Thanks for suggesting the microphone option. Thinking about it though, these devices are much less scary if i do my tests with them running off the backup batteries.

Building regs call for mains powered smoke alarms interconnected by wireless with battery backup. Has anyone figured how to intercept the signalling between them? Their being mains powered makes them scary to experiment on.

This'll be my first mysensor project with domoticz. Hopefully not biting off more than I can chew.