Older russound (rs232) control support

[672southmain]

@Pantheon

to allow text commands (RIO) to be sent to the Russound via TCP/IP.

@Bullfrog, I believe this could be modified to do what you want. At least it would give you a framework to use as a starting point.

[RELEASE] HTD MCA66 Multizone Amp

Hello - Here's my first attempt at a Hubitat driver. I wrote one to control my HTD MCA66 Multi-zone amplifier. Check it out and let me know what you think: https://github.com/jmehlman/hubitat-htd-mca66-driver