I know things like this have been asked before, but it really is a big thing.
I would need the Zipabox to ping a special device/IP-number like every five minutes. if there is no reply, it should change to every 15 seconds.
This would make my doorlock work like a charm.
OR, you could build another device to plugin, that makes the same. (But he softwaresolution would be much faster to implement)
When I use other apps in the cellphone to make the same things, it affects on the battery of the cellphone.