Hm... Issue #2, with the unwanted display pausing with cancelling out of "RESET TRIP" or "REFILL TANK", is very likely a bug in my code, not the app.
I re-examined your code and realized that it should only change output states if the app transmits an "MM", not necesarly just an "M". Changed my code to do this too, and the issue went away.
Sorry about that
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