我正在开发一个Android应用程序，该应用程序同时连接到多个BLE设备，之后我从这些设备永久读取特征，但过了一段时间，我在onConnectionStateChanged（）函数中获得状态257，Android文档没有解释错误的原因或如何修复它。

public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
            Log.i("TAG","onConnectionStateChange, status : "+status+" parseConnection : "+ GattStatusParse.parseConnection(status)+"  or "+ GattStatusParse.parseConnection(status));
            isConnected = BluetoothProfile.STATE_CONNECTED == newState;
            if (status == BluetoothGatt.GATT_SUCCESS) {
                   if (isConnected) {
                    Log.i(TAG, "GATT connected." + connectedBluethoothDevice.toString());

                    gatt.discoverServices();
              } else {
                     Log.i("TAG"," GATT disconnected " + device.getAddress() + " state of the opération : " + status + " connexion state : " + newState);
                    if (connectedBluethoothDevice.contains(device)) {
                        connectedBluethoothDevice.remove(device);
                    }
             }else{
                if (connectedBluethoothDevice.contains(device)) {                     
                    int mConnectionState = mBluetoothManager.getConnectionState(device, BluetoothProfile.GATT);
                    if(mConnectionState==BluetoothProfile.STATE_DISCONNECTED || mConnectionState==BluetoothProfile.STATE_DISCONNECTING){
                        connectedBluethoothDevice.remove(device);
                    }
                }
            }
    }

有人能帮我解决这个问题吗，谢谢。