Sorry I missed this response, thanks for the tip about ihiji, looks interesting! > working out the protocols for those systems [...] It was a major royal pain.

Sorry I missed this response, thanks for the tip about ihiji, looks interesting! > working out the protocols for those systems [...] It was a major royal pain. I can only imagine; I wrote an Extron GlobalViewer client module for Crestron controllers back in the day. At least Extron was willing to share the protocol, but it was absolute junk and a nightmare to implement. These walled systems are used everywhere in universities, government and other places where the bill lands with the taxpayer. Not only for the equipment, but also for the specialized training required to learn their broken tools. Hopefully someone will build an innovative solution on commodity hardware like RPi...