extract rtc module, extract tank module, fix backupview refresh, switch to embedded storage for eeprom

rust/src/webserver/mod.rs

@@ -8,7 +8,7 @@ use crate::{
     plant_state::{MoistureSensorState, PlantState},
     BOARD_ACCESS,
 };
-use anyhow::bail;
+use anyhow::{bail, Context};
 use chrono::DateTime;
 use core::result::Result::Ok;
 use embedded_svc::http::Method;
@@ -60,7 +60,7 @@ pub struct TestPump {
 #[derive(Serialize, Deserialize, PartialEq, Debug)]
 pub struct WebBackupHeader {
     timestamp: std::string::String,
-    size: usize,
+    size: u16,
 }
 
 #[derive(Deserialize)]
@@ -208,10 +208,9 @@ fn backup_info(
             };
             serde_json::to_string(&wbh)?
         }
-        Err(_) => {
-            //TODO make better
+        Err(err) => {
             let wbh = WebBackupHeader {
-                timestamp: "no backup".to_owned(),
+                timestamp: err.to_string(),
                 size: 0,
             };
             serde_json::to_string(&wbh)?
@@ -286,7 +285,12 @@ fn tank_info(
     let mut board = BOARD_ACCESS.lock().unwrap();
     let tank_info = determine_tank_state(&mut board);
     //should be multsampled
-    let water_temp = board.board_hal.water_temperature_c();
+
+    let water_temp = board
+        .board_hal
+        .get_tank_sensor()
+        .context("no sensor")
+        .and_then(|f| f.water_temperature_c());
     Ok(Some(serde_json::to_string(&tank_info.as_mqtt_info(
         &board.board_hal.get_config().tank,
         &water_temp,