I have a Raspberry Pi Zero W loaded with Direwolf as a TNC for an HT UV-5R.  I would like to use this Pi/Direwolf as a TNC which is much improved over an APRS cable due to the availability of the PTT GPIO and not needing to use VOX.  I can successfully get the setup working using KISS on Direwolf and connecting over Wifi when my phone and Pi are on the same wifi network.  I would like to do the same over Bluetooth if possible but when configuring Bluetooth SPP on the phone, it is not connecting correctly to the Pi.