The comma serial gets you access to a low level serial console on your comma three, while providing a stable 12V to power the device.
The serial is available on the comma shop.
Connect all three cables to the serial
Connect the USB A to your computer
Connect the USB-C to the OBD-C port on your comma three
sudo screen /dev/ttyUSB0 115200
connect.sh to run the previous command in a loop.
The username and password are both