Device ID on trigger

I'm working on a plugin for an alarm system. It has several device types, one of which is a contact sensor. Those are added to Indigo and I'm getting back status changes that I expect.
I defined an event for the plugin that will fire any time a contact sensor opens. The idea is to replicate the typical alarm panel behavior that will chime when a door/window opens without having to create a trigger for every contact sensor. I have this setup right now to send a Pushover notification and that's working fine, and actually this works fine with a chime too. The thing with the Pushover notification is that it would be nice to know which device triggered the event. Is there a way to pass a little data along to the trigger, maybe device id? Or another way to accomplish this? I might be missing something obvious with firing the event from my plugin.

You can't pass it along with the trigger, but you could create a variable (call it "last_alarm_event") and write to it before you execute the trigger. Then your notification action could use the substitution syntax to include the contents of that variable in the pushover message.

Makes sense. I was wondering on that though if there might be an issue with with timing if two sensors opened at close to the same time. I suppose that the majority of the time they would be far enough apart that by the time the second sensor triggered the Pushover notification the first one would have already progressed far enough that it would have pulled the value from the variable to populate its notification. I'll run with that - thanks!