Bluetooth

class MainActivity : ComponentActivity(), View.OnClickListener {
  ...

  // colocar o bluetoothInstance como variável global
  private val bluetoothInstance = Bluetooth()

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)

    binding = ActivityMainBinding.inflate(layoutInflater)
    setContentView(binding.root)

    // setar o contexto
    bluetoothInstance.setContext(this, "seu_endereco_mac")

    // iniciar o serviço do bluetooth
    bluetoothInstance.startBluetoothService()

    // mandar mensagem com o bluetooth
    bluetoothInstance.send("sua_mensagem")