self {
+            device_id: Some(device_id),
+            ..self
+        }
+    }
+
+    /// Initialises the MQTT stack returning a receiver for listening to
+    /// messages from the broker and a future that must be run in order for the
+    /// stack to operate.
+    pub fn build(self, keep_alive: u16) -> (McutieReceiver, McutieTask<'t, T, L, S>) {
+        let mut dtype = String::<32>::new();
+        dtype.push_str(self.device_type).unwrap();
+        DEVICE_TYPE.set(dtype).unwrap();
+
+        let mut did = String::<32>::new();
+        if let Some(device_id) = self.device_id {
+            did.push_str(device_id).unwrap();
+        } else if let HardwareAddress::Ethernet(address) = self.network.hardware_address() {
+            let mut buffer = [0_u8; 12];
+            hex::encode_to_slice(address.as_bytes(), &mut buffer).unwrap();
+            did.push_str(str::from_utf8(&buffer).unwrap()).unwrap();
+        }
+
+        DEVICE_ID.set(did).unwrap();
+
+        (
+            McutieReceiver {},
+            McutieTask {
+                network: self.network,
+                broker: self.broker,
+                last_will: self.last_will,
+                username: self.username,
+                password: self.password,
+                subscriptions: self.subscriptions,
+                keep_alive
+            },
+        )
+    }
+}
diff --git a/Software/MainBoard/rust/src/mcutie_3_0_0/pipe.rs b/Software/MainBoard/rust/src/mcutie_3_0_0/pipe.rs
new file mode 100644
index 0000000..9df156f
--- /dev/null
+++ b/Software/MainBoard/rust/src/mcutie_3_0_0/pipe.rs
@@ -0,0 +1,267 @@
+use core::{
+    cell::RefCell,
+    future::Future,
+    pin::Pin,
+    task::{Context, Poll, Waker},
+};
+
+use embassy_sync::blocking_mutex::{raw::RawMutex, Mutex};
+use pin_project::pin_project;
+
+struct PipeData<T, const N: usize> {
+    connect_count: usize,
+    receiver_waker: Option<Waker>,
+    sender_waker: Option<Waker>,
+    pending: Option<T>,
+}
+
+fn swap_wakers(waker: &mut Option<Waker>, new_waker: &Waker) {
+    if let Some(old_waker) = waker.take() {
+        if old_waker.will_wake(new_waker) {
+            *waker = Some(old_waker)
+        } else {
+            if !new_waker.will_wake(&old_waker) {
+                old_waker.wake();
+            }
+
+            *waker = Some(new_waker.clone());
+        }
+    } else {
+        *waker = Some(new_waker.clone())
+    }
+}
+
+pub(crate) struct ReceiveFuture<'a, M: RawMutex, T, const N: usize> {
+    pipe: &'a ConnectedPipe<M, T, N>,
+}
+
+impl<M: RawMutex, T, const N: usize> Future for ReceiveFuture<'_, M, T, N> {
+    type Output = T;
+
+    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        self.pipe.inner.lock(|cell| {
+            let mut inner = cell.borrow_mut();
+
+            if let Some(waker) = inner.sender_waker.take() {
+                waker.wake();
+            }
+
+            if let Some(item) = inner.pending.take() {
+                if let Some(old_waker) = inner.receiver_waker.take() {
+                    old_waker.wake();
+                }
+
+                Poll::Ready(item)
+            } else {
+                swap_wakers(&mut inner.receiver_waker, cx.waker());
+                Poll::Pending
+            }
+        })
+    }
+}
+
+pub(crate) struct PipeReader<'a, M: RawMutex, T, const N: usize> {
+    pipe: &'a ConnectedPipe<M, T, N>,
+}
+
+impl<M: RawMutex, T, const N: usize> PipeReader<'_, M, T, N> {
+    #[must_use]
+    pub(crate) fn receive(&self) -> ReceiveFuture<'_, M, T, N> {
+        ReceiveFuture { pipe: self.pipe }
+    }
+}
+
+impl<M: RawMutex, T, const N: usize> Drop for PipeReader<'_, M, T, N> {
+    fn drop(&mut self) {
+        self.pipe.inner.lock(|cell| {
+            let mut inner = cell.borrow_mut();
+            inner.connect_count -= 1;
+
+            if inner.connect_count == 0 {
+                inner.pending = None;
+            }
+
+            if let Some(waker) = inner.sender_waker.take() {
+                waker.wake();
+            }
+        })
+    }
+}
+
+#[pin_project]
+pub(crate) struct PushFuture<'a, M: RawMutex, T, const N: usize> {
+    data: Option<T>,
+    pipe: &'a ConnectedPipe<M, T, N>,
+}
+
+impl<M: RawMutex, T, const N: usize> Future for PushFuture<'_, M, T, N> {
+    type Output = ();
+
+    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        self.pipe.inner.lock(|cell| {
+            let project = self.project();
+            let mut inner = cell.borrow_mut();
+
+            if let Some(receiver) = inner.receiver_waker.take() {
+                receiver.wake();
+            }
+
+            if project.data.is_none() || inner.connect_count == 0 {
+                trace!("Dropping packet");
+                Poll::Ready(())
+            } else if inner.pending.is_some() {
+                swap_wakers(&mut inner.sender_waker, cx.waker());
+                Poll::Pending
+            } else {
+                inner.pending = project.data.take();
+
+                Poll::Ready(())
+            }
+        })
+    }
+}
+
+/// A pipe that knows whether a receiver is connected. If so pushing to the
+/// queue waits until there is space in the queue, otherwise data is simply
+/// dropped.
+pub(crate) struct ConnectedPipe<M: RawMutex, T, const N: usize> {
+    inner: Mutex<M, RefCell<PipeData<T, N>>>,
+}
+
+impl<M: RawMutex, T, const N: usize> ConnectedPipe<M, T, N> {
+    pub(crate) const fn new() -> Self {
+        Self {
+            inner: Mutex::new(RefCell::new(PipeData {
+                connect_count: 0,
+                receiver_waker: None,
+                sender_waker: None,
+                pending: None,
+            })),
+        }
+    }
+
+    /// A future that waits for a new item to be available.
+    pub(crate) fn reader(&self) -> PipeReader<'_, M, T, N> {
+        self.inner.lock(|cell| {
+            let mut inner = cell.borrow_mut();
+            inner.connect_count += 1;
+
+            PipeReader { pipe: self }
+        })
+    }
+
+    /// Pushes an item to the reader, waiting for a slot to become available if
+    /// connected.
+    #[must_use]
+    pub(crate) fn push(&self, data: T) -> PushFuture<'_, M, T, N> {
+        PushFuture {
+            data: Some(data),
+            pipe: self,
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use core::time::Duration;
+
+    use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
+    use futures_executor::{LocalPool, ThreadPool};
+    use futures_timer::Delay;
+    use futures_util::{future::select, pin_mut, task::SpawnExt, FutureExt};
+
+    use super::ConnectedPipe;
+
+    async fn wait_milis(milis: u64) {
+        Delay::new(Duration::from_millis(milis)).await;
+    }
+
+    // #[futures_test::test]
+    #[test]
+    fn test_send_receive() {
+        let mut executor = LocalPool::new();
+        let spawner = executor.spawner();
+
+        static PIPE: ConnectedPipe<CriticalSectionRawMutex, usize, 5> = ConnectedPipe::new();
+
+        // Task that sends
+        spawner
+            .spawn(async {
+                wait_milis(10).await;
+
+                PIPE.push(23).await;
+                PIPE.push(56).await;
+                PIPE.push(67).await;
+            })
+            .unwrap();
+
+        // Task that receives
+        spawner
+            .spawn(async {
+                let reader = PIPE.reader();
+                let value = reader.receive().await;
+                assert_eq!(value, 23);
+                let value = reader.receive().await;
+                assert_eq!(value, 56);
+                let value = reader.receive().await;
+                assert_eq!(value, 67);
+            })
+            .unwrap();
+
+        executor.run();
+    }
+
+    #[futures_test::test]
+    async fn test_send_drop() {
+        static PIPE: ConnectedPipe<CriticalSectionRawMutex, usize, 5> = ConnectedPipe::new();
+
+        PIPE.push(23).await;
+        PIPE.push(56).await;
+        PIPE.push(67).await;
+
+        // Create a reader after sending
+        let reader = PIPE.reader();
+        let receive = reader.receive().fuse();
+        pin_mut!(receive);
+
+        let timeout = wait_milis(50).fuse();
+        pin_mut!(timeout);
+
+        let either = select(receive, timeout).await;
+
+        match either {
+            futures_util::future::Either::Left(_) => {
+                panic!("There should be nothing to receive!");
+            }
+            futures_util::future::Either::Right(_) => {}
+        }
+    }
+
+    #[futures_test::test]
+    async fn test_bulk_send_publish() {
+        static PIPE: ConnectedPipe<CriticalSectionRawMutex, usize, 5> = ConnectedPipe::new();
+
+        let executor = ThreadPool::new().unwrap();
+
+        executor
+            .spawn(async {
+                for i in 0..1000 {
+                    PIPE.push(i).await;
+                }
+            })
+            .unwrap();
+
+        executor
+            .spawn(async {
+                for i in 1000..2000 {
+                    PIPE.push(i).await;
+                }
+            })
+            .unwrap();
+
+        let reader = PIPE.reader();
+        for _ in 0..800 {
+            reader.receive().await;
+        }
+    }
+}
diff --git a/Software/MainBoard/rust/src/mcutie_3_0_0/publish.rs b/Software/MainBoard/rust/src/mcutie_3_0_0/publish.rs
new file mode 100644
index 0000000..ef0ea14
--- /dev/null
+++ b/Software/MainBoard/rust/src/mcutie_3_0_0/publish.rs
@@ -0,0 +1,173 @@
+use core::{fmt::Display, future::Future, ops::Deref};
+
+use embedded_io::Write;
+use mqttrs::QoS;
+
+use crate::{io::publish, Error, Payload, Topic, TopicString};
+
+/// A message that can be published to an MQTT broker.
+pub trait Publishable {
+    /// Write this message's topic into the supplied buffer.
+    fn write_topic(&self, buffer: &mut TopicString) -> Result<(), Error>;
+
+    /// Write this message's payload into the supplied buffer.
+    fn write_payload(&self, buffer: &mut Payload) -> Result<(), Error>;
+
+    /// Get this message's QoS level.
+    fn qos(&self) -> QoS {
+        QoS::AtMostOnce
+    }
+
+    /// Whether the broker should retain this message.
+    fn retain(&self) -> bool {
+        false
+    }
+
+    /// Publishes this message to the broker. If the stack has not yet been
+    /// initialized this is likely to panic.
+    fn publish(&self) -> impl Future<Output = Result<(), Error>> {
+        async {
+            let mut topic = TopicString::new();
+            self.write_topic(&mut topic)?;
+
+            let mut payload = Payload::new();
+            self.write_payload(&mut payload)?;
+
+            publish(&topic, &payload, self.qos(), self.retain()).await
+        }
+    }
+}
+
+/// A [`Publishable`] with a raw byte payload.
+pub struct PublishBytes<'a, T, B: AsRef<[u8]>> {
+    pub(crate) topic: &'a Topic<T>,
+    pub(crate) data: B,
+    pub(crate) qos: QoS,
+    pub(crate) retain: bool,
+}
+
+impl<T, B: AsRef<[u8]>> PublishBytes<'_, T, B> {
+    /// Sets the QoS level for this message.
+    pub fn qos(mut self, qos: QoS) -> Self {
+        self.qos = qos;
+        self
+    }
+
+    /// Sets whether the broker should retain this message.
+    pub fn retain(mut self, retain: bool) -> Self {
+        self.retain = retain;
+        self
+    }
+}
+
+impl<'a, T: Deref<Target = str> + 'a, B: AsRef<[u8]>> Publishable for PublishBytes<'a, T, B> {
+    fn write_topic(&self, buffer: &mut TopicString) -> Result<(), Error> {
+        self.topic.to_string(buffer)
+    }
+
+    fn write_payload(&self, buffer: &mut Payload) -> Result<(), Error> {
+        buffer
+            .write_all(self.data.as_ref())
+            .map_err(|_| Error::TooLarge)
+    }
+
+    fn qos(&self) -> QoS {
+        self.qos
+    }
+
+    fn retain(&self) -> bool {
+        self.retain
+    }
+
+    async fn publish(&self) -> Result<(), Error> {
+        let mut topic = TopicString::new();
+        self.write_topic(&mut topic)?;
+
+        publish(&topic, self.data.as_ref(), self.qos(), self.retain()).await
+    }
+}
+
+/// A [`Publishable`] with a payload that implements [`Display`].
+pub struct PublishDisplay<'a, T, D: Display> {
+    pub(crate) topic: &'a Topic<T>,
+    pub(crate) data: D,
+    pub(crate) qos: QoS,
+    pub(crate) retain: bool,
+}
+
+impl<T, D: Display> PublishDisplay<'_, T, D> {
+    /// Sets the QoS level for this message.
+    pub fn qos(mut self, qos: QoS) -> Self {
+        self.qos = qos;
+        self
+    }
+
+    /// Sets whether the broker should retain this message.
