We have an RTI domotica solution since before OpenHab etc.
The setup includes an RTI amplifier with 8 zones out and 8 sources in.
I want to phase out the RTI solution. For the audio, I would like to leverage Roon zone control and dump RTI. Unfortunately, there is no control channel over IP but there is a web interface to link sources to zones. In short: I need a solution with 4 Raspberry’s, an audiohat with 4 rca-out, and decent powersupply.