That would at the very least integrate with an ISY994i and set state variables or basic one way status packets. I had come across posts on other forums by Sean regarding exactly this project, but I can't find anything to implement. I'd love to so something as simple as tell the ISY994i controller that the system is armed or disarmed. Beyond that, then what zone is faulted. I don't need two way communication, but if that were the next thing I'd want would be a way to arm or disarm the system based on ISY program states, but that's the lowest priority of functionality I'm searching for.
An example would be, I arm the system, and my decoder sends/sets the state variable that the system is armed. From that I can program the ISY to do some action such as make sure all the doors are locked.