Add support for BlueDroid bluetooth stack on Android

Establishing connection between an Android 4.2.2 device and a usb SPP device fails - services are discovered right, connect starts and goes with
I/BluetoothSocket_MTK(14968): [JSR82] Bluetooth Socket Constructor
I/BluetoothSocket_MTK(14968): [JSR82] type=1 fd=-1 auth=true encrypt=true port=-1
I/BluetoothSocket_MTK(14968): [JSR82] connect: do SDP
I/BluetoothSocket_MTK(14968): [JSR82] SdpHelper::onRfcommChannelFound: channel=1
I/BluetoothSocket_MTK(14968): [JSR82] connect: do SDP done; mPort=1

and then (maybe due to fd=-1) it says from socket error slot:

"Connection to service failed" QBluetoothSocket::ServiceNotFoundError.

Is there actually a support for bluedroid or it is unsupported for now?