Updated:
https://create.arduino.cc/editor/tfabris/4c5eea9a-1462-45d7-908d-81a5bb6b0d90/preview

- Now needs both TX and RX serial buffers for Arduino increased.
- Amount of increase is now only 128 instead of 256 because I had other weird problems at 256.
- Experimental reject responses to messages I don't want registered (though I couldn't test this much because the issue stopped happening on my system so I don't have a repro any more).
- Other small tweaks.
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Tony Fabris