Bluetooth application works fine on Android 5 api22 but not on Android 6 api 23

Ajay Krishna

Hi All,
I have developed a Bluetooth application on Qt5.5.10 , in Android 5 api 22 and everything worked fine.
Now I'm trying to test it on Android 6 api 23,i am able to discover nearby devices but I'm not able to connect to external Bluetooth device.
This is what I made:

In project build settings, Android build APK set to Android-23
In AndroidManifest.xml, Minimum required SDK API 21
In AndroidManifest.xml, Target SDK API 23
In AndroidManifest.xml, android.permission.ACCESS_COARSE_LOCATION
In AndroidManifest.xml, android.permission.ACCESS_FINE_LOCATION
In AndroidManifest.xml, android.permission.BLUETOOTH
In AndroidManifest.xml, android.permission.BLUETOOTH_ADMIN

bluetoothSocket = new QBluetoothSocket(QBluetoothServiceInfo::RfcommProtocol);

bluetoothSocket->connectToService(QBluetoothAddress(string),QBluetoothUuid(QBluetoothUuid::SerialPort),QIODevice::ReadWrite);

I am getting following result :

D libBlueTooth.so: (null):0 ((null)): qt.bluetooth.android: Connnecting via secure rfcomm
D libBlueTooth.so: (null):0 ((null)): QBluetoothLocalDevice::Pairing(Paired)
D libBlueTooth.so: (null):0 ((null)): void MyBlueTooth::devicePairing() Local device Paring
10-29 11:39:00.925 3026 3082 D libBlueTooth.so:
D libBlueTooth.so: (null):0 ((null)): qt.bluetooth.android: Connecting socket
W BluetoothAdapter: getBluetoothService() called with no BluetoothManagerCallback
D libBlueTooth.so: (null):0 ((null)): qt.bluetooth.android: "LocalDeviceBroadcastReceiver::onReceive() - event: android.bluetooth.device.action.ACL_CONNECTED"
W System.err: java.io.IOException: read failed, socket might closed or timeout, read ret: -1
W System.err: at android.bluetooth.BluetoothSocket.readAll(BluetoothSocket.java:745)
W System.err: at android.bluetooth.BluetoothSocket.readInt(BluetoothSocket.java:757)
W System.err: at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:379)
W libBlueTooth.so: (null):0 ((null)): qt.bluetooth.android: Falling back to reverse uuid workaround.
D libBlueTooth.so: (null):0 ((null)): void MyBlueTooth::function3(QBluetoothSocket::SocketError) QBluetoothSocket::ServiceNotFoundError
10-29 11:39:02.452 3026 3082 D libBlueTooth.so:
W libBlueTooth.so: (null):0 ((null)): qt.bluetooth.android: Workaround failed
D libBlueTooth.so: (null):0 ((null)): qt.bluetooth.android: "LocalDeviceBroadcastReceiver::onReceive() - event: android.bluetooth.device.action.ACL_DISCONNECTED"

Can someone say me where i go wrong ?
Thanks in advance.

koahnig

@Ajay-Krishna

Hi and welcome to devnet forum

More out of gut feeling than knowledge I am assuming that something might have changed on the Android side.

Possibly it is better to check also in Android groups e.g. android-qt or others for an answer on this. However, android-qt has slowed down significantly over time.