use thiserror for protocol error type

lib-bms-protocol/Cargo.toml

@@ -5,6 +5,7 @@ edition = "2024"
 
 [dependencies]
 embedded-hal = "1.0.0"
+thiserror = { version = "2.0.17", default-features = false }
 
 
 [profile.dev]

lib-bms-protocol/src/lib.rs

@@ -1,6 +1,7 @@
 #![no_std]
 
 use embedded_hal::i2c::{I2c, Operation, SevenBitAddress};
+use thiserror::Error;
 
 pub const BMS_I2C_ADDRESS: u8 = 0x55;
 
@@ -17,7 +18,9 @@ pub trait BmsWriteable {
         I: I2c<SevenBitAddress>;
 }
 
+#[derive(Debug, Error)]
 pub enum BmsProtocolError {
+    #[error("i2c communication failed")]
     I2cCommunicationError,
 }