Issues with HC-12 module

[cattledog]

@cosmicprankster

I'm frustrated because I feel there is no absolute way to check if they are actually functional or not... As I said, I can't seem to even communicate through the SET pin which is indicative that the module is fried...

Do you have a USB/TTL serial adaptor? Using a terminal program on the PC and the adaptor you should be able to communicate with the module in SET mode.