Android蓝牙与arduino的连接

Question

我与arduino的蓝牙连接有问题，这是我第一次尝试通过蓝牙将apk与设备连接。 问题是，第一次使用按钮后，必须向设备发送消息“ on” /“ off”（无论是哪个，但对于第一个消息都很重要），设备才能正常工作。 但是之后，我无法再次发送消息，只是敬酒我“请重启您的蓝牙”-btSocket不再连接。 有什么想法或建议吗？ 感谢帮助。

public class BluetoothList extends AppCompatActivity {

    private BluetoothAdapter bAdapter = BluetoothAdapter.getDefaultAdapter();
    private ListView listView;
    private String[] sName, sAddress;
    private BluetoothAdapter myBluetooth;
    private BluetoothSocket btSocket = null;
    private BluetoothDevice dispositivo;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_bluetooth_list);
         listView = findViewById(R.id.lvBluetooth);
        turningOn();

        if(bAdapter==null){
            Toast.makeText(getApplicationContext(),"Bluetooth Not Supported",Toast.LENGTH_SHORT).show();
        }
        else{
            Set<BluetoothDevice> pairedDevices = bAdapter.getBondedDevices();
            ArrayList address = new ArrayList();
            ArrayList name = new ArrayList();
            if(pairedDevices.size()>0){
                for(BluetoothDevice device: pairedDevices)
                {
                    String devicename = device.getName();
                    String macAddress = device.getAddress();
                    address.add(macAddress);
                    name.add(devicename);
                }
                sName = (String[]) name.toArray(new String[0]);
                sAddress = (String[]) address.toArray(new String[0]);
                BluetoothLVAdapter bAdapter = new BluetoothLVAdapter(this, sName, sAddress);
                listView.setAdapter(bAdapter);

            }
        }

    }

    private void turningOn()
    {
        Button trnOn = findViewById(R.id.btn_turnON);
        Button trnOFF = findViewById(R.id.btn_turnOFF);
        trnOn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v)
            {
                BluetoothConnection();
                if (btSocket.isConnected()){

                    try {
                        btSocket.getOutputStream().write("on".getBytes());
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }else{
                    Toast.makeText(getApplicationContext(), "Reboot your bluetooth please", Toast.LENGTH_SHORT).show();
                }


                }
        });
        trnOFF.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v)
            {
                BluetoothConnection();
                if (btSocket.isConnected()){
                    try {
                        btSocket.getOutputStream().write("off".getBytes());
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }else{
                    Toast.makeText(getApplicationContext(), "Reboot your bluetooth please", Toast.LENGTH_SHORT).show();
                }
            }
        });
    }

    private void BluetoothConnection()
    {
        myBluetooth = BluetoothAdapter.getDefaultAdapter();//get the mobile bluetooth device
        dispositivo = myBluetooth.getRemoteDevice(sAddress[0]);//connects to the device's address and checks if it's available
        try {
            btSocket = dispositivo.createInsecureRfcommSocketToServiceRecord(myUUID);//create a RFCOMM (SPP) connection
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            btSocket.connect();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


}