Android Bluetooth socket tutorial for non-blocking communication

I am looking for a bluetooth sample code on Android to do non-blocking socket communication.

I found several examples, like the BluetoothChat or BluetoothSocket.java but none is non-blocking socket communication.

ps does non-blocking automatically mean that is has to be asynchronous? I think actually not - it is not the same, I assume I could do synchronous socket communication with a timeout. That's the kind of example I am looking for...

Thank you very much