I just received my Carloop in the mail a few days ago, and have attempted to test it on my 2010 Nissan Altima. I've been trying to have this available PID printer display what PIDs my Altima has, but to no avail. No PIDs are found and outputted through Serial, and I'm sure I've plugged it in correctly. The printer code was from this tutorial linked via the Carloop website. What could I be doing wrong/how can I fix this? Thank you!