Somebody please help me. I feel like I'm losing my mind trying to figure this out. I make a little step forward and it seems that I go in circles after that. I've tried Example #3 here Serial Input Basics - updated - Introductory Tutorials - Arduino Forum and it doesn't seem to help. I've done so many examples that I'm even more confused than before. I now know that I want to use serial1 to send data to the ESP-01 via Tx connected to Rx, but I can't seem to get the line written correctly. Ive even tried playing with the code from https://www.arduino.cc/en/Tutorial/MultiSerialMega. I want to be able to send a topic from the Mega to the Esp via tx/rx, then have the Esp take the Topic and change it to outTopic.