+    pub fn retain(mut self, retain: bool) -> Self {
+        self.retain = retain;
+        self
+    }
+}
+
+impl<'a, T: Deref<Target = str> + 'a, D: Display> Publishable for PublishDisplay<'a, T, D> {
+    fn write_topic(&self, buffer: &mut TopicString) -> Result<(), Error> {
+        self.topic.to_string(buffer)
+    }
+
+    fn write_payload(&self, buffer: &mut Payload) -> Result<(), Error> {
+        write!(buffer, "{}", self.data).map_err(|_| Error::TooLarge)
+    }
+
+    fn qos(&self) -> QoS {
+        self.qos
+    }
+
+    fn retain(&self) -> bool {
+        self.retain
+    }
+}
+
+#[cfg(feature = "serde")]
+/// A [`Publishable`] with that serializes a JSON payload.
+pub struct PublishJson<'a, T, D: serde::Serialize> {
+    pub(crate) topic: &'a Topic<T>,
+    pub(crate) data: D,
+    pub(crate) qos: QoS,
+    pub(crate) retain: bool,
+}
+
+#[cfg(feature = "serde")]
+impl<T, D: serde::Serialize> PublishJson<'_, T, D> {
+    /// Sets the QoS level for this message.
+    pub fn qos(mut self, qos: QoS) -> Self {
+        self.qos = qos;
+        self
+    }
+
+    /// Sets whether the broker should retain this message.
+    pub fn retain(mut self, retain: bool) -> Self {
+        self.retain = retain;
+        self
+    }
+}
+
+#[cfg(feature = "serde")]
+impl<'a, T: Deref<Target = str> + 'a, D: serde::Serialize> Publishable for PublishJson<'a, T, D> {
+    fn write_topic(&self, buffer: &mut TopicString) -> Result<(), Error> {
+        self.topic.to_string(buffer)
+    }
+
+    fn write_payload(&self, buffer: &mut Payload) -> Result<(), Error> {
+        buffer
+            .serialize_json(&self.data)
+            .map_err(|_| Error::TooLarge)
+    }
+
+    fn qos(&self) -> QoS {
+        self.qos
+    }
+
+    fn retain(&self) -> bool {
+        self.retain
+    }
+}
diff --git a/Software/MainBoard/rust/src/mcutie_3_0_0/topic.rs b/Software/MainBoard/rust/src/mcutie_3_0_0/topic.rs
new file mode 100644
index 0000000..259fd5b
--- /dev/null
+++ b/Software/MainBoard/rust/src/mcutie_3_0_0/topic.rs
@@ -0,0 +1,284 @@
+use core::{fmt::Display, ops::Deref};
+
+use embassy_futures::select::{select, Either};
+use embassy_sync::pubsub::WaitResult;
+use embassy_time::Timer;
+use heapless::{String, Vec};
+use mqttrs::{Packet, QoS, Subscribe, SubscribeReturnCodes, SubscribeTopic, Unsubscribe};
+
+#[cfg(feature = "serde")]
+use crate::publish::PublishJson;
+use crate::{
+    device_id, device_type,
+    io::{assign_pid, send_packet, subscribe},
+    publish::{PublishBytes, PublishDisplay},
+    ControlMessage, Error, TopicString, CONFIRMATION_TIMEOUT,
+};
+
+/// An MQTT topic that is optionally prefixed with the device type and unique ID.
+/// Normally you will define all your application's topics as consts with static
+/// lifetimes.
+///
+/// A [`Topic`] is the main entry to publishing messages to the broker.
+///
+/// ```
+/// # use mcutie::{Publishable, Topic};
+/// const DEVICE_AVAILABILITY: Topic<&'static str> = Topic::Device("state");
+///
+/// async fn send_status(status: &'static str) {
+///   let _ = DEVICE_AVAILABILITY.with_bytes(status.as_bytes()).publish().await;
+/// }
+/// ```
+#[derive(Clone, Copy)]
+pub enum Topic<T> {
+    /// A topic that is prefixed with the device type.
+    DeviceType(T),
+    /// A topic that is prefixed with the device type and unique ID.
+    Device(T),
+    /// Any topic.
+    General(T),
+}
+
+impl<A, B> PartialEq<Topic<A>> for Topic<B>
+where
+    B: PartialEq<A>,
+{
+    fn eq(&self, other: &Topic<A>) -> bool {
+        match (self, other) {
+            (Topic::DeviceType(l0), Topic::DeviceType(r0)) => l0 == r0,
+            (Topic::Device(l0), Topic::Device(r0)) => l0 == r0,
+            (Topic::General(l0), Topic::General(r0)) => l0 == r0,
+            _ => false,
+        }
+    }
+}
+
+impl<T> Topic<T> {
+    /// Creates a publishable message with something that can return a reference
+    /// to the payload in bytes.
+    ///
+    /// Defaults to non-retained with QoS of 0 (AtMostOnce).
+    pub fn with_bytes<B: AsRef<[u8]>>(&self, data: B) -> PublishBytes<'_, T, B> {
+        PublishBytes {
+            topic: self,
+            data,
+            qos: QoS::AtMostOnce,
+            retain: false,
+        }
+    }
+
+    /// Creates a publishable message with something that implements [`Display`].
+    ///
+    /// Defaults to non-retained with QoS of 0 (AtMostOnce).
+    pub fn with_display<D: Display>(&self, data: D) -> PublishDisplay<'_, T, D> {
+        PublishDisplay {
+            topic: self,
+            data,
+            qos: QoS::AtMostOnce,
+            retain: false,
+        }
+    }
+
+    #[cfg(feature = "serde")]
+    /// Creates a publishable message with something that can be serialized to
+    /// JSON.
+    ///
+    /// Defaults to non-retained with QoS of 0 (AtMostOnce).
+    pub fn with_json<D: serde::Serialize>(&self, data: D) -> PublishJson<'_, T, D> {
+        PublishJson {
+            topic: self,
+            data,
+            qos: QoS::AtMostOnce,
+            retain: false,
+        }
+    }
+}
+
+impl Topic<TopicString> {
+    pub(crate) fn from_str(mut st: &str) -> Result<Self, Error> {
+        let mut strip_prefix = |pr: &str| -> bool {
+            if st.starts_with(pr) && st.len() > pr.len() && &st[pr.len()..pr.len() + 1] == "/" {
+                st = &st[pr.len() + 1..];
+                true
+            } else {
+                false
+            }
+        };
+
+        if strip_prefix(device_type()) {
+            if strip_prefix(device_id()) {
+                let mut topic = TopicString::new();
+                topic.push_str(st).map_err(|_| Error::TooLarge)?;
+                Ok(Topic::Device(topic))
+            } else {
+                let mut topic = TopicString::new();
+                topic.push_str(st).map_err(|_| Error::TooLarge)?;
+                Ok(Topic::DeviceType(topic))
+            }
+        } else {
+            let mut topic = TopicString::new();
+            topic.push_str(st).map_err(|_| Error::TooLarge)?;
+            Ok(Topic::General(topic))
+        }
+    }
+}
+
+impl<T: Deref<Target = str>> Topic<T> {
+    pub(crate) fn to_string<const N: usize>(&self, result: &mut String<N>) -> Result<(), Error> {
+        match self {
+            Topic::Device(st) => {
+                result
+                    .push_str(device_type())
+                    .map_err(|_| Error::TooLarge)?;
+                result.push_str("/").map_err(|_| Error::TooLarge)?;
+                result.push_str(device_id()).map_err(|_| Error::TooLarge)?;
+                result.push_str("/").map_err(|_| Error::TooLarge)?;
+                result.push_str(st.as_ref()).map_err(|_| Error::TooLarge)?;
+            }
+            Topic::DeviceType(st) => {
+                result
+                    .push_str(device_type())
+                    .map_err(|_| Error::TooLarge)?;
+                result.push_str("/").map_err(|_| Error::TooLarge)?;
+                result.push_str(st.as_ref()).map_err(|_| Error::TooLarge)?;
+            }
+            Topic::General(st) => {
+                result.push_str(st.as_ref()).map_err(|_| Error::TooLarge)?;
+            }
+        }
+
+        Ok(())
+    }
+
+    /// Converts to a topic containing an [`str`]. Particularly useful for converting from an owned
+    /// string for match patterns.
+    pub fn as_ref(&self) -> Topic<&str> {
+        match self {
+            Topic::DeviceType(st) => Topic::DeviceType(st.as_ref()),
+            Topic::Device(st) => Topic::Device(st.as_ref()),
+            Topic::General(st) => Topic::General(st.as_ref()),
+        }
+    }
+
+    /// Subscribes to this topic. If `wait_for_ack` is true then this will wait until confirmation
+    /// is received from the broker before returning.
+    pub async fn subscribe(&self, wait_for_ack: bool) -> Result<(), Error> {
+        let mut subscriber = subscribe().await;
+
+        let mut topic_path = TopicString::new();
+        if self.to_string(&mut topic_path).is_err() {
+            return Err(Error::TooLarge);
+        }
+
+        let pid = assign_pid().await;
+
+        let mut subscribe_topic_path = String::<256>::new();
+        subscribe_topic_path
+            .push_str(topic_path.as_str())
+            .map_err(|_| Error::TooLarge)?;
+        let subscribe_topic = SubscribeTopic {
+            topic_path: subscribe_topic_path,
+            qos: QoS::AtLeastOnce,
+        };
+
+        // The size of this vec must match that used by mqttrs.
+        let topics = match Vec::<SubscribeTopic, 5>::from_slice(&[subscribe_topic]) {
+            Ok(t) => t,
+            Err(_) => return Err(Error::TooLarge),
+        };
+
+        let packet = Packet::Subscribe(Subscribe { pid, topics });
+
+        send_packet(packet).await?;
+
+        if wait_for_ack {
+            match select(
+                async {
+                    loop {
+                        match subscriber.next_message().await {
+                            WaitResult::Lagged(_) => {
+                                // Maybe we missed the message?
+                            }
+                            WaitResult::Message(ControlMessage::Subscribed(
+                                subscribed_pid,
+                                return_code,
+                            )) => {
+                                if subscribed_pid == pid {
+                                    if matches!(return_code, SubscribeReturnCodes::Success(_)) {
+                                        return Ok(());
+                                    } else {
+                                        return Err(Error::IOError);
+                                    }
+                                }
+                            }
+                            _ => {}
+                        }
+                    }
+                },
+                Timer::after_millis(CONFIRMATION_TIMEOUT),
+            )
+            .await
+            {
+                Either::First(r) => r,
+                Either::Second(_) => Err(Error::TimedOut),
+            }
+        } else {
+            Ok(())
+        }
+    }
+
+    /// Unsubscribes from a topic. If `wait_for_ack` is true then this will wait until confirmation is
+    /// received from the broker before returning.
+    pub async fn unsubscribe(&self, wait_for_ack: bool) -> Result<(), Error> {
+        let mut subscriber = subscribe().await;
+
+        let mut topic_path = TopicString::new();
+        if self.to_string(&mut topic_path).is_err() {
+            return Err(Error::TooLarge);
+        }
+
+        let pid = assign_pid().await;
+
+        // The size of this vec must match that used by mqttrs.
+        let mut unsubscribe_topic_path = String::<256>::new();
+        unsubscribe_topic_path
+            .push_str(topic_path.as_str())
+            .map_err(|_| Error::TooLarge)?;
+        let topics = match Vec::<String<256>, 5>::from_slice(&[unsubscribe_topic_path]) {
+            Ok(t) => t,
+            Err(_) => return Err(Error::TooLarge),
+        };
+
+        let packet = Packet::Unsubscribe(Unsubscribe { pid, topics });
+
+        send_packet(packet).await?;
+
+        if wait_for_ack {
+            match select(
+                async {
+                    loop {
+                        match subscriber.next_message().await {
+                            WaitResult::Lagged(_) => {
+                                // Maybe we missed the message?
+                            }
+                            WaitResult::Message(ControlMessage::Unsubscribed(subscribed_pid)) => {
+                                if subscribed_pid == pid {
+                                    return Ok(());
+                                }
+                            }
+                            _ => {}
+                        }
+                    }
+                },
+                Timer::after_millis(CONFIRMATION_TIMEOUT),
+            )
+            .await
+            {
+                Either::First(r) => r,
+                Either::Second(_) => Err(Error::TimedOut),
+            }
+        } else {
+            Ok(())
+        }
+    }
+}
diff --git a/Software/MainBoard/rust/src/plant_state.rs b/Software/MainBoard/rust/src/plant_state.rs
index 26f914b..5f00a8a 100644
--- a/Software/MainBoard/rust/src/plant_state.rs
+++ b/Software/MainBoard/rust/src/plant_state.rs
@@ -9,14 +9,16 @@ const MOIST_SENSOR_MIN_FREQUENCY: f32 = 150.; // this is really, really dry, thi
 
