I have been reading this thread with interest. I have been using the Telnet connection and RIO commands with my Russound MCA-C5 for some time now, with variable, but mostly accurate success. I am using webcore on Hubitat with a Hubitat telnet driver. I also found that the C5 needs polling to stay alive. I poll every 30 minutes. I just query with GET C[1].Z[3].mute. My problem is missed/ignored commands. Setting the volume and source of a zone and turning it on with sequential commands WITHOUT a wait time in between commands gives mixed results. Most of the time, the volume command gets ignored. I noticed above that you are using 5 second waits. I was able to trim that down to around 850 ms, but even that is sometimes problematic. I really thought that the Russound SHOUD be able to accept commands faster than 1-2 seconds per command. If I am turning on music throughout my whole house, it can take upwards of 30 seconds to get music to all rooms AFTER the Alexa command to turn on music. The WAF for that is low.
