- MainActivity: suppress toast when activity not resumed, auto-navigate to
Settings on new firmware
- SettingsActivity: unified BLE/USB radio buttons + single update button,
version check before OTA, show dialog before loadFirmware, spinner timeout
- BleRelayManager: expose getEspVersion()
- OtaManager: reduce chunk size 500→248 to fit BLE MTU 255
- ESP: WRITE→WRITE_NR on OTA characteristic (was silently dropping data)
- Layout/strings: remove intro text, add method radio buttons
- Bump all firmware versions to v5
- Firmware: add VERSION? command returning BUILD_NR for version check
- Android: flash button checks firmware version first, skips flash if current
- After flash: auto key exchange via reboot detection (expectingReboot flag)
- device_filter.xml + intent-filter: USB permission 'always allow' checkbox
- singleTop + onNewIntent prevents unwanted SettingsActivity launch on USB connect
- platformio.ini: upload_port updated to /dev/ttyACM1
- Firmware: add explicit setScanResponseData with setCompleteServices for
128-bit service UUID so Android ScanFilter finds the device
- Android: hexStringToBytes accepts any even-length hex (fixes UUID=32chars
failing the hardcoded 64-char check)
- Android: onActivityResult matches SettingsActivity.RESULT_SCAN instead of
Activity.RESULT_OK
