-## OBD-II Basics
-
-TODO diagram out a request, response and error response
-
-* store the request arb id, mode, pid, and payload locally
-* send a can message
-* get all new can messages passed to it
-* Check the incoming can message to see if it matches one of the standard ECU
- response IDs, or our arb ID + 0x8
-* if it matches, parse the diagnostic response and call the callback
-