Hi Josh, I think you can send REQ to other Mysensors devices, not directly to domoticz. I think it is possible to do a request to the gateway and the gateway makes a request to domoticz, but you need to implement this yourself. If you look in the Mysensors API youll find this at the requesting data ...

I've got a question,

With this setup, can you use a normal light switch and a rfxcom to switch? Or only the rfxcom?

Thanks for the tip, gonna buy these anyway.