feat: implement config update via MQTT trigger

rust/src/mqtt.rs

@@ -4,7 +4,7 @@ use crate::fat_error::{ContextExt, FatError, FatResult};
 use crate::hal::PlantHal;
 use crate::log::{log, LogMessage};
 use alloc::string::String;
-use alloc::{format, string::ToString};
+use alloc::{format, string::ToString, vec::Vec};
 use core::sync::atomic::Ordering;
 use embassy_executor::Spawner;
 use embassy_net::Stack;
@@ -145,6 +145,7 @@ pub async fn mqtt_init(
     let round_trip_topic = format!("{base_topic}/internal/roundtrip");
     let stay_alive_topic = format!("{base_topic}/stay_alive");
     let config_update_payload_topic = format!("{base_topic}/config/update_payload");
+    let config_update_topic = format!("{base_topic}/config/update");
 
     let mut builder: McutieBuilder<'_, String, PublishDisplay<String, &str>, 0> =
         McutieBuilder::new(stack, "plant ctrl", mqtt_url);
@@ -163,11 +164,12 @@ pub async fn mqtt_init(
     //TODO make configurable
     builder = builder.with_device_id("plantctrl");
 
-    let builder: McutieBuilder<'_, String, PublishDisplay<String, &str>, 3> = builder
+    let builder: McutieBuilder<'_, String, PublishDisplay<String, &str>, 4> = builder
         .with_subscriptions([
             Topic::General(round_trip_topic.clone()),
             Topic::General(stay_alive_topic.clone()),
             Topic::General(config_update_payload_topic.clone()),
+            Topic::General(config_update_topic.clone()),
         ]);
 
     let keep_alive = Duration::from_secs(60 * 60 * 2).as_secs() as u16;
@@ -178,6 +180,7 @@ pub async fn mqtt_init(
         round_trip_topic.clone(),
         stay_alive_topic.clone(),
         config_update_payload_topic.clone(),
+        config_update_topic.clone(),
     )?);
     spawner.spawn(mqtt_runner(task)?);
 
@@ -224,7 +227,7 @@ pub async fn mqtt_init(
 
 #[embassy_executor::task]
 async fn mqtt_runner(
-    task: McutieTask<'static, String, PublishDisplay<'static, String, &'static str>, 3>,
+    task: McutieTask<'static, String, PublishDisplay<'static, String, &'static str>, 4>,
 ) {
     task.run().await;
 }
@@ -235,6 +238,7 @@ async fn mqtt_incoming_task(
     round_trip_topic: String,
     stay_alive_topic: String,
     config_update_payload_topic: String,
+    config_update_topic: String,
 ) {
     loop {
         let message = receiver.receive().await;
@@ -265,6 +269,35 @@ async fn mqtt_incoming_task(
                         let mut buffer = MQTT_CONFIG_UPDATE_PAYLOAD.lock().await;
                         *buffer = Some(payload_str);
                         info!("MQTT config update payload received");
+                    } else if subtopic.eq(config_update_topic.as_str()) {
+                        let update_requested = payload.eq_ignore_ascii_case("true".as_ref())
+                            || payload.eq_ignore_ascii_case("1".as_ref());
+                        if update_requested {
+                            info!("MQTT config update requested");
+                            let payload_lock = MQTT_CONFIG_UPDATE_PAYLOAD.lock().await;
+                            if let Some(payload_str) = payload_lock.as_ref() {
+                                match serde_json::from_str::<crate::config::PlantControllerConfig>(payload_str) {
+                                    Ok(config) => {
+                                        info!("Deserialized config, applying...");
+                                let board_mutex = crate::BOARD_ACCESS.get().await;
+                                let mut board = board_mutex.lock().await;
+                                if let Err(e) = board.board_hal.get_esp().save_config(payload_str.as_bytes().to_vec()).await {
+                                    info!("Error saving config to flash: {}", e);
+                                } else {
+                                    board.board_hal.set_config(config);
+                                    info!("Config applied, rebooting");
+                                    board.board_hal.get_esp().deep_sleep_ms(0);
+                                }
+
+                                    }
+                                    Err(e) => {
+                                        info!("Error deserializing config: {}", e);
+                                    }
+                                }
+                            } else {
+                                info!("No config update payload available");
+                            }
+                        }
                     } else {
                         log(LogMessage::UnknownTopic, 0, 0, "", &topic);
                     }