I think the OBDII port's can wires on VAG cars is connected to the gateway, which probably wants to see some sort of diagnostic commands. Try tapping into one of the main can wires.
And I agree, the device is pretty cool, but you're basically on your own after purchasing. Wish they got BT LE functional before abandoning support.
I'm having some trouble capturing the data via WireShark. I followed the instructions as noted (except using /dev/cu.usbmodem1411 instead of 1421), and wireshark seems to connect (node does say "Client connected to /tmp/cbtbus1"). But it doesn't capture any packets.
If I connect with coolterm, I definitely get CAN packets. I do have JSON disabled. Not sure what to check at this point