Re: security by ping
*You* said security by ping not me. I didn't say I was using it as a security measure. My experience of CCTV is that it's not a deterrent, and it's never of any use to the police in getting any stolen property back - let alone catching the scrotes.
I just happen to have a CCTV camera hooked up to my server so I can play around with Zoneminder. I did toy with the idea of sending an email or SMS when the phone was out of ping range, but it was easier to issue a "service zoneminder start" command, than trawl through the sendmail or bluetooth manuals.
Yes, my Smartphone has a fixed IP - or rather my router gives it a fixed IP. And regarding any power saving mode (which it does have) that's kind of a failsafe anyway. There's no downside to the camera being activated erroneously, so it's a risk I'm managing to live with.
It irritates me when people fail to account for all factors before picking fault. As a 100% reliable presence detector, is this suitable ? No. As something cobbled together with what was lying around to illustrate how we can always find new tricks for old dogs is it of interest ? Yes.