E220 Chat

E220 Chat is a Jetpack Compose Android client for an ESP32 + Ebyte E220 companion firmware. It connects to the ESP32 over BLE, exchanges a binary framed protocol, and provides a chat-first UI for radio messaging, radio configuration, WiFi control, and diagnostics.

This repository includes:

Android app in app/ ESP32 companion firmware in firmware/esp32-e220-fw/ Protocol notes in BLE_LAYER_V2.md Features Chat tab with BLE scan/connect, reconnect, message history, and a composer that supports slash commands Slash commands for /gps, /clear, and /name Radio tab with E220 configuration fields backed by the manual and exposed as dropdowns where appropriate WiFi tab for viewing and changing ESP32 WiFi state, scanning for networks, AP/STA settings, and connection status Debug tab for device diagnostics and runtime status Material 3 UI with light and dark theme support Binary BLE transport with MTU-aware chunking, ACK retry, and notification-driven updates Requirements Android 8.0+ (minSdk 26) A BLE-capable Android phone An ESP32 running the matching companion firmware Bluetooth permissions on Android 12+ Location permission if you use /gps or scan on older Android versions