On APRSDroid I get this error message:
Could not connect to PiZero! Please turn on the device and close other Bluetooth connections.
It seems my issue it getting the phone paired with the Pi. Here are some other settings details.
Connection Type = Bluetooth SPP
TNC Bluetooth Deivce = select PiZero which was piared from phone side
Bluetooth Channel = leave blank
Samsung Galaxy S9
Bluetooth set to discoverable
scan on -> I can see my device MAC address with only label of RSSI:
typing connect [MAC addr] -> Device [MAC addr] not available
I also tried modifying these 2 lines in dbus-org.bluez.service
ExecStartPost=/usr/bin/sdptool add SP