Reply To: Mayfly sketch compiles, seems to upload, but doesn’t

@tahicksonstthomas-edu  – like as you say thats interesting, all of investigations start with that.

Probably post the code – though it looks like it is structured to not compile –  eyeball the code flow from first call to setup() and subsequent calls to main() and is your section of the code isolated.

SC typically shows colour coded syntax – though .ino as a code anomaly require special enabling. IMHO the easy way is to change the .ino to .cpp