 #[derive(Debug, PartialEq, Serialize)]
 pub enum MoistureSensorError {
-    NoMessage,
+    MissingMessage,
+    NotExpectedMessage { hz: f32 },
     ShortCircuit { hz: f32, max: f32 },
     OpenLoop { hz: f32, min: f32 },
 }
 
 #[derive(Debug, PartialEq, Serialize)]
 pub enum MoistureSensorState {
-    MoistureValue { raw_hz: f32, moisture_percent: f32 },
+    MoistureValue { hz: f32, moisture_percent: f32 },
+    NoMessage,
     SensorError(MoistureSensorError),
 }
 
@@ -30,7 +32,7 @@ impl MoistureSensorState {
 
     pub fn moisture_percent(&self) -> Option<f32> {
         if let MoistureSensorState::MoistureValue {
-            raw_hz: _,
+            hz: _,
             moisture_percent,
         } = self
         {
@@ -49,16 +51,27 @@ pub enum PumpError {
         failed_attempts: usize,
         max_allowed_failures: usize,
     },
+    OverCurrent {
+        current_ma: u16,
+        max_allowed_ma: u16,
+    },
 }
 
 #[derive(Debug, Serialize)]
 pub struct PumpState {
     consecutive_pump_count: u32,
     previous_pump: Option<DateTime<Utc>>,
+    pub overcurrent_error: Option<u16>,
 }
 
 impl PumpState {
     fn is_err(&self, plant_config: &PlantConfig) -> Option<PumpError> {
+        if let Some(current_ma) = self.overcurrent_error {
+            return Some(PumpError::OverCurrent {
+                current_ma,
+                max_allowed_ma: plant_config.max_pump_current_ma,
+            });
+        }
         if self.consecutive_pump_count > plant_config.max_consecutive_pump_count as u32 {
             Some(PumpError::PumpNotWorking {
                 failed_attempts: self.consecutive_pump_count as usize,
@@ -82,6 +95,13 @@ pub struct PlantState {
     pub sensor_a: MoistureSensorState,
     pub sensor_b: MoistureSensorState,
     pub pump: PumpState,
+    /// Last known firmware build timestamp for sensor A (minutes since Unix epoch).
+    /// Set during sensor detection; None if detection has not been run yet.
+    pub sensor_a_firmware_build_minutes: Option<u32>,
+    /// Last known firmware build timestamp for sensor B.
+    pub sensor_b_firmware_build_minutes: Option<u32>,
+    /// Last time fertilizer was applied (Unix timestamp in seconds).
+    pub last_fertilizer_time: i64,
 }
 
 fn map_range_moisture(
@@ -111,74 +131,63 @@ fn map_range_moisture(
 }
 
 impl PlantState {
-    pub async fn read_hardware_state(
+    pub async fn interpret_raw_values(
         moistures: Moistures,
         plant_id: usize,
         board: &mut HAL<'_>,
     ) -> Self {
-        let sensor_a = {
-            //if board.board_hal.get_config().plants[plant_id].sensor_a {
-            let raw = moistures.sensor_a_hz[plant_id];
-            match raw {
-                None => MoistureSensorState::SensorError(MoistureSensorError::NoMessage),
-                Some(raw) => {
-                    match map_range_moisture(
-                        raw,
-                        board.board_hal.get_config().plants[plant_id]
-                            .moisture_sensor_min_frequency
-                            .map(|a| a as f32),
-                        board.board_hal.get_config().plants[plant_id]
-                            .moisture_sensor_max_frequency
-                            .map(|b| b as f32),
-                    ) {
-                        Ok(moisture_percent) => MoistureSensorState::MoistureValue {
-                            raw_hz: raw,
-                            moisture_percent,
-                        },
-                        Err(err) => MoistureSensorState::SensorError(err),
-                    }
-                }
-            }
-        }; // else {
-           //    MoistureSensorState::Disabled
-           //};
+        let min = board.board_hal.get_config().plants[plant_id].moisture_sensor_min_frequency;
+        let max = board.board_hal.get_config().plants[plant_id].moisture_sensor_max_frequency;
 
-        let sensor_b = {
-            //if board.board_hal.get_config().plants[plant_id].sensor_b {
-            let raw = moistures.sensor_b_hz[plant_id];
+        let raw_to_value = |raw: Option<f32>, expected: bool| -> MoistureSensorState {
             match raw {
-                None => MoistureSensorState::SensorError(MoistureSensorError::NoMessage),
+                None => {
+                    if expected {
+                        MoistureSensorState::SensorError(MoistureSensorError::MissingMessage)
+                    } else {
+                        MoistureSensorState::NoMessage
+                    }
+                }
                 Some(raw) => {
-                    match map_range_moisture(
-                        raw,
-                        board.board_hal.get_config().plants[plant_id]
-                            .moisture_sensor_min_frequency
-                            .map(|a| a as f32),
-                        board.board_hal.get_config().plants[plant_id]
-                            .moisture_sensor_max_frequency
-                            .map(|b| b as f32),
-                    ) {
-                        Ok(moisture_percent) => MoistureSensorState::MoistureValue {
-                            raw_hz: raw,
-                            moisture_percent,
-                        },
-                        Err(err) => MoistureSensorState::SensorError(err),
+                    if expected {
+                        match map_range_moisture(raw, min.map(|a| a as f32), max.map(|b| b as f32))
+                        {
+                            Ok(moisture_percent) => MoistureSensorState::MoistureValue {
+                                hz: raw,
+                                moisture_percent,
+                            },
+                            Err(err) => MoistureSensorState::SensorError(err),
+                        }
+                    } else {
+                        MoistureSensorState::SensorError(MoistureSensorError::NotExpectedMessage {
+                            hz: raw,
+                        })
                     }
                 }
             }
-        }; // else {
-           //    MoistureSensorState::Disabled
-           //};
+        };
+
+        let expected_a = board.board_hal.get_config().plants[plant_id].sensor_a;
+        let expected_b = board.board_hal.get_config().plants[plant_id].sensor_b;
+
+        let sensor_a = { raw_to_value(moistures.sensor_a_hz[plant_id], expected_a) };
+        let sensor_b = { raw_to_value(moistures.sensor_b_hz[plant_id], expected_b) };
 
         let previous_pump = board.board_hal.get_esp().last_pump_time(plant_id);
         let consecutive_pump_count = board.board_hal.get_esp().consecutive_pump_count(plant_id);
+        let last_fertilizer_time = board.board_hal.get_esp().last_fertilizer_time(plant_id);
+        let (a_builds, b_builds) = board.board_hal.get_sensor_build_minutes();
         let state = Self {
             sensor_a,
             sensor_b,
             pump: PumpState {
                 consecutive_pump_count,
                 previous_pump,
+                overcurrent_error: None,
             },
+            sensor_a_firmware_build_minutes: a_builds[plant_id],
+            sensor_b_firmware_build_minutes: b_builds[plant_id],
+            last_fertilizer_time,
         };
         if state.is_err() {
             let _ = board.board_hal.fault(plant_id, true).await;
@@ -301,6 +310,9 @@ impl PlantState {
             } else {
                 None
             },
+            sensor_a_firmware_build_minutes: self.sensor_a_firmware_build_minutes,
+            sensor_b_firmware_build_minutes: self.sensor_b_firmware_build_minutes,
+            last_fertilizer_time: self.last_fertilizer_time
         }
     }
 }
@@ -329,4 +341,10 @@ pub struct PlantInfo<'a> {
     last_pump: Option<DateTime<Tz>>,
     /// next time when pump should activate
     next_pump: Option<DateTime<Tz>>,
+    /// firmware build timestamp of sensor A (minutes since Unix epoch); None if unknown
+    sensor_a_firmware_build_minutes: Option<u32>,
+    /// firmware build timestamp of sensor B (minutes since Unix epoch); None if unknown
+    sensor_b_firmware_build_minutes: Option<u32>,
+    /// last time when fertilizer was applied
+    last_fertilizer_time: i64,
 }
diff --git a/Software/MainBoard/rust/src/tank.rs b/Software/MainBoard/rust/src/tank.rs
index 5449826..49a30de 100644
--- a/Software/MainBoard/rust/src/tank.rs
+++ b/Software/MainBoard/rust/src/tank.rs
@@ -158,12 +158,11 @@ pub async fn determine_tank_state(
     board: &mut MutexGuard<'static, CriticalSectionRawMutex, HAL<'static>>,
 ) -> TankState {
     if board.board_hal.get_config().tank.tank_sensor_enabled {
-        match board
-            .board_hal
-            .get_tank_sensor()
-            .map(|f| f.tank_sensor_voltage())
-        {
-            Ok(raw_sensor_value_mv) => TankState::Present(raw_sensor_value_mv.await.unwrap()),
+        match board.board_hal.get_tank_sensor() {
+            Ok(sensor) => match sensor.tank_sensor_voltage().await {
+                Ok(raw_sensor_value_mv) => TankState::Present(raw_sensor_value_mv),
+                Err(err) => TankState::Error(TankError::BoardError(err.to_string())),
+            },
             Err(err) => TankState::Error(TankError::BoardError(err.to_string())),
         }
     } else {
diff --git a/Software/MainBoard/rust/src/webserver/backup_manager.rs b/Software/MainBoard/rust/src/webserver/backup_manager.rs
index ef6c4b0..0dde713 100644
--- a/Software/MainBoard/rust/src/webserver/backup_manager.rs
+++ b/Software/MainBoard/rust/src/webserver/backup_manager.rs
@@ -1,8 +1,7 @@
 use crate::fat_error::{FatError, FatResult};
-use crate::hal::rtc::X25;
+use crate::webserver::read_up_to_bytes_from_request;
 use crate::BOARD_ACCESS;
 use alloc::borrow::ToOwned;
-use alloc::format;
 use alloc::string::{String, ToString};
 use chrono::DateTime;
 use edge_http::io::server::Connection;
@@ -21,48 +20,9 @@ pub(crate) async fn get_backup_config<T, const N: usize>(
 where
     T: Read + Write,
 {
-    // First pass: verify checksum without sending data
-    let mut checksum = X25.digest();
-    let mut chunk = 0_usize;
-    loop {
-        let mut board = BOARD_ACCESS.get().await.lock().await;
-        board.board_hal.progress(chunk as u32).await;
-        let (buf, len, expected_crc) = board
-            .board_hal
-            .get_rtc_module()
-            .get_backup_config(chunk)
-            .await?;
+    let mut board = BOARD_ACCESS.get().await.lock().await;
+    let backup = board.board_hal.read_backup().await?;
 
-        // Update checksum with the actual data bytes of this chunk
-        checksum.update(&buf[..len]);
-
-        let is_last = len == 0 || len < buf.len();
-        if is_last {
-            let actual_crc = checksum.finalize();
-            if actual_crc != expected_crc {
-                BOARD_ACCESS
-                    .get()
-                    .await
-                    .lock()
-                    .await
-                    .board_hal
-                    .clear_progress()
-                    .await;
-                conn.initiate_response(
-                    409,
-                    Some(
-                        format!("Checksum mismatch expected {expected_crc} got {actual_crc}")
-                            .as_str(),
-                    ),
-                    &[],
-                )
-                .await?;
-                return Ok(Some(409));
-            }
-            break;
-        }
-        chunk += 1;
-    }
     // Second pass: stream data
     conn.initiate_response(
         200,
@@ -75,35 +35,8 @@ where
     )
     .await?;
 
-    let mut chunk = 0_usize;
-    loop {
-        let mut board = BOARD_ACCESS.get().await.lock().await;
-        board.board_hal.progress(chunk as u32).await;
-        let (buf, len, _expected_crc) = board
-            .board_hal
-            .get_rtc_module()
-            .get_backup_config(chunk)
-            .await?;
-
-        if len == 0 {
-            break;
-        }
-
-        conn.write_all(&buf[..len]).await?;
-
-        if len < buf.len() {
-            break;
-        }
-        chunk += 1;
-    }
-    BOARD_ACCESS
-        .get()
-        .await
-        .lock()
-        .await
-        .board_hal
-        .clear_progress()
-        .await;
+    conn.write_all(serde_json::to_string(&backup)?.as_bytes())
+        .await?;
     Ok(Some(200))
 }
 
@@ -113,49 +46,12 @@ pub(crate) async fn backup_config<T, const N: usize>(
 where
     T: Read + Write,
 {
-    let mut offset = 0_usize;
-    let mut buf = [0_u8; 32];
-
-    let mut checksum = X25.digest();
-
-    let mut counter = 0;
-    loop {
-        let to_write = conn.read(&mut buf).await?;
-        if to_write == 0 {
-            info!("backup finished");
-            break;
-        } else {
-            let mut board = BOARD_ACCESS.get().await.lock().await;
-            board.board_hal.progress(counter).await;
-
-            counter += 1;
-            board
-                .board_hal
-                .get_rtc_module()
-                .backup_config(offset, &buf[0..to_write])
-                .await?;
-            checksum.update(&buf[0..to_write]);
-        }
-        offset += to_write;
-    }
-
+    let input = read_up_to_bytes_from_request(conn, Some(4096)).await?;
+    info!("Read input with length {}", input.len());
     let mut board = BOARD_ACCESS.get().await.lock().await;
-    board
-        .board_hal
-        .get_rtc_module()
-        .backup_config_finalize(checksum.finalize(), offset)
-        .await?;
-    board.board_hal.clear_progress().await;
-    conn.initiate_response(
-        200,
-        Some("OK"),
-        &[
-            ("Access-Control-Allow-Origin", "*"),
-            ("Access-Control-Allow-Headers", "*"),
-            ("Access-Control-Allow-Methods", "*"),
-        ],
-    )
-    .await?;
+    let config_to_backup = serde_json::from_slice(&input)?;
+    info!("Parsed send config to object");
+    board.board_hal.backup_config(&config_to_backup).await?;
     Ok(Some("saved".to_owned()))
 }
 
