I am not sure what to put in the TNC Port window on Xastir if I'm using a Mobilinkd TNC2. Xastir has directions for just this however, it is for Ubuntu Linux. https://xastir.org/index.php/HowTo:BluetoothTNC I'm on Mac OSX 10.15.5 and rfcomm doesn't exist.
I think I need to bind the bluetooth device/port to another port to keep it open. I may be making stuff up though.
I have tried entering the ports from /dev/* that are related to the device (ie. tty.MobilinkdTNC2-DevB) but it still fails.