I apologize for what is probably a fairly simple solution, but I can code about as well as a penguin can play spades.
I’ve created the smart app and the device handler based on the original post. I’ve been able to see the app addition of the main and 4 zones in my ST app. I set it up using the IP address for my RX-V581 which is my main receiver. All of my other zones (6 more in total) are all using the WXA-50 amps.
After that set up, I am able to issue commands through the ST app but it doesn’t seem to be communicating with my receiver. Is there something basic that I’m missing here?