Sounds like a perfect application for a Raspberry Pi...
Well, Bill, that's the direction I would like to go. I have the device in hand, but I have not yet had the chance to do any experimenting with it. Ultimately, a simple device like the raspberry pie (apologies for the improper terminology, but I am using dictation software) appears to be the perfect platform for what I'm doing, but I also admit that I am likely never to have sufficient time to do the programming required to create and maintain an appropriate interface.
So, I am waiting for someone else to do it in a reasonably turnkey manner, so I can log onto it and use it.
I know you are further along in your raspberry pie investigative efforts, so if in the process you become aware of some good software and devices, please feel free to share it..
To now, the biggest obstacle has been the availability (or more particularly, the lack thereof) of a good, reliable and affordable Internet connection in rural Gillespie County; until very recently, even cellular was unreliable, but AT&T has recently built a tower somewhere nearby, and I'm able to get a 3G signal while I'm there. This is still not, in my opinion, a proper answer, though, because the cost and complication of using 3G as a fixed Internet source.
Time Warner provides cable television and Internet service in town, and my most recent check suggests they may actually have cable Internet available at the log shack; frankly, though, I am still skeptical, and while Time Warner's website offers me an installation appointment based upon the address, I still believe they actually have service available there.
We go to spend some time there, I am going to make installation appointment, and if they can actually do it, I will set it up, and also shut down the dish network satellite television account.
It would be very comforting indeed to know I could monitor the property, control thermostat, things like that.