adda lot of basic webserver back

rust/src/hal/battery.rs

@@ -1,6 +1,7 @@
 use crate::hal::Box;
 use alloc::string::String;
 use async_trait::async_trait;
+use core::error::Error;
 use serde::Serialize;
 
 #[async_trait]
@@ -17,6 +18,12 @@ pub trait BatteryInteraction {
     async fn get_battery_state(&mut self) -> Result<BatteryState, BatteryError>;
 }
 
+impl From<BatteryError> for anyhow::Error {
+    fn from(err: BatteryError) -> Self {
+        anyhow::anyhow!(err)
+    }
+}
+
 #[derive(Debug, Serialize)]
 pub struct BatteryInfo {
     pub voltage_milli_volt: u16,