The diagrams above may seem harmless enough. The temperature in a fridge in our house. Sent to ThingSpeak by a VSCP Daemon and received from a Kelvin temperature node. But the knee on the fridge temperature diagram show that I open the door to get my lunch. And this information can of course be used. If the door opens from time to time someone is home, if not… Other patterns can also be discovered. Better if data as often as possible stay as close to the user as possible.
Live data is here.