Thanks DCB and Magister.
I think I see where things are right now. The ISO interface sounds very simple to do, even though it takes a hit on the communication speed. I think I will try that to get the ball rolling on my project.
On a different subject, the current build of OBDuino (1.27) does not compile in the current Arduino environment (1.15). The compile finds conflicts with the serialBegin(), serialWrite() and serialRead() functions. Version 1.14 of Arduino compiles ok (HardwareSerial.cpp was changed between 1.14 and 1.15).
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