cleanup

mqtt_display/src/bus/mod.rs

@@ -1,4 +1,6 @@
 // src/bus/mod.rs
+//! Shared access to the hardware I2C peripheral on a
+//! single core.
 
 use core::cell::RefCell;
 use embedded_hal_bus::i2c::RefCellDevice;

mqtt_display/src/contracts.rs

@@ -1,10 +1,9 @@
 // src/contracts.rs
 //! Cross-feature message contracts.
 //! 
-//! This is the ONLY coupling point between features.
 //! Features depend on these types, not on each other.
 
-use heapless::String as HString;
+use heapless::String;
 use pages_tui::input::Key;
 
 /// IMU sensor reading from MPU6050
@@ -20,17 +19,13 @@ pub struct ImuReading {
 /// Commands that can be sent to the display actor
 #[derive(Clone, Debug)]
 pub enum DisplayCommand {
-    /// Show IMU sensor data
     SetImu(ImuReading),
-    /// Show a status line (max 32 chars)
-    SetStatus(HString<32>),
-    /// Show an error message (max 64 chars)
-    ShowError(HString<64>),
-    /// Show MQTT connection status
+    SetStatus(String<32>),
+    ShowError(String<64>),
     SetMqttStatus { connected: bool, msg_count: u32 },
     /// Clear the display to default state
     Clear,
 
     PushKey(Key),
-    AddChatMessage(HString<24>),
+    AddChatMessage(String<24>),
 }