@@ -166,10 +62,12 @@ where
     T: Read + Write,
 {
     let mut board = BOARD_ACCESS.get().await.lock().await;
-    let header = board.board_hal.get_rtc_module().get_backup_info().await;
-    let json = match header {
+    let info = board.board_hal.backup_info().await;
+
+    let json = match info {
         Ok(h) => {
-            let timestamp = DateTime::from_timestamp_millis(h.timestamp).unwrap();
+            info!("Got backup info: {:?}", h);
+            let timestamp = DateTime::from_timestamp_millis(h.timestamp).unwrap_or_default();
             let wbh = WebBackupHeader {
                 timestamp: timestamp.to_rfc3339(),
                 size: h.size,
@@ -177,6 +75,7 @@ where
             serde_json::to_string(&wbh)?
         }
         Err(err) => {
+            info!("Error getting backup info: {:?}", err);
             let wbh = WebBackupHeader {
                 timestamp: err.to_string(),
                 size: 0,
diff --git a/Software/MainBoard/rust/src/webserver/file_manager.rs b/Software/MainBoard/rust/src/webserver/file_manager.rs
deleted file mode 100644
index 03304ae..0000000
--- a/Software/MainBoard/rust/src/webserver/file_manager.rs
+++ /dev/null
@@ -1,160 +0,0 @@
-use crate::fat_error::{FatError, FatResult};
-use crate::webserver::read_up_to_bytes_from_request;
-use crate::BOARD_ACCESS;
-use alloc::borrow::ToOwned;
-use alloc::format;
-use alloc::string::String;
-use edge_http::io::server::Connection;
-use edge_http::Method;
-use edge_nal::io::{Read, Write};
-use log::info;
-
-pub(crate) async fn list_files<T, const N: usize>(
-    _request: &mut Connection<'_, T, N>,
-) -> FatResult<Option<String>> {
-    let mut board = BOARD_ACCESS.get().await.lock().await;
-    let result = board.board_hal.get_esp().list_files().await?;
-    let file_list_json = serde_json::to_string(&result)?;
-    Ok(Some(file_list_json))
-}
-pub(crate) async fn file_operations<T, const N: usize>(
-    conn: &mut Connection<'_, T, { N }>,
-    method: Method,
-    path: &&str,
-    prefix: &&str,
-) -> Result<Option<u32>, FatError>
-where
-    T: Read + Write,
-{
-    let filename = &path[prefix.len()..];
-    info!("file request for {filename} with method {method}");
-    Ok(match method {
-        Method::Delete => {
-            let mut board = BOARD_ACCESS.get().await.lock().await;
-            board
-                .board_hal
-                .get_esp()
-                .delete_file(filename.to_owned())
-                .await?;
-            conn.initiate_response(
-                200,
-                Some("OK"),
-                &[
-                    ("Access-Control-Allow-Origin", "*"),
-                    ("Access-Control-Allow-Headers", "*"),
-                    ("Access-Control-Allow-Methods", "*"),
-                ],
-            )
-            .await?;
-            Some(200)
-        }
-        Method::Get => {
-            let disposition = format!("attachment; filename=\"{filename}\"");
-            let size = {
-                let mut board = BOARD_ACCESS.get().await.lock().await;
-                board
-                    .board_hal
-                    .get_esp()
-                    .get_size(filename.to_owned())
-                    .await?
-            };
-
-            conn.initiate_response(
-                200,
-                Some("OK"),
-                &[
-                    ("Content-Type", "application/octet-stream"),
-                    ("Content-Disposition", disposition.as_str()),
-                    ("Content-Length", &format!("{size}")),
-                    ("Access-Control-Allow-Origin", "*"),
-                    ("Access-Control-Allow-Headers", "*"),
-                    ("Access-Control-Allow-Methods", "*"),
-                ],
-            )
-            .await?;
-
-            let mut chunk = 0;
-            loop {
-                let mut board = BOARD_ACCESS.get().await.lock().await;
-                board.board_hal.progress(chunk).await;
-                let read_chunk = board
-                    .board_hal
-                    .get_esp()
-                    .get_file(filename.to_owned(), chunk)
-                    .await?;
-                let length = read_chunk.1;
-                if length == 0 {
-                    info!("file request for {filename} finished");
-                    break;
-                }
-                let data = &read_chunk.0[0..length];
-                conn.write_all(data).await?;
-                if length < read_chunk.0.len() {
-                    info!("file request for {filename} finished");
-                    break;
-                }
-                chunk += 1;
-            }
-            BOARD_ACCESS
-                .get()
-                .await
-                .lock()
-                .await
-                .board_hal
-                .clear_progress()
-                .await;
-            Some(200)
-        }
-        Method::Post => {
-            {
-                let mut board = BOARD_ACCESS.get().await.lock().await;
-                //ensure the file is deleted first; otherwise we would need to truncate the file which will not work with streaming
-                let _ = board
-                    .board_hal
-                    .get_esp()
-                    .delete_file(filename.to_owned())
-                    .await;
-            }
-
-            let mut offset = 0_usize;
-            let mut chunk = 0;
-            loop {
-                let buf = read_up_to_bytes_from_request(conn, Some(4096)).await?;
-                if buf.is_empty() {
-                    info!("file request for {filename} finished");
-                    break;
-                } else {
-                    let mut board = BOARD_ACCESS.get().await.lock().await;
-                    board.board_hal.progress(chunk as u32).await;
-                    board
-                        .board_hal
-                        .get_esp()
-                        .write_file(filename.to_owned(), offset as u32, &buf)
-                        .await?;
-                }
-                offset += buf.len();
-                chunk += 1;
-            }
-            BOARD_ACCESS
-                .get()
-                .await
-                .lock()
-                .await
-                .board_hal
-                .clear_progress()
-                .await;
-            conn.initiate_response(
-                200,
-                Some("OK"),
-                &[
-                    ("Access-Control-Allow-Origin", "*"),
-                    ("Access-Control-Allow-Headers", "*"),
-                    ("Access-Control-Allow-Methods", "*"),
-                ],
-            )
-            .await?;
-            Some(200)
-        }
-        _ => None,
-    })
-}
diff --git a/Software/MainBoard/rust/src/webserver/get_json.rs b/Software/MainBoard/rust/src/webserver/get_json.rs
index 107ee90..e565a36 100644
--- a/Software/MainBoard/rust/src/webserver/get_json.rs
+++ b/Software/MainBoard/rust/src/webserver/get_json.rs
@@ -1,11 +1,11 @@
 use crate::fat_error::{FatError, FatResult};
-use crate::hal::{esp_time, PLANT_COUNT};
+use crate::hal::PLANT_COUNT;
 use crate::log::LogMessage;
 use crate::plant_state::{MoistureSensorState, PlantState};
 use crate::tank::determine_tank_state;
 use crate::{get_version, BOARD_ACCESS};
 use alloc::format;
-use alloc::string::String;
+use alloc::string::{String, ToString};
 use alloc::vec::Vec;
 use chrono_tz::Tz;
 use core::str::FromStr;
@@ -40,25 +40,27 @@ where
     let moistures = board.board_hal.measure_moisture_hz().await?;
     let mut plant_state = Vec::new();
     for i in 0..PLANT_COUNT {
-        plant_state.push(PlantState::read_hardware_state(moistures, i, &mut board).await);
+        plant_state.push(PlantState::interpret_raw_values(moistures, i, &mut board).await);
     }
     let a = Vec::from_iter(plant_state.iter().map(|s| match &s.sensor_a {
         MoistureSensorState::MoistureValue {
-            raw_hz,
+            hz: raw_hz,
             moisture_percent,
         } => {
             format!("{moisture_percent:.2}% {raw_hz}hz",)
         }
         MoistureSensorState::SensorError(err) => format!("{err:?}"),
+        MoistureSensorState::NoMessage => "No Message".to_string(),
     }));
     let b = Vec::from_iter(plant_state.iter().map(|s| match &s.sensor_b {
         MoistureSensorState::MoistureValue {
-            raw_hz,
+            hz: raw_hz,
             moisture_percent,
         } => {
             format!("{moisture_percent:.2}% {raw_hz}hz",)
         }
         MoistureSensorState::SensorError(err) => format!("{err:?}"),
+        MoistureSensorState::NoMessage => "No Message".to_string(),
     }));
 
     let data = Moistures {
@@ -107,19 +109,44 @@ pub(crate) async fn get_solar_state<T, const N: usize>(
     Ok(Some(serde_json::to_string(&state)?))
 }
 
-pub(crate) async fn get_version_web<T, const N: usize>(
+pub(crate) async fn get_firmware_info_web<T, const N: usize>(
     _request: &mut Connection<'_, T, N>,
 ) -> FatResult<Option<String>> {
     let mut board = BOARD_ACCESS.get().await.lock().await;
     Ok(Some(serde_json::to_string(&get_version(&mut board).await)?))
 }
 
+/// Return the current in-memory config, or — when `saveidx` is `Some(idx)` —
+/// the JSON stored in save slot `idx`.
 pub(crate) async fn get_config<T, const N: usize>(
     _request: &mut Connection<'_, T, N>,
+    saveidx: Option<usize>,
+) -> FatResult<Option<String>> {
+    let mut board = BOARD_ACCESS.get().await.lock().await;
+    let json = match saveidx {
+        None => serde_json::to_string(board.board_hal.get_config())?,
+        Some(idx) => board.board_hal.get_esp().load_config_slot(idx).await?,
+    };
+    Ok(Some(json))
+}
+
+/// Return a JSON array describing every valid save slot on flash.
+pub(crate) async fn list_saves<T, const N: usize>(
+    _request: &mut Connection<'_, T, N>,
 ) -> FatResult<Option<String>> {
     let mut board = BOARD_ACCESS.get().await.lock().await;
-    let json = serde_json::to_string(&board.board_hal.get_config())?;
-    Ok(Some(json))
+    let saves = board.board_hal.get_esp().list_saves().await?;
+    Ok(Some(serde_json::to_string(&saves)?))
+}
+
+/// Erase (delete) a single save slot by index.
+pub(crate) async fn delete_save<T, const N: usize>(
+    _request: &mut Connection<'_, T, N>,
+    idx: usize,
+) -> FatResult<Option<String>> {
+    let mut board = BOARD_ACCESS.get().await.lock().await;
+    board.board_hal.get_esp().delete_save_slot(idx).await?;
+    Ok(None)
 }
 
 pub(crate) async fn get_battery_state<T, const N: usize>(
@@ -147,7 +174,12 @@ pub(crate) async fn get_time<T, const N: usize>(
         },
     };
 
-    let native = esp_time().await.with_timezone(&tz).to_rfc3339();
+    let native = board
+        .board_hal
+        .get_time()
+        .await
+        .with_timezone(&tz)
+        .to_rfc3339();
 
     let rtc = match board.board_hal.get_rtc_module().get_rtc_time().await {
         Ok(time) => time.with_timezone(&tz).to_rfc3339(),
diff --git a/Software/MainBoard/rust/src/webserver/get_log.rs b/Software/MainBoard/rust/src/webserver/get_log.rs
index 0f403a0..1a4e504 100644
--- a/Software/MainBoard/rust/src/webserver/get_log.rs
+++ b/Software/MainBoard/rust/src/webserver/get_log.rs
@@ -1,7 +1,10 @@
 use crate::fat_error::FatResult;
 use crate::log::LOG_ACCESS;
+use alloc::string::String;
+use alloc::vec::Vec;
 use edge_http::io::server::Connection;
 use edge_nal::io::{Read, Write};
+use serde::Serialize;
 
 pub(crate) async fn get_log<T, const N: usize>(
     conn: &mut Connection<'_, T, N>,
@@ -34,3 +37,29 @@ where
     conn.write_all("]".as_bytes()).await?;
     Ok(Some(200))
 }
+
+#[derive(Serialize)]
+struct LiveLogEntry {
+    seq: u64,
+    text: String,
+}
+
+#[derive(Serialize)]
+struct LiveLogResponse {
+    entries: Vec<LiveLogEntry>,
+    dropped: bool,
+    next_seq: u64,
+}
+
+pub(crate) async fn get_live_log(after: Option<u64>) -> FatResult<Option<String>> {
+    let (raw_entries, dropped, next_seq) = crate::log::INTERCEPTOR.get_live_logs(after);
+    let response = LiveLogResponse {
+        entries: raw_entries
+            .into_iter()
+            .map(|(seq, text)| LiveLogEntry { seq, text })
+            .collect(),
+        dropped,
+        next_seq,
+    };
+    Ok(Some(serde_json::to_string(&response)?))
+}
diff --git a/Software/MainBoard/rust/src/webserver/mod.rs b/Software/MainBoard/rust/src/webserver/mod.rs
index 052b39b..5a6f382 100644
--- a/Software/MainBoard/rust/src/webserver/mod.rs
+++ b/Software/MainBoard/rust/src/webserver/mod.rs
@@ -1,7 +1,6 @@
 //offer ota and config mode
 
 mod backup_manager;
-mod file_manager;
 mod get_json;
 mod get_log;
 mod get_static;
@@ -10,17 +9,16 @@ mod post_json;
 
 use crate::fat_error::{FatError, FatResult};
 use crate::webserver::backup_manager::{backup_config, backup_info, get_backup_config};
-use crate::webserver::file_manager::{file_operations, list_files};
 use crate::webserver::get_json::{
-    get_battery_state, get_config, get_live_moisture, get_log_localization_config, get_solar_state,
-    get_time, get_timezones, get_version_web, tank_info,
+    delete_save, get_battery_state, get_config, get_live_moisture, get_log_localization_config,
+    get_firmware_info_web, get_solar_state, get_time, get_timezones, list_saves, tank_info,
 };
-use crate::webserver::get_log::get_log;
+use crate::webserver::get_log::{get_live_log, get_log};
 use crate::webserver::get_static::{serve_bundle, serve_favicon, serve_index};
 use crate::webserver::ota::ota_operations;
 use crate::webserver::post_json::{
-    board_test, can_power, detect_sensors, night_lamp_test, pump_test, set_config, wifi_scan,
-    write_time,
+    board_test, can_power, detect_sensors, fertilizer_pump_test, night_lamp_test, pump_test,
+    set_config, wifi_scan, write_time,
 };
 use crate::{bail, BOARD_ACCESS};
 use alloc::borrow::ToOwned;
@@ -60,10 +58,7 @@ impl Handler for HTTPRequestRouter {
         let method = headers.method;
         let path = headers.path;
 
