Indigo Domotics

I've read through the how-to and I can get the plug-in to work from Indigo, and I can set a button on the keypad to play/pause or I can have the button illuminate when a change of state happens, but I can't wrap my brain around how to do both.

For example, I'd like a button to light when itunes is playing - regardless how it happens (from AppleTV, remote.app, manually from itunes). When the button is lit, I'd like to be able to press it and stop the music.

When I tried this I set up the trigger to turn on the button and then an action for the keypad button to play/pause. I ended up with a loop. What am I missing?

I think you probably just got into a logic loop. If you think of it in discrete components, then you can break it down. So, first, let's get the buttons in sync with iTunes - these will work regardless of how it started/stopped playing:

1. Trigger when Device State Changed for your iTunes device when Player Status is Playing Becomes True - turn on the button(s)
2. Trigger when Device State Changed for your iTunes device when Player Status is Playing Becomes False - turn off the button(s)

So, with just this, you can play/pause iTunes all you want from any controller. Next, you want the KeypadLinc buttons to play/pause. For each button that does this:

1. Trigger when INSTEON Command Received for your KeypadLinc when On is received from the appropriate button number - start iTunes playing
2. Trigger when INSTEON Command Received for your KeypadLinc when Off is received from the appropriate button number - pause iTunes

Note that I'm using the INSTEON Command Received trigger - that's because if trigger on Device State Changed, then it's going to fire when your sync triggers above sync the button (when it's NOT initiated by the actual physical button press). Using this trigger guarantees that the only time the trigger will fire is when the actual button is pressed. This may have been the source of your infinite loop.

Thanks! This is exactly what I was doing wrong.