I have the same issue, and I noticed that I got a loads of errors with something related to a file when i was extracting logs for another issue I am in contact with support about.
Now that the new Firmware for my issue is out. I will install this and extract the logs again and probable post it here and then make a support ticket for it.
I tried doing obd.dump from the terminal but im getting transmit buffer full error. Do I need to clear out some buffer file?
This happens when the engine is on but works only if it is off.
I have exactly the same issue as @alexu. If I try to send a raw can message with any protocol other than protocol=6, it fails “CAN sending or receiving failed” and an exception in elm327.py. I’m wondering why its reporting an elm327 error as I tried protocol=31 which should use stn11xxx.
My send command looks like this:
obd.send 03222B29AAAAAAAA header=713 expect_response=True auto_format=False protocol=31
Sending standard OBD requests works fine. Any clues whats wrong?
What car do you have?
I am starting to believe that some cars cannot use this feature 
As in, my Mercedes 2015 B180, I cannot do any recording at all. Even tho it seems to detect the correct baud and other details.