@aaronpk Dude! I think you are spot-on there. Analog is good. It's how some telephone landlines STILL work all these years later. More analog is more better. Embedded OS if you have to (QNX, WindRiver, etc.) but not that bloated, un-updateable vers. of Unix. Not for an IoT device.
@aaronpk Hmmm. It makes me wonder whether a building could be set up with long-lived analog systems that work by themselves but that also offer easily accessed wire terminals for whatever else the occupant wants to hack in.