Bluetooth RFCOMM on Jetson Nano

I have manged to enable RFCOMM by following:

My goal is to send commands via and android app such as BT Terminal to the Nano running a python client such as:

To this point, I can pair the android device and rfcomm does exist, when I attempt to connect via android (I have tried multiple apps) I always get error 507, Unable to connect is device turned on.

So far, I can’t find the missing piece - there are lots of RaspberryPi discussions I have looked at, so far nothing helps with my message.

Ideas appreciated!