I know this doesn't answer your question. But since no one appears to have an answer for your question, thought I share a little insight base on my personal past experience.? In general, I avoid doing IP control for any consumer product, at least for anything mission critical, because of reliability issues.? Virtually ever job I have done using IP control on TVs and receivers, I have had to eventually go back on convert it to some other method because IP control was intermittent or a firmware update broke it.? A commercial product is a different story -- IP control is generally robust.?
I just did a Yamaha RX-A3080 and what I did was control it will IR.? There is a 3.5mm jack on the back of the RX-A3080 so you don't have to put a flasher on the front of the unit.? IR will always work because the manufacturer is very careful not to break that interface during firmware updates.? If I need feedback, such as volume level in my case, I do an RS232 connection to the receiver.? The RX-A3080 has RS232 port on the back of it.? I only use RS232 for feedback as if that breaks, and I have seen that happen after a firmware update, at least the receiver will turn on, switch inputs, and the volume control will still work.? The only thing that happens is the volume level may not display on any two-way interfaces.? But at least the system is still usable.
If you want to use IP control, you will probably have to write your own module. At least that is what I have had to do in the past. If the issue is with the firmware in the receiver, even that won't work.