-        let prefix = "/file?filename=";
-        let status = if path.starts_with(prefix) {
-            file_operations(conn, method, &path, &prefix).await?
-        } else if path == "/ota" {
+        let status = if path == "/ota" {
             ota_operations(conn, method).await.map_err(|e| {
                 error!("Error handling ota: {e}");
                 e
@@ -78,17 +73,32 @@ impl Handler for HTTPRequestRouter {
                     "/get_backup_config" => get_backup_config(conn).await?,
                     &_ => {
                         let json = match path {
-                            "/version" => Some(get_version_web(conn).await),
+                            "/firmware_info" => Some(get_firmware_info_web(conn).await),
                             "/time" => Some(get_time(conn).await),
                             "/battery" => Some(get_battery_state(conn).await),
                             "/solar" => Some(get_solar_state(conn).await),
-                            "/get_config" => Some(get_config(conn).await),
-                            "/files" => Some(list_files(conn).await),
                             "/log_localization" => Some(get_log_localization_config(conn).await),
                             "/tank" => Some(tank_info(conn).await),
                             "/backup_info" => Some(backup_info(conn).await),
                             "/timezones" => Some(get_timezones().await),
                             "/moisture" => Some(get_live_moisture(conn).await),
+                            "/list_saves" => Some(list_saves(conn).await),
+                            // /live_log accepts an optional ?after=N query parameter
+                            p if p == "/live_log" || p.starts_with("/live_log?") => {
+                                let after: Option<u64> = p
+                                    .find("after=")
+                                    .and_then(|pos| p[pos + 6..].split('&').next())
+                                    .and_then(|s| s.parse().ok());
+                                Some(get_live_log(after).await)
+                            }
+                            // /get_config accepts an optional ?saveidx=N query parameter
+                            p if p == "/get_config" || p.starts_with("/get_config?") => {
+                                let saveidx: Option<usize> = p
+                                    .find("saveidx=")
+                                    .and_then(|pos| p[pos + 8..].split('&').next())
+                                    .and_then(|s| s.parse().ok());
+                                Some(get_config(conn, saveidx).await)
+                            }
                             _ => None,
                         };
                         match json {
@@ -106,6 +116,7 @@ impl Handler for HTTPRequestRouter {
                         "/pumptest" => Some(pump_test(conn).await),
                         "/can_power" => Some(can_power(conn).await),
                         "/lamptest" => Some(night_lamp_test(conn).await),
+                        "/fertilizerpumptest" => Some(fertilizer_pump_test(conn).await),
                         "/boardtest" => Some(board_test().await),
                         "/detect_sensors" => Some(detect_sensors(conn).await),
                         "/reboot" => {
@@ -127,7 +138,28 @@ impl Handler for HTTPRequestRouter {
                         Some(json) => Some(handle_json(conn, json).await?),
                     }
                 }
-                Method::Options | Method::Delete | Method::Head | Method::Put => None,
+                Method::Delete => {
+                    // DELETE /delete_save?idx=N
+                    let json = if path == "/delete_save" || path.starts_with("/delete_save?") {
+                        let idx: Option<usize> = path
+                            .find("idx=")
+                            .and_then(|pos| path[pos + 4..].split('&').next())
+                            .and_then(|s| s.parse().ok());
+                        match idx {
+                            Some(idx) => Some(delete_save(conn, idx).await),
+                            None => Some(Err(FatError::String {
+                                error: "missing idx parameter".into(),
+                            })),
+                        }
+                    } else {
+                        None
+                    };
+                    match json {
+                        None => None,
+                        Some(json) => Some(handle_json(conn, json).await?),
+                    }
+                }
+                Method::Options | Method::Head | Method::Put => None,
                 _ => None,
             }
         };
@@ -181,6 +213,7 @@ where
 }
 
 #[embassy_executor::task]
+#[allow(clippy::panic, clippy::unwrap_used, clippy::expect_used)]
 pub async fn http_server(reboot_now: Arc<AtomicBool>, stack: Stack<'static>) {
     let buffer: TcpBuffers<2, 1024, 1024> = TcpBuffers::new();
     let tcp = Tcp::new(stack, &buffer);
@@ -241,6 +274,7 @@ where
         Err(err) => {
             let error_text = err.to_string();
             info!("error handling process {error_text}");
+
             conn.initiate_response(
                 500,
                 Some("OK"),
diff --git a/Software/MainBoard/rust/src/webserver/post_json.rs b/Software/MainBoard/rust/src/webserver/post_json.rs
index c92fa75..8b6201c 100644
--- a/Software/MainBoard/rust/src/webserver/post_json.rs
+++ b/Software/MainBoard/rust/src/webserver/post_json.rs
@@ -1,13 +1,15 @@
 use crate::config::PlantControllerConfig;
 use crate::fat_error::FatResult;
-use crate::hal::{esp_set_time, Detection};
+use crate::hal::DetectionRequest;
 use crate::webserver::read_up_to_bytes_from_request;
 use crate::{do_secure_pump, BOARD_ACCESS};
+use alloc::borrow::ToOwned;
 use alloc::string::{String, ToString};
 use alloc::vec::Vec;
 use chrono::DateTime;
 use edge_http::io::server::Connection;
 use edge_nal::io::{Read, Write};
+use esp_radio::wifi::ap::AccessPointInfo;
 use log::info;
 use serde::{Deserialize, Serialize};
 
@@ -40,10 +42,10 @@ pub(crate) async fn wifi_scan<T, const N: usize>(
     let mut board = BOARD_ACCESS.get().await.lock().await;
     info!("start wifi scan");
     let mut ssids: Vec<String> = Vec::new();
-    let scan_result = board.board_hal.get_esp().wifi_scan().await?;
+    let scan_result: Vec<AccessPointInfo> = board.board_hal.get_esp().wifi_scan().await?;
     scan_result
         .iter()
-        .for_each(|s| ssids.push(s.ssid.to_string()));
+        .for_each(|s| ssids.push(s.ssid.as_str().to_owned()));
     let ssid_json = serde_json::to_string(&SSIDList { ssids })?;
     info!("Sending ssid list {}", &ssid_json);
     Ok(Some(ssid_json))
@@ -62,7 +64,7 @@ where
     T: Read + Write,
 {
     let actual_data = read_up_to_bytes_from_request(request, None).await?;
-    let detect: Detection = serde_json::from_slice(&actual_data)?;
+    let detect: DetectionRequest = serde_json::from_slice(&actual_data)?;
     let mut board = BOARD_ACCESS.get().await.lock().await;
     let result = board.board_hal.detect_sensors(detect).await?;
     let json = serde_json::to_string(&result)?;
@@ -100,6 +102,19 @@ where
     Ok(None)
 }
 
+pub(crate) async fn fertilizer_pump_test<T, const N: usize>(
+    _request: &mut Connection<'_, T, N>,
+) -> FatResult<Option<String>>
+where
+    T: Read + Write,
+{
+    let mut board = BOARD_ACCESS.get().await.lock().await;
+    board.board_hal.fertilizer_pump(true).await?;
+    embassy_time::Timer::after_millis(1000).await;
+    board.board_hal.fertilizer_pump(false).await?;
+    Ok(None)
+}
+
 pub(crate) async fn write_time<T, const N: usize>(
     request: &mut Connection<'_, T, N>,
 ) -> FatResult<Option<String>>
@@ -108,8 +123,9 @@ where
 {
     let actual_data = read_up_to_bytes_from_request(request, None).await?;
     let time: SetTime = serde_json::from_slice(&actual_data)?;
-    let parsed = DateTime::parse_from_rfc3339(time.time).unwrap();
-    esp_set_time(parsed).await?;
+    let parsed = DateTime::parse_from_rfc3339(time.time)?;
+    let mut board = BOARD_ACCESS.get().await.lock().await;
+    board.board_hal.set_time(&parsed).await?;
     Ok(None)
 }
 
diff --git a/Software/MainBoard/rust/src_webpack/src/api.ts b/Software/MainBoard/rust/src_webpack/src/api.ts
index 876390b..ec0e4fa 100644
--- a/Software/MainBoard/rust/src_webpack/src/api.ts
+++ b/Software/MainBoard/rust/src_webpack/src/api.ts
@@ -1,6 +1,17 @@
 export interface LogArray extends Array<LogEntry> {
 }
 
+export interface LiveLogEntry {
+    seq: number,
+    text: string,
+}
+
+export interface LiveLogResponse {
+    entries: LiveLogEntry[],
+    dropped: boolean,
+    next_seq: number,
+}
+
 export interface LogEntry {
     timestamp: string,
     message_id: number,
@@ -34,6 +45,12 @@ export interface NetworkConfig {
     max_wait: number
 }
 
+export interface SaveInfo {
+    idx: number,
+    len: number,
+    created_at: string | null,
+}
+
 export interface FileList {
     total: number,
     used: number,
@@ -92,6 +109,7 @@ export enum BoardVersion {
 export interface BoardHardware {
     board: BoardVersion,
     battery: BatteryBoardVersion,
+    pump_corrosion_protection: boolean,
 }
 
 export interface PlantControllerConfig {
@@ -110,6 +128,8 @@ export interface PlantConfig {
     min_moisture: number,
     pump_time_s: number,
     pump_cooldown_min: number,
+    fertilizer_s: number,
+    fertilizer_cooldown_min: number,
     pump_hour_start: number,
     pump_hour_end: number,
     pump_limit_ml: number,
@@ -165,6 +185,10 @@ export interface VersionInfo {
     current: string,
     slot0_state: string,
     slot1_state: string,
+    heap_total: number,
+    heap_used: number,
+    heap_free: number,
+    heap_max_used: number,
 }
 
 export interface BatteryState {
@@ -177,9 +201,22 @@ export interface BatteryState {
     state_of_health: string
 }
 
-export interface DetectionPlant {
+/// Request: which sensors to send IDENTIFY_CMD to.
+export interface SensorRequest {
     sensor_a: boolean,
-    sensor_b: boolean
+    sensor_b: boolean,
+}
+
+export interface DetectionRequest {
+    plant: SensorRequest[]
+}
+
+/// Response: detection result per plant.
+/// sensor_a / sensor_b: firmware build timestamp in minutes since Unix epoch,
+/// or null if the sensor did not respond.
+export interface DetectionPlant {
+    sensor_a: number | null,
+    sensor_b: number | null,
 }
 
 export interface Detection {
diff --git a/Software/MainBoard/rust/src_webpack/src/fileview.html b/Software/MainBoard/rust/src_webpack/src/fileview.html
index 3c7f49a..eae1b2f 100644
--- a/Software/MainBoard/rust/src_webpack/src/fileview.html
+++ b/Software/MainBoard/rust/src_webpack/src/fileview.html
@@ -29,44 +29,10 @@
   }
 </style>
 
-<div class="subtitle">Files:</div>
-<div class="flexcontainer">
-  <div class="filekey">Total Size</div>
-  <div id="filetotalsize" class="filevalue"></div>
-</div>
-<div class="flexcontainer">
-  <div class="filekey">Used Size</div>
-  <div id="fileusedsize" class="filevalue"></div>
-</div>
-<div class="flexcontainer">
-  <div class="filekey">Free Size</div>
-  <div id="filefreesize" class="filevalue"></div>
-</div>
-<br>
-
-<div class="flexcontainer"  style="border-left-style: double; border-right-style: double; border-top-style: double;">
-  <div class="subtitle" >Upload:</div>
-</div>
-<div class="flexcontainer" style="border-left-style: double; border-right-style: double;">
-  <div class="flexcontainer">
-    <div class="filekey">
-      File:
-    </div>
-    <input id="fileuploadfile" class="filevalue" type="file">
-  </div>
-  <div class="flexcontainer">
-    <div class="filekey">
-      Name:
-    </div>
-    <input id="fileuploadname" class="filevalue" type="text">
-  </div>
-</div>
-<div class="flexcontainer" style="border-left-style: double; border-right-style: double; border-bottom-style: double;">
-  <button id="fileuploadbtn" class="subtitle">Upload</button>
-</div>
+<div class="subtitle">Save Slots:</div>
 <br>
 <div class="flexcontainer" style="border-left-style: double; border-right-style: double; border-top-style: double;">
   <div class="subtitle">List:</div>
 </div>
 <div id="fileList" class="flexcontainer" style="border-left-style: double; border-right-style: double; border-bottom-style: double;">
-</div>
\ No newline at end of file
+</div>
diff --git a/Software/MainBoard/rust/src_webpack/src/fileview.ts b/Software/MainBoard/rust/src_webpack/src/fileview.ts
index 4a30f72..5f44cb0 100644
--- a/Software/MainBoard/rust/src_webpack/src/fileview.ts
+++ b/Software/MainBoard/rust/src_webpack/src/fileview.ts
@@ -1,96 +1,62 @@
 import {Controller} from "./main";
-import {FileInfo, FileList} from "./api";
-const regex = /[^a-zA-Z0-9_.]/g;
-
-function sanitize(str:string){
-  return str.replaceAll(regex, '_')
-} 
+import {SaveInfo} from "./api";
 
 export class FileView {
   readonly fileListView: HTMLElement;
   readonly controller: Controller;
-  readonly filefreesize: HTMLElement;
-  readonly filetotalsize: HTMLElement;
-  readonly fileusedsize: HTMLElement;
 
   constructor(controller: Controller) {
     (document.getElementById("fileview") as HTMLElement).innerHTML = require('./fileview.html') as string;
-    this.fileListView = document.getElementById("fileList") as HTMLElement
-    this.filefreesize = document.getElementById("filefreesize") as HTMLElement
-    this.filetotalsize = document.getElementById("filetotalsize") as HTMLElement
-    this.fileusedsize = document.getElementById("fileusedsize") as HTMLElement
-
-    let fileuploadfile = document.getElementById("fileuploadfile") as HTMLInputElement
-    let fileuploadname = document.getElementById("fileuploadname") as HTMLInputElement
-    let fileuploadbtn = document.getElementById("fileuploadbtn") as HTMLInputElement
-    fileuploadfile.onchange = () => {
-      const selectedFile = fileuploadfile.files?.[0];
-      if (selectedFile == null) {
-        //TODO error dialog here
-        return
-      }
-      
-      fileuploadname.value = sanitize(selectedFile.name)
-    };
-
-    fileuploadname.onchange = () => {
-      let input = fileuploadname.value
-      let clean = sanitize(fileuploadname.value)
-      if (input != clean){
-        fileuploadname.value = clean
-      }
-    }
-
-    fileuploadbtn.onclick = () => {
-      const selectedFile = fileuploadfile.files?.[0];
-      if (selectedFile == null) {
-        //TODO error dialog here
-        return
-      }
-      controller.uploadFile(selectedFile, selectedFile.name)
-    }
-
-
-
+    this.fileListView = document.getElementById("fileList") as HTMLElement;
     this.controller = controller;
   }
 
