cleanup main and network state handling

rust/src/tank.rs

@@ -119,7 +119,7 @@ impl TankState {
     pub fn as_mqtt_info(
         &self,
         config: &TankConfig,
-        water_temp: Result<f32, anyhow::Error>,
+        water_temp: &anyhow::Result<f32>,
     ) -> TankInfo {
         let mut tank_err: Option<TankError> = None;
         let left_ml = match self.left_ml(config) {
@@ -151,7 +151,7 @@ impl TankState {
                 .as_ref()
                 .is_ok_and(|temp| *temp < WATER_FROZEN_THRESH),
             water_temp: water_temp.as_ref().copied().ok(),
-            temp_sensor_error: water_temp.err().map(|err| err.to_string()),
+            temp_sensor_error: water_temp.as_ref().err().map(|err| err.to_string()),
             percent,
         }
     }