I'm using ubuntu 18.04. I have connected two devices to serial ports.

to ttyACM0 through usb and

to rfcomm1 via bluetooth.

I have read write permissions for the both ports.

I wrote a python3 program to get the list of device names which are connected to serial ports. It gives following output.

1 ttyACM0
2 n/a

it shows only the name of the device connected through usb port.

but not the bluetooth serial device.

why is that? how to get the name of other devices?

I tried with "sudo" also.

and whats the meaning of "n/a" ?

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