By use the devices do you mean turn lights on/off, toggle virtual switches, etc? If so, then yes, I believe that I've been able to do this remotely. As I'm really only using iviri for its geofencing it would be great to have the option to turn off voice control and any other functions that might speed things up. I've let the app sit for over 5 mins to see if it would come back to life but no go.