How to solve the error onClientConnectionState() - status=22 clientIf=7 in BLE

Question

I have an Android application which uses Bluetooth Low Energy (BLE) to connect with my phone. The application worked well in almost all phones such as Galaxy S5 (Android 5.0.1), Galaxy S6 (Android 6.0). However, it has a critical issue in Galaxy Note 3 (Android 5.0.1).

When I call the connect() function, and then call the readCharacteristic(), it returns the error:

onClientConnectionState() - status=22 clientIf=7

The error happens after I call the connect function for about 2 seconds. I look up some solution, such as making a delay before calling readCharacteristic(), but it cannot solve.

Could you have any way to solve my issue?

Thank all.

This is my code:

 private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {    @Override    public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {                   if (newState == BluetoothProfile.STATE_CONNECTED) {                        mBluetoothGatt.discoverServices();            } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {}      }       @Override      public void onServicesDiscovered(BluetoothGatt gatt, int status) {        if (status == BluetoothGatt.GATT_SUCCESS) {           try {             Thread.sleep(500);             readCharacteristic();           } catch (InterruptedException e) {             e.printStackTrace();           }         } else {            Log.w(TAG, "onServicesDiscovered received: " + status);        }      }       @Override      public void onCharacteristicRead(BluetoothGatt gatt,                                          BluetoothGattCharacteristic characteristic,                                          int status) {                 }       @Override      public void onCharacteristicChanged(BluetoothGatt gatt,                                             BluetoothGattCharacteristic characteristic) {                  }  };   public void readCharacteristic() {    /*check if the service is available on the device*/    BluetoothGattService mCustomService = mBluetoothGatt.getService(UUID.fromString("00001c00-d102-11e1-9b23-00025b00123"));    /*get the read characteristic from the service*/    BluetoothGattCharacteristic mReadCharacteristic = mCustomService.getCharacteristic(UUID.fromString("00001233-d102-11e1-9b23-00025b00a5a5"));    mBluetoothGatt.setCharacteristicNotification(mReadCharacteristic, true);    BluetoothGattDescriptor descriptor = mReadCharacteristic.getDescriptor(                 UUID.fromString(SampleGattAttributes.CLIENT_CHARACTERISTIC_CONFIG));    descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);    mBluetoothGatt.writeDescriptor(descriptor);  } 

This is my full service function file to connect BLE

public class ConnectionService extends Service{     private BluetoothLeService mBluetoothLeService;     public String mDeviceAddress="0A:1B:6C:22:11:3D";     private ServiceMonitor serviceMonitor = ServiceMonitor.getInstance();     private final ServiceConnection mServiceConnection = new ServiceConnection() {          @Override         public void onServiceConnected(ComponentName componentName, IBinder service) {                        mBluetoothLeService = ((BluetoothLeService.LocalBinder) service).getService();             if (!mBluetoothLeService.initialize()) {                 Log.e(TAG, "Unable to initialize Bluetooth");             }             mBluetoothLeService.connect(mDeviceAddress);         }         @Override         public void onServiceDisconnected(ComponentName componentName) {             mBluetoothLeService = null;         }     };      @Override     public void onCreate() {         super.onCreate();             }      @Override     public IBinder onBind(Intent intent) {         return null;     }     @Override     public void onDestroy() {         if(mGattUpdateReceiver!=null) {             unregisterReceiver(mGattUpdateReceiver);         }         if(mServiceConnection!=null) {             unbindService(mServiceConnection);         }     }       @Override     public int onStartCommand(Intent intent, int flags, int startId)     {               //If some device is connecting to phone, let disconnect          if(mConnected==true) {             mBluetoothLeService.disconnect();                    }          //If bluetooth is enable             if (BleUtils.getBluetoothAdapter(getApplicationContext()).enable()) {             Intent gattServiceIntent = new Intent(this, BluetoothLeService.class);             bindService(gattServiceIntent, mServiceConnection, BIND_AUTO_CREATE);             registerReceiver(mGattUpdateReceiver, makeGattUpdateIntentFilter());             //Try to reconnect if the connect is not successful             if (mBluetoothLeService != null) {                 new CountDownTimer(3000,1000) {                     public void onTick(long millisUntilFinished) {}                     public void onFinish() {                         final boolean result = mBluetoothLeService.connect(mDeviceAddress);                         Log.d(TAG, "Connect request result=" + result);                     }                 }.start();             }                     }         return START_STICKY; } 

Answer 1

There are different parameters for connectGatt() method, it differs from API version. This is kotlin code. I don't see your connect method anywhere but i know you have to call connectGatt() somewhere.

Build.VERSION.SDK_INT >= Build.VERSION_CODES.M -> bluetoothDevice?.connectGatt(applicationContext, true, mGattCallback, BluetoothDevice.TRANSPORT_LE)  else -> bluetoothDevice?.connectGatt(applicationContext, false, mGattCallback)