-  setFileList(fileList: FileList, public_url: string) {
-    this.filetotalsize.innerText = Math.floor(fileList.total / 1024) + "kB"
-    this.fileusedsize.innerText = Math.ceil(fileList.used / 1024) + "kB"
-    this.filefreesize.innerText = Math.ceil((fileList.total - fileList.used) / 1024) + "kB"
+  setSaveList(saves: SaveInfo[], public_url: string) {
+    // Sort newest first (highest index = most recently written slot)
+    const sorted = saves.slice().sort((a, b) => b.idx - a.idx);
 
-    //fast clear
-    this.fileListView.textContent = ""
-    for (let i = 0; i < fileList.files.length; i++) {
-      let file = fileList.files[i]
-      new FileEntry(this.controller, i, file, this.fileListView, public_url);
+    this.fileListView.textContent = "";
+    for (let i = 0; i < sorted.length; i++) {
+      new SaveEntry(this.controller, i, sorted[i], this.fileListView, public_url);
     }
   }
 }
 
-class FileEntry {
+class SaveEntry {
   view: HTMLElement;
-  constructor(controller: Controller, fileid: number, fileinfo: FileInfo, parent: HTMLElement, public_url: string) {
-    this.view = document.createElement("div") as HTMLElement
-    parent.appendChild(this.view)
-    this.view.classList.add("fileentryouter")
+  constructor(controller: Controller, fileid: number, saveinfo: SaveInfo, parent: HTMLElement, public_url: string) {
+    this.view = document.createElement("div") as HTMLElement;
+    parent.appendChild(this.view);
+    this.view.classList.add("fileentryouter");
 
     const template = require('./fileviewentry.html') as string;
-    this.view.innerHTML = template.replaceAll("${fileid}", String(fileid))
+    this.view.innerHTML = template.replaceAll("${fileid}", String(fileid));
 
     let name = document.getElementById("file_" + fileid + "_name") as HTMLElement;
+    let created = document.getElementById("file_" + fileid + "_created") as HTMLElement;
     let size = document.getElementById("file_" + fileid + "_size") as HTMLElement;
     let deleteBtn = document.getElementById("file_" + fileid + "_delete") as HTMLButtonElement;
     deleteBtn.onclick = () => {
-      controller.deleteFile(fileinfo.filename);
-    }
+      controller.deleteSlot(saveinfo.idx);
+    };
 
     let downloadBtn = document.getElementById("file_" + fileid + "_download") as HTMLAnchorElement;
-    downloadBtn.href = public_url + "/file?filename=" + fileinfo.filename
-    downloadBtn.download = fileinfo.filename
+    downloadBtn.href = public_url + "/get_config?saveidx=" + saveinfo.idx;
+    downloadBtn.download = "config_slot_" + saveinfo.idx + ".json";
 
-    name.innerText = fileinfo.filename;
-    size.innerText = fileinfo.size.toString()
+    name.innerText = "Slot " + saveinfo.idx;
+    size.innerText = saveinfo.len + " bytes";
+
+    // Format timestamp in browser's local timezone
+    if (saveinfo.created_at) {
+      try {
+        const date = new Date(saveinfo.created_at);
+        created.innerText = date.toLocaleString();
+      } catch (e) {
+        created.innerText = "Invalid date";
+      }
+    } else {
+      created.innerText = "Unknown";
+    }
   }
-}
\ No newline at end of file
+}
diff --git a/Software/MainBoard/rust/src_webpack/src/fileviewentry.html b/Software/MainBoard/rust/src_webpack/src/fileviewentry.html
index b602480..898141b 100644
--- a/Software/MainBoard/rust/src_webpack/src/fileviewentry.html
+++ b/Software/MainBoard/rust/src_webpack/src/fileviewentry.html
@@ -1,11 +1,17 @@
 <div class="flexcontainer">
-    <div id="file_${fileid}_name" class="filetitle">Name</div>
+    <div id="file_${fileid}_name" class="filetitle">Slot</div>
+</div>
+
+<div class="flexcontainer">
+    <div class="filekey">Created</div>
+    <div id="file_${fileid}_created" class="filevalue"></div>
 </div>
 
 <div class="flexcontainer">
     <div class="filekey">Size</div>
-    <div id = "file_${fileid}_size" class="filevalue"></div>
-    <a id = "file_${fileid}_download" class="filevalue" target="_blank">Download</a>
-    <button id = "file_${fileid}_delete" class="filevalue">Delete</button>
+    <div id="file_${fileid}_size" class="filevalue"></div>
+    <a id="file_${fileid}_download" class="filevalue" target="_blank">Download</a>
+    <button id="file_${fileid}_delete" class="filevalue">Delete</button>
 </div>
 
+
diff --git a/Software/MainBoard/rust/src_webpack/src/hardware.html b/Software/MainBoard/rust/src_webpack/src/hardware.html
index 0b2a24b..1722cdd 100644
--- a/Software/MainBoard/rust/src_webpack/src/hardware.html
+++ b/Software/MainBoard/rust/src_webpack/src/hardware.html
@@ -18,3 +18,12 @@
     <select class="boardvalue" id="hardware_battery_value">
     </select>
 </div>
+<div class="flexcontainer">
+  <div class="boardkey">Pump corrosion protection (weekly)</div>
+  <input type="checkbox" id="hardware_pump_corrosion_protection">
+</div>
+
+<div class="subtitle">Fertilizer Pump:</div>
+<div class="flexcontainer">
+  <button class="subtitle" id="fertilizer_pump_test">Test Fertilizer Pump</button>
+</div>
diff --git a/Software/MainBoard/rust/src_webpack/src/hardware.ts b/Software/MainBoard/rust/src_webpack/src/hardware.ts
index 86758f2..64462a9 100644
--- a/Software/MainBoard/rust/src_webpack/src/hardware.ts
+++ b/Software/MainBoard/rust/src_webpack/src/hardware.ts
@@ -4,6 +4,8 @@ import {BatteryBoardVersion, BoardHardware, BoardVersion} from "./api";
 export class HardwareConfigView {
     private readonly hardware_board_value: HTMLSelectElement;
     private readonly hardware_battery_value: HTMLSelectElement;
+    private readonly hardware_pump_corrosion_protection: HTMLInputElement;
+    private readonly fertilizer_pump_test: HTMLButtonElement;
     constructor(controller:Controller){
       (document.getElementById("hardwareview") as HTMLElement).innerHTML = require('./hardware.html') as string;
 
@@ -29,17 +31,27 @@ export class HardwareConfigView {
         option.innerText = version.toString();
         this.hardware_battery_value.appendChild(option);
       })
+
+      this.hardware_pump_corrosion_protection = document.getElementById("hardware_pump_corrosion_protection") as HTMLInputElement;
+      this.hardware_pump_corrosion_protection.onchange = controller.configChanged
+
+      this.fertilizer_pump_test = document.getElementById("fertilizer_pump_test") as HTMLButtonElement;
+      this.fertilizer_pump_test.onclick = () => {
+        controller.testFertilizerPump();
+      }
     }
   
     setConfig(hardware: BoardHardware) {
       this.hardware_board_value.value = hardware.board.toString()
       this.hardware_battery_value.value = hardware.battery.toString()
+      this.hardware_pump_corrosion_protection.checked = hardware.pump_corrosion_protection
     }
   
     getConfig(): BoardHardware {
       return {
         board :  BoardVersion[this.hardware_board_value.value as keyof typeof BoardVersion],
         battery :  BatteryBoardVersion[this.hardware_battery_value.value as keyof typeof BatteryBoardVersion],
+        pump_corrosion_protection : this.hardware_pump_corrosion_protection.checked,
       }
     }
   }
diff --git a/Software/MainBoard/rust/src_webpack/src/log.html b/Software/MainBoard/rust/src_webpack/src/log.html
index 05c6be7..3863bf4 100644
--- a/Software/MainBoard/rust/src_webpack/src/log.html
+++ b/Software/MainBoard/rust/src_webpack/src/log.html
@@ -1,7 +1,48 @@
 <style>
+    #livelogpanel {
+        font-family: monospace;
+        font-size: 0.85em;
+        background: #1a1a1a;
+        color: #d4d4d4;
+        padding: 8px;
+        max-height: 300px;
+        overflow-y: auto;
+        border: 1px solid #444;
+        white-space: pre-wrap;
+        word-break: break-all;
+    }
 
+    .livelog-dropped {
+        color: #f0a500;
+        font-style: italic;
+    }
+
+    .log-accordion-header {
+        cursor: pointer;
+        user-select: none;
+        display: flex;
+        align-items: center;
+        gap: 6px;
+    }
+
+    .log-accordion-header::before {
+        content: "▶";
+        font-size: 0.75em;
+        transition: transform 0.15s;
+        display: inline-block;
+    }
+
+    .log-accordion-header.open::before {
+        transform: rotate(90deg);
+    }
+
+    #logpanel {
+        display: none;
+    }
 </style>
-<button id="loadLog">Load Logs</button>
-<div id="logpanel">
-    
-</div>
\ No newline at end of file
+
+<h4 id="logAccordionHeader" class="log-accordion-header">Application Log</h4>
+<div id="logpanel"></div>
+
+<h4>Live Log</h4>
+<div id="livelogpanel"></div>
diff --git a/Software/MainBoard/rust/src_webpack/src/log.ts b/Software/MainBoard/rust/src_webpack/src/log.ts
index 1e38724..0b8b914 100644
--- a/Software/MainBoard/rust/src_webpack/src/log.ts
+++ b/Software/MainBoard/rust/src_webpack/src/log.ts
@@ -1,19 +1,38 @@
 import { Controller } from "./main";
-import {LogArray, LogLocalisation} from "./api";
+import {LiveLogResponse, LogArray, LogLocalisation} from "./api";
+
+const LIVE_LOG_POLL_INTERVAL_MS = 2000;
 
 export class LogView {
   private readonly logpanel: HTMLElement;
-  private readonly loadLog: HTMLButtonElement;
+  private readonly livelogpanel: HTMLElement;
+  private readonly accordionHeader: HTMLElement;
   loglocale: LogLocalisation | undefined;
 
+  private liveLogNextSeq: number | undefined = undefined;
+  private liveLogTimer: ReturnType<typeof setTimeout> | undefined = undefined;
+  private structuredLogLoaded = false;
+
   constructor(controller: Controller) {
     (document.getElementById("logview") as HTMLElement).innerHTML = require('./log.html') as string;
-    this.logpanel = document.getElementById("logpanel") as HTMLElement
-    this.loadLog = document.getElementById("loadLog") as HTMLButtonElement
+    this.logpanel = document.getElementById("logpanel") as HTMLElement;
+    this.livelogpanel = document.getElementById("livelogpanel") as HTMLElement;
+    this.accordionHeader = document.getElementById("logAccordionHeader") as HTMLElement;
 
-    this.loadLog.onclick = () => {
-      controller.loadLog();
-    }
+    this.accordionHeader.onclick = () => {
+      const isOpen = this.logpanel.style.display !== "none";
+      if (isOpen) {
+        this.logpanel.style.display = "none";
+        this.accordionHeader.classList.remove("open");
+      } else {
+        this.logpanel.style.display = "";
+        this.accordionHeader.classList.add("open");
+        if (!this.structuredLogLoaded) {
+          this.structuredLogLoaded = true;
+          controller.loadLog();
+        }
+      }
+    };
   }
 
   setLogLocalisation(loglocale: LogLocalisation) {
@@ -21,10 +40,10 @@ export class LogView {
   }
 
   setLog(logs: LogArray) {
-    this.logpanel.textContent = ""
+    this.logpanel.textContent = "";
     logs.forEach(entry => {
       let message = this.loglocale!![entry.message_id];
-      let template = message.message
+      let template = message.message;
       template = template.replace("${number_a}", entry.a.toString());
       template = template.replace("${number_b}", entry.b.toString());
       template = template.replace("${txt_short}", entry.txt_short.toString());
@@ -32,15 +51,67 @@ export class LogView {
 
       let ts = new Date(entry.timestamp);
 
-      let div = document.createElement("div")
-      let timestampDiv = document.createElement("div")
-      let messageDiv = document.createElement("div")
+      let div = document.createElement("div");
+      let timestampDiv = document.createElement("div");
+      let messageDiv = document.createElement("div");
       timestampDiv.innerText = ts.toISOString();
       messageDiv.innerText = template;
-      div.appendChild(timestampDiv)
-      div.appendChild(messageDiv)
-      this.logpanel.appendChild(div)
-    }
-    )
+      div.appendChild(timestampDiv);
+      div.appendChild(messageDiv);
+      this.logpanel.appendChild(div);
+    });
   }
-}
\ No newline at end of file
+
+  startLivePoll(publicUrl: string) {
+    if (this.liveLogTimer !== undefined) {
+      return;
+    }
+    const poll = async () => {
+      try {
+        const url = this.liveLogNextSeq !== undefined
+          ? `${publicUrl}/live_log?after=${this.liveLogNextSeq}`
+          : `${publicUrl}/live_log`;
+        const response = await fetch(url);
+        const data = await response.json() as LiveLogResponse;
+        this.appendLiveLog(data);
+      } catch (_e) {
+        // network error — silently ignore, will retry next interval
+      }
+      this.liveLogTimer = setTimeout(poll, LIVE_LOG_POLL_INTERVAL_MS);
+    };
+    // Kick off immediately
+    this.liveLogTimer = setTimeout(poll, 0);
+  }
+
+  stopLivePoll() {
+    if (this.liveLogTimer !== undefined) {
+      clearTimeout(this.liveLogTimer);
+      this.liveLogTimer = undefined;
+    }
+  }
+
+  private appendLiveLog(data: LiveLogResponse) {
+    const panel = this.livelogpanel;
+    const wasAtBottom = panel.scrollHeight - panel.scrollTop <= panel.clientHeight + 4;
+
+    if (data.dropped) {
+      const marker = document.createElement("div");
+      marker.className = "livelog-dropped";
+      marker.textContent = "[..]";
+      panel.appendChild(marker);
+    }
+
+    for (const entry of data.entries) {
+      const line = document.createElement("div");
+      line.textContent = entry.text;
+      panel.appendChild(line);
+    }
+
+    this.liveLogNextSeq = data.next_seq;
+
+    // Auto-scroll to bottom only if user was already at the bottom
+    if (wasAtBottom) {
+      panel.scrollTop = panel.scrollHeight;
+    }
+  }
+}
diff --git a/Software/MainBoard/rust/src_webpack/src/main.ts b/Software/MainBoard/rust/src_webpack/src/main.ts
index 5469923..996ca2d 100644
--- a/Software/MainBoard/rust/src_webpack/src/main.ts
+++ b/Software/MainBoard/rust/src_webpack/src/main.ts
@@ -29,7 +29,7 @@ import {
     SetTime, SSIDList, TankInfo,
     TestPump,
     VersionInfo,
-    FileList, SolarState, PumpTestResult, Detection, CanPower
+    SaveInfo, SolarState, PumpTestResult, Detection, DetectionRequest, CanPower
 } from "./api";
 import {SolarView} from "./solarview";
 import {toast} from "./toast";
@@ -47,28 +47,26 @@ export class Controller {
             });
     }
 
