On Thu, Oct 9, 2014 at 8:57 AM, Ray Bellis <Ray.Bellis@xxxxxxxxxxxxxx> wrote: > > On 7 Oct 2014, at 19:38, Phillip Hallam-Baker <phill@xxxxxxxxxxxxxxx> wrote: > > Right now I have a house with three Internet thermostats and six smoke > alarms, all of which have temperature sensors and occupancy sensors. > It would seem like a no brainer to connect these up in an intelligent > way so that lights get switched off when there is nobody in a room and > using the temperature in the rooms that are occupied to set the > furnace temperature rather than the ones that are not. > > > With the key part being that all this should work exactly the same even when > the household 'net connection is offline. Precisely. We had a storm come through and take out the electricity line and almost took the primary Internet as well. Out here they supply electricity from telephone poles! So when a tree brings down a line there is live 240V supply. It would of course be a bad thing if taking out the Internet shut the house down.