如何解决错误 onClientConnectionState() - status=22 clientIf=7 in BLE答案

【问题标题】：How to solve the error onClientConnectionState() - status=22 clientIf=7 in BLE如何解决错误 onClientConnectionState() - status=22 clientIf=7 in BLE
【发布时间】：2021-10-06 17:18:45
【问题描述】：

我有一个 Android 应用程序，它使用 蓝牙低功耗 (BLE) 与我的手机连接。该应用程序在几乎所有手机上运行良好，例如 Galaxy S5 (Android 5.0.1)、Galaxy S6 (Android 6.0)。但是，它在 Galaxy Note 3 (Android 5.0.1) 中存在严重问题。

当我调用connect()函数，然后调用readCharacteristic()，它返回错误：

onClientConnectionState() - status=22 clientIf=7

在我调用connect 函数大约 2 秒后发生错误。我查了一些解决方法，比如在调用 readCharacteristic()之前做一个延迟，但是不能解决。

您有什么办法可以解决我的问题吗？

谢谢大家。

这是我的代码：

 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);
 }

这是我连接BLE的完整服务功能文件

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;
}

【问题讨论】：

你是从 UI 线程还是工作线程调用 connect() 方法？
我在服务中调用连接函数。它适用于几乎所有设备，除了某些设备，例如 Note 3
如果可能的话，你能发布服务类的代码吗？
是的。等我。我现在就去
@PravinD：让我们看看我的更新。类BluetoothLeService.java来自google示例代码

标签： android bluetooth bluetooth-lowenergy android-5.0-lollipop

【解决方案1】：

connectGatt() 方法有不同的参数，它与 API 版本不同。这是科特林代码。我在任何地方都看不到您的连接方法，但我知道您必须在某处调用 connectGatt()。

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

else -> bluetoothDevice?.connectGatt(applicationContext, false, mGattCallback)

【讨论】：