-    loadLogLocaleConfig() {
-        return fetch(PUBLIC_URL + "/log_localization")
-            .then(response => response.json())
-            .then(json => json as LogLocalisation)
-            .then(loglocale => {
-                controller.logView.setLogLocalisation(loglocale)
-            })
-            .catch(error => {
-                console.log(error);
-            });
+    async loadLogLocaleConfig() {
+        try {
+            const response = await fetch(PUBLIC_URL + "/log_localization");
+            const json = await response.json();
+            const loglocale = json as LogLocalisation;
+            controller.logView.setLogLocalisation(loglocale);
+        } catch (error) {
+            console.log(error);
+        }
     }
 
-    loadLog() {
-        return fetch(PUBLIC_URL + "/log")
-            .then(response => response.json())
-            .then(json => json as LogArray)
-            .then(logs => {
-                controller.logView.setLog(logs)
-            })
-            .catch(error => {
-                console.log(error);
-            });
+    async loadLog() {
+        try {
+            const response = await fetch(PUBLIC_URL + "/log");
+            const json = await response.json();
+            const logs = json as LogArray;
+            controller.logView.setLog(logs);
+        } catch (error) {
+            console.log(error);
+        }
     }
 
     async getBackupInfo(): Promise<void> {
@@ -93,65 +91,36 @@ export class Controller {
         }
     }
 
-    async updateFileList(): Promise<void> {
+    async updateSaveList(): Promise<void> {
         try {
-            const response = await fetch(PUBLIC_URL + "/files");
+            const response = await fetch(PUBLIC_URL + "/list_saves");
             const json = await response.json();
-            const filelist = json as FileList;
-            controller.fileview.setFileList(filelist, PUBLIC_URL);
+            const saves = json as SaveInfo[];
+            controller.fileview.setSaveList(saves, PUBLIC_URL);
         } catch (error) {
             console.log(error);
         }
     }
 
-    uploadFile(file: File, name: string) {
-        let current = 0;
-        let max = 100;
-        controller.progressview.addProgress("file_upload", (current / max) * 100, "Uploading File " + name + "(" + current + "/" + max + ")")
+    deleteSlot(idx: number) {
+        controller.progressview.addIndeterminate("slot_delete", "Deleting slot " + idx);
         const ajax = new XMLHttpRequest();
-        ajax.upload.addEventListener("progress", event => {
-            current = event.loaded / 1000;
-            max = event.total / 1000;
-            controller.progressview.addProgress("file_upload", (current / max) * 100, "Uploading File " + name + "(" + current + "/" + max + ")")
-        }, false);
-        ajax.addEventListener("load", () => {
-            controller.progressview.removeProgress("file_upload")
-            controller.updateFileList()
-        }, false);
-        ajax.addEventListener("error", () => {
-            alert("Error upload")
-            controller.progressview.removeProgress("file_upload")
-            controller.updateFileList()
-        }, false);
-        ajax.addEventListener("abort", () => {
-            alert("abort upload")
-            controller.progressview.removeProgress("file_upload")
-            controller.updateFileList()
-        }, false);
-        ajax.open("POST", PUBLIC_URL + "/file?filename=" + name);
-        ajax.send(file);
-    }
-
-    deleteFile(name: string) {
-        controller.progressview.addIndeterminate("file_delete", "Deleting " + name);
-        const ajax = new XMLHttpRequest();
-        ajax.open("DELETE", PUBLIC_URL + "/file?filename=" + name);
+        ajax.open("DELETE", PUBLIC_URL + "/delete_save?idx=" + idx);
         ajax.send();
         ajax.addEventListener("error", () => {
-            controller.progressview.removeProgress("file_delete")
-            alert("Error delete")
-            controller.updateFileList()
+            controller.progressview.removeProgress("slot_delete");
+            alert("Error deleting slot");
+            controller.updateSaveList();
         }, false);
         ajax.addEventListener("abort", () => {
-            controller.progressview.removeProgress("file_delete")
-            alert("Error upload")
-            controller.updateFileList()
+            controller.progressview.removeProgress("slot_delete");
+            alert("Aborted deleting slot");
+            controller.updateSaveList();
         }, false);
         ajax.addEventListener("load", () => {
-            controller.progressview.removeProgress("file_delete")
-            controller.updateFileList()
+            controller.progressview.removeProgress("slot_delete");
+            controller.updateSaveList();
         }, false);
-        controller.updateFileList()
     }
 
     async updateRTCData(): Promise<void> {
@@ -225,7 +194,7 @@ export class Controller {
 
     async version(): Promise<void> {
         controller.progressview.addIndeterminate("version", "Getting buildVersion")
-        const response = await fetch(PUBLIC_URL + "/version");
+        const response = await fetch(PUBLIC_URL + "/firmware_info");
         const json = await response.json();
         const versionInfo = json as VersionInfo;
         controller.progressview.removeProgress("version");
@@ -264,13 +233,21 @@ export class Controller {
             method: "POST",
             body: json,
         })
-            .then(response => response.text())
-            .then(text => statusCallback(text))
-            .then(_ => {
+            .then(async response => {
+                let text = response.text();
+                statusCallback(await text)
+                return response.status
+            })
+            .then(status => {
                 controller.progressview.removeProgress("set_config");
-                setTimeout(() => {
-                    controller.downloadConfig()
-                }, 250)
+                if (status == 200) {
+                    setTimeout(() => {
+                        controller.downloadConfig().then(() => {
+                            controller.updateSaveList().then(() => {
+                            });
+                        });
+                    }, 250)
+                }
             })
     }
 
@@ -327,6 +304,12 @@ export class Controller {
         })
     }
 
+    testFertilizerPump() {
+        fetch(PUBLIC_URL + "/fertilizerpumptest", {
+            method: "POST"
+        })
+    }
+
     testPlant(plantId: number) {
         let counter = 0
         let limit = 30
@@ -362,7 +345,7 @@ export class Controller {
             )
     }
 
-    async detectSensors(detection: Detection, silent: boolean = false) {
+    async detectSensors(detection: DetectionRequest, silent: boolean = false) {
         let counter = 0
         let limit = 5
         if (!silent) {
@@ -522,7 +505,7 @@ export class Controller {
 
     waitForReboot() {
         console.log("Check if controller online again")
-        fetch(PUBLIC_URL + "/version", {
+        fetch(PUBLIC_URL + "/firmware_info", {
             method: "GET",
             signal: AbortSignal.timeout(5000)
         }).then(response => {
@@ -600,7 +583,7 @@ export class Controller {
         this.hardwareView = new HardwareConfigView(this)
         this.detectBtn = document.getElementById("detect_sensors") as HTMLButtonElement
         this.detectBtn.onclick = () => {
-            const detection: Detection = {
+            const detection: DetectionRequest = {
                 plant: Array.from({length: PLANT_COUNT}, () => ({
                     sensor_a: true,
                     sensor_b: true,
@@ -638,7 +621,7 @@ export class Controller {
 
         try {
             await this.measure_moisture(true);
-            const detection: Detection = {
+            const detection: DetectionRequest = {
                 plant: Array.from({length: PLANT_COUNT}, () => ({
                     sensor_a: true,
                     sensor_b: true,
@@ -668,7 +651,7 @@ const tasks = [
     {task: controller.updateSolarData, displayString: "Updating Solar Data"},
     {task: controller.downloadConfig, displayString: "Downloading Configuration"},
     {task: controller.version, displayString: "Fetching Version Information"},
-    {task: controller.updateFileList, displayString: "Updating File List"},
+    {task: controller.updateSaveList, displayString: "Updating Save Slots"},
     {task: controller.getBackupInfo, displayString: "Fetching Backup Information"},
     {task: controller.loadLogLocaleConfig, displayString: "Loading Log Localization Config"},
     {task: controller.loadTankInfo, displayString: "Loading Tank Information"},
@@ -690,8 +673,9 @@ async function executeTasksSequentially() {
     }
 }
 
-executeTasksSequentially().then(r => {
-    controller.progressview.removeProgress("initial")
+executeTasksSequentially().then(() => {
+    controller.progressview.removeProgress("initial");
+    controller.logView.startLivePoll(PUBLIC_URL);
 });
 
 controller.progressview.removeProgress("rebooting");
diff --git a/Software/MainBoard/rust/src_webpack/src/ota.html b/Software/MainBoard/rust/src_webpack/src/ota.html
index 0d18370..9c95f8e 100644
--- a/Software/MainBoard/rust/src_webpack/src/ota.html
+++ b/Software/MainBoard/rust/src_webpack/src/ota.html
@@ -21,6 +21,7 @@
     <div class="subtitle">
         Current Firmware
     </div>
+    <button style="margin-left: auto;" type="button" id="refresh_firmware_info">Refresh</button>
 </div>
 <div class="flexcontainer">
     <span class="otakey">Buildtime:</span>
@@ -42,12 +43,35 @@
     <span class="otakey">State1:</span>
     <span class="otavalue" id="firmware_state1"></span>
 </div>
-
 <div class="flexcontainer">
     <form class="otaform" id="upload_form" method="post">
         <input class="otachooser" type="file" name="file1" id="firmware_file"><br>
     </form>
 </div>
+<div class="flexcontainer">
+    <div class="subtitle">
+        Heap Memory
+    </div>
+    <div></div>
+</div>
+<div class="flexcontainer">
+    <span class="otakey">Free:</span>
+    <span class="otavalue" id="heap_free"></span>
+</div>
+<div class="flexcontainer">
+    <span class="otakey">Used:</span>
+    <span class="otavalue" id="heap_used"></span>
+</div>
+<div class="flexcontainer">
+    <span class="otakey">Total:</span>
+    <span class="otavalue" id="heap_total"></span>
+</div>
+<div class="flexcontainer">
+    <span class="otakey">Peak used:</span>
+    <span class="otavalue" id="heap_max_used"></span>
+</div>
+
+
 <div class="display:flex">
     <button style="margin-left: 16px; margin-top: 8px;" class="col-6" type="button" id="test">Self-Test</button>
 </div>
\ No newline at end of file
diff --git a/Software/MainBoard/rust/src_webpack/src/ota.ts b/Software/MainBoard/rust/src_webpack/src/ota.ts
index c407932..b7c6f69 100644
--- a/Software/MainBoard/rust/src_webpack/src/ota.ts
+++ b/Software/MainBoard/rust/src_webpack/src/ota.ts
@@ -1,6 +1,10 @@
 import {Controller} from "./main";
 import {VersionInfo} from "./api";
 
+function fmtBytes(n: number): string {
+    return `${n} B (${(n / 1024).toFixed(1)} KiB)`;
+}
+
 export class OTAView {
     readonly file1Upload: HTMLInputElement;
     readonly firmware_buildtime: HTMLDivElement;
@@ -8,19 +12,26 @@ export class OTAView {
     readonly firmware_partition: HTMLDivElement;
     readonly firmware_state0: HTMLDivElement;
     readonly firmware_state1: HTMLDivElement;
+    readonly heap_free: HTMLDivElement;
+    readonly heap_used: HTMLDivElement;
+    readonly heap_total: HTMLDivElement;
+    readonly heap_max_used: HTMLDivElement;
 
     constructor(controller: Controller) {
         (document.getElementById("firmwareview") as HTMLElement).innerHTML = require("./ota.html")
 
         let test = document.getElementById("test") as HTMLButtonElement;
+        let refresh = document.getElementById("refresh_firmware_info") as HTMLButtonElement;
 
         this.firmware_buildtime = document.getElementById("firmware_buildtime") as HTMLDivElement;
         this.firmware_githash = document.getElementById("firmware_githash") as HTMLDivElement;
         this.firmware_partition = document.getElementById("firmware_partition") as HTMLDivElement;
-
         this.firmware_state0 = document.getElementById("firmware_state0") as HTMLDivElement;
         this.firmware_state1 = document.getElementById("firmware_state1") as HTMLDivElement;
-
+        this.heap_free = document.getElementById("heap_free") as HTMLDivElement;
+        this.heap_used = document.getElementById("heap_used") as HTMLDivElement;
+        this.heap_total = document.getElementById("heap_total") as HTMLDivElement;
+        this.heap_max_used = document.getElementById("heap_max_used") as HTMLDivElement;
 
         const file = document.getElementById("firmware_file") as HTMLInputElement;
         this.file1Upload = file
@@ -36,6 +47,10 @@ export class OTAView {
         test.onclick = () => {
             controller.selfTest();
         }
+
+        refresh.onclick = () => {
+            controller.version();
+        }
     }
 
