In my experience, Bluetooth audio devices have been the most stable. SPP (serial port) on the other hand has never worked reliably for me. I mean, I have seen

In my experience, Bluetooth audio devices have been the most stable. SPP (serial port) on the other hand has never worked reliably for me. I mean, I have seen it work. I just never take it as granted that it will work, and thus far have not been disappointed.