There is the generic problem to "detect" the device. See the detect_board() function in: https://github.com/MicroPythonOS/MicroPythonOS/blob/main/internal_filesystem/lib/mpos/main.py

One option is to look at the MAC address. But it is probably not reliable. So let's collect them here to see what we have...

To get it via mpremote run this:

--> import machine
--> ':'.join(f'{b:02X}' for b in machine.unique_id()[0:3])
'AA:BB:CC'