     setVersion(versionInfo: VersionInfo) {
@@ -44,5 +59,9 @@ export class OTAView {
         this.firmware_partition.innerText = versionInfo.current;
         this.firmware_state0.innerText = versionInfo.slot0_state;
         this.firmware_state1.innerText = versionInfo.slot1_state;
+        this.heap_free.innerText = fmtBytes(versionInfo.heap_free);
+        this.heap_used.innerText = fmtBytes(versionInfo.heap_used);
+        this.heap_total.innerText = fmtBytes(versionInfo.heap_total);
+        this.heap_max_used.innerText = fmtBytes(versionInfo.heap_max_used);
     }
 }
\ No newline at end of file
diff --git a/Software/MainBoard/rust/src_webpack/src/plant.html b/Software/MainBoard/rust/src_webpack/src/plant.html
index f4737fc..1ef21b6 100644
--- a/Software/MainBoard/rust/src_webpack/src/plant.html
+++ b/Software/MainBoard/rust/src_webpack/src/plant.html
@@ -78,6 +78,16 @@
         <input class="plantvalue" id="plant_${plantId}_pump_cooldown_min" type="number" min="0" max="600"
                placeholder="30">
     </div>
+    <div class="flexcontainer plantPumpEnabledOnly_${plantId}">
+        <div class="plantkey">Fertilizer (s):</div>
+        <input class="plantvalue" id="plant_${plantId}_fertilizer_s" type="number" min="0" max="60"
+               placeholder="0">
+    </div>
+    <div class="flexcontainer plantPumpEnabledOnly_${plantId}">
+        <div class="plantkey">Fertilizer Cooldown (m):</div>
+        <input class="plantvalue" id="plant_${plantId}_fertilizer_cooldown_min" type="number" min="0" max="20160"
+               placeholder="1440">
+    </div>
     <div class="flexcontainer plantPumpEnabledOnly_${plantId}">
         <div class="plantkey">"Pump Hour Start":</div>
         <select class="plantvalue" id="plant_${plantId}_pump_hour_start">10</select>
@@ -126,17 +136,25 @@
         <div class="subtitle">Live:</div>
     </div>
     <div class="flexcontainer plantSensorEnabledOnly_${plantId}">
-        <button class="subtitle" id="plant_${plantId}_test_sensor_a">Test Sensor A</button>
-        <button class="subtitle" id="plant_${plantId}_test_sensor_b">Test Sensor B</button>
+        <button class="subtitle" id="plant_${plantId}_test_sensor_a">Identify Sensor A</button>
+        <button class="subtitle" id="plant_${plantId}_test_sensor_b">Identify Sensor B</button>
     </div>
     <div class="flexcontainer plantSensorEnabledOnly_${plantId}">
         <span class="plantsensorkey">Sensor A:</span>
         <span class="plantsensorvalue" id="plant_${plantId}_moisture_a">not measured</span>
     </div>
+    <div class="flexcontainer plantSensorEnabledOnly_${plantId}">
+        <span class="plantsensorkey">Sensor A FW:</span>
+        <span class="plantsensorvalue" id="plant_${plantId}_sensor_a_fw_build">unknown</span>
+    </div>
     <div class="flexcontainer plantSensorEnabledOnly_${plantId}">
         <div class="plantsensorkey">Sensor B:</div>
         <span class="plantsensorvalue" id="plant_${plantId}_moisture_b">not measured</span>
     </div>
+    <div class="flexcontainer plantSensorEnabledOnly_${plantId}">
+        <span class="plantsensorkey">Sensor B FW:</span>
+        <span class="plantsensorvalue" id="plant_${plantId}_sensor_b_fw_build">unknown</span>
+    </div>
     <div class="flexcontainer plantPumpEnabledOnly_${plantId}">
         <div class="plantsensorkey">Max Current</div>
         <span class="plantsensorvalue" id="plant_${plantId}_pump_test_current_max">not_tested</span>
diff --git a/Software/MainBoard/rust/src_webpack/src/plant.ts b/Software/MainBoard/rust/src_webpack/src/plant.ts
index 702e282..4c763fc 100644
--- a/Software/MainBoard/rust/src_webpack/src/plant.ts
+++ b/Software/MainBoard/rust/src_webpack/src/plant.ts
@@ -1,7 +1,14 @@
-import {DetectionPlant, Detection, PlantConfig, PumpTestResult} from "./api";
+import {Detection, DetectionPlant, DetectionRequest, PlantConfig, PumpTestResult} from "./api";
 
 export const PLANT_COUNT = 8;
 
+/** Format a firmware build timestamp (minutes since Unix epoch) as a human-readable date/time. */
+function formatBuildMinutes(buildMinutes: number | null): string {
+    if (buildMinutes === null) return "not detected";
+    if (buildMinutes === 0) return "detected (no timestamp)";
+    const ms = buildMinutes * 60 * 1000;
+    return new Date(ms).toISOString().replace("T", " ").slice(0, 16) + " UTC";
+}
 
 import {Controller} from "./main";
 
@@ -72,6 +79,8 @@ export class PlantView {
     private readonly minMoisture: HTMLInputElement;
     private readonly pumpTimeS: HTMLInputElement;
     private readonly pumpCooldown: HTMLInputElement;
+    private readonly fertilizerS: HTMLInputElement;
+    private readonly fertilizerCooldownMin: HTMLInputElement;
     private readonly pumpHourStart: HTMLSelectElement;
     private readonly pumpHourEnd: HTMLSelectElement;
     private readonly sensorAInstalled: HTMLInputElement;
@@ -79,6 +88,8 @@ export class PlantView {
     private readonly mode: HTMLSelectElement;
     private readonly moistureA: HTMLElement;
     private readonly moistureB: HTMLElement;
+    private readonly sensorAFwBuild: HTMLElement;
+    private readonly sensorBFwBuild: HTMLElement;
     private readonly maxConsecutivePumpCount: HTMLInputElement;
     private readonly minPumpCurrentMa: HTMLInputElement;
     private readonly maxPumpCurrentMa: HTMLInputElement;
@@ -109,6 +120,8 @@ export class PlantView {
 
         this.moistureA = document.getElementById("plant_" + plantId + "_moisture_a")! as HTMLElement;
         this.moistureB = document.getElementById("plant_" + plantId + "_moisture_b")! as HTMLElement;
+        this.sensorAFwBuild = document.getElementById("plant_" + plantId + "_sensor_a_fw_build")! as HTMLElement;
+        this.sensorBFwBuild = document.getElementById("plant_" + plantId + "_sensor_b_fw_build")! as HTMLElement;
 
         this.pump_test_current_max = document.getElementById("plant_" + plantId + "_pump_test_current_max")! as HTMLElement;
         this.pump_test_current_min = document.getElementById("plant_" + plantId + "_pump_test_current_min")! as HTMLElement;
@@ -124,7 +137,7 @@ export class PlantView {
 
         this.testSensorAButton = document.getElementById("plant_" + plantId + "_test_sensor_a")! as HTMLButtonElement;
         this.testSensorAButton.onclick = () => {
-            const detection: Detection = {
+            const detection: DetectionRequest = {
                 plant: Array.from({length: PLANT_COUNT}, (_v, idx) => ({
                     sensor_a: idx === plantId,
                     sensor_b: false,
@@ -135,7 +148,7 @@ export class PlantView {
 
         this.testSensorBButton = document.getElementById("plant_" + plantId + "_test_sensor_b")! as HTMLButtonElement;
         this.testSensorBButton.onclick = () => {
-            const detection: Detection = {
+            const detection: DetectionRequest = {
                 plant: Array.from({length: PLANT_COUNT}, (_v, idx) => ({
                     sensor_a: false,
                     sensor_b: idx === plantId,
@@ -169,6 +182,16 @@ export class PlantView {
             controller.configChanged()
         }
 
+        this.fertilizerS = document.getElementById("plant_" + plantId + "_fertilizer_s") as HTMLInputElement;
+        this.fertilizerS.onchange = function () {
+            controller.configChanged()
+        }
+
+        this.fertilizerCooldownMin = document.getElementById("plant_" + plantId + "_fertilizer_cooldown_min") as HTMLInputElement;
+        this.fertilizerCooldownMin.onchange = function () {
+            controller.configChanged()
+        }
+
         this.pumpHourStart = document.getElementById("plant_" + plantId + "_pump_hour_start") as HTMLSelectElement;
         this.pumpHourStart.onchange = function () {
             controller.configChanged()
@@ -317,6 +340,8 @@ export class PlantView {
         this.minMoisture.value = plantConfig.min_moisture?.toString() || "";
         this.pumpTimeS.value = plantConfig.pump_time_s.toString();
         this.pumpCooldown.value = plantConfig.pump_cooldown_min.toString();
+        this.fertilizerS.value = plantConfig.fertilizer_s?.toString() || "0";
+        this.fertilizerCooldownMin.value = plantConfig.fertilizer_cooldown_min?.toString() || "1440";
         this.pumpHourStart.value = plantConfig.pump_hour_start.toString();
         this.pumpHourEnd.value = plantConfig.pump_hour_end.toString();
         this.sensorBInstalled.checked = plantConfig.sensor_b;
@@ -344,6 +369,8 @@ export class PlantView {
             pump_time_s: this.pumpTimeS.valueAsNumber,
             pump_limit_ml: 5000,
             pump_cooldown_min: this.pumpCooldown.valueAsNumber,
+            fertilizer_s: this.fertilizerS.valueAsNumber || 0,
+            fertilizer_cooldown_min: this.fertilizerCooldownMin.valueAsNumber || 1440,
             pump_hour_start: +this.pumpHourStart.value,
             pump_hour_end: +this.pumpHourEnd.value,
             sensor_b: this.sensorBInstalled.checked,
@@ -360,19 +387,23 @@ export class PlantView {
     }
 
     setDetectionResult(plantResult: DetectionPlant) {
-        console.log("setDetectionResult plantResult: " + plantResult.sensor_a + " " + plantResult.sensor_b)
+        const sensorADetected = plantResult.sensor_a !== null;
+        const sensorBDetected = plantResult.sensor_b !== null;
+        console.log("setDetectionResult plantResult: a=" + plantResult.sensor_a + " b=" + plantResult.sensor_b);
         var changed = false;
-        if (this.sensorAInstalled.checked != plantResult.sensor_a) {
+        if (this.sensorAInstalled.checked != sensorADetected) {
             changed = true;
-            this.sensorAInstalled.checked = plantResult.sensor_a;
+            this.sensorAInstalled.checked = sensorADetected;
         }
-        if (this.sensorBInstalled.checked != plantResult.sensor_b) {
+        if (this.sensorBInstalled.checked != sensorBDetected) {
             changed = true;
-            this.sensorBInstalled.checked = plantResult.sensor_b;
+            this.sensorBInstalled.checked = sensorBDetected;
         }
         if (changed) {
             this.controller.configChanged();
         }
 
+        this.sensorAFwBuild.innerText = formatBuildMinutes(plantResult.sensor_a);
+        this.sensorBFwBuild.innerText = formatBuildMinutes(plantResult.sensor_b);
     }
 }
\ No newline at end of file
diff --git a/Software/MainBoard/rust/src_webpack/src/submitView.ts b/Software/MainBoard/rust/src_webpack/src/submitView.ts
index 6cf6b60..55ef5e4 100644
--- a/Software/MainBoard/rust/src_webpack/src/submitView.ts
+++ b/Software/MainBoard/rust/src_webpack/src/submitView.ts
@@ -28,11 +28,11 @@ export class SubmitView {
             controller.uploadConfig(this.json.textContent as string, (status: string) => {
                 if (status != "OK") {
                     // Show error toast (click to dismiss only)
-                    const { toast } = require('./toast');
+                    const {toast} = require('./toast');
                     toast.error(status);
                 } else {
                     // Show info toast (auto hides after 5s, or click to dismiss sooner)
-                    const { toast } = require('./toast');
+                    const {toast} = require('./toast');
                     toast.info('Config uploaded successfully');
                 }
                 this.submit_status.innerHTML = status;
diff --git a/Software/Shared/canapi/src/lib.rs b/Software/Shared/canapi/src/lib.rs
index 9a119c3..c06c248 100644
--- a/Software/Shared/canapi/src/lib.rs
+++ b/Software/Shared/canapi/src/lib.rs
@@ -43,6 +43,7 @@ pub mod id {
     // Message group base offsets relative to SENSOR_BASE_ADDRESS
     pub const MOISTURE_DATA_OFFSET: u16 = 0; // periodic data from sensor (sensor -> controller)
     pub const IDENTIFY_CMD_OFFSET: u16 = 32; // identify LED command (controller -> sensor)
+    pub const FIRMWARE_BUILD_OFFSET: u16 = 64; // firmware build timestamp (sensor -> controller, sent after identify)
 
     #[inline]
     pub const fn plant_id(message_type_offset: u16, sensor: SensorSlot, plant: u16) -> u16 {
@@ -55,8 +56,9 @@ pub mod id {
     /// Kinds of message spaces recognized by the addressing scheme.
     #[derive(Debug, Clone, Copy, PartialEq, Eq)]
     pub enum MessageKind {
-        MoistureData, // sensor -> controller
-        IdentifyCmd,  // controller -> sensor
+        MoistureData,    // sensor -> controller
+        IdentifyCmd,     // controller -> sensor
+        FirmwareBuild,   // sensor -> controller, sent after receiving identify cmd
     }
 
     /// Try to classify a received 11-bit standard ID into a known message kind and extract plant and sensor slot.
@@ -93,6 +95,9 @@ pub mod id {
         if let Some((plant, slot)) = decode_in_group(rel, IDENTIFY_CMD_OFFSET) {
             return Some((MessageKind::IdentifyCmd, plant, slot));
         }
+        if let Some((plant, slot)) = decode_in_group(rel, FIRMWARE_BUILD_OFFSET) {
+            return Some((MessageKind::FirmwareBuild, plant, slot));
+        }
         None
     }