This is all very helpful – thank you!
I just updated TinyGSM via pio:
30f09b2..5efcc5a master -> origin/master
and re-tested (still in Transparent). No joy…and then Skype disconnected me from Jake’s computer, where the Mayfly is… not the ideal way to troubleshoot embedded systems…
So once he gets back to his office and I can reconnect, I’ll continue to troubleshoot as you suggested and report back.