People occasionally forget to lock the door before leaving the house, or leave a stove on by accident, or any number of other things.
“Internet of Things” aficionados often suggest that you could, say, turn on and off your stove from your phone, but now someone on the Internet thousands of miles away can also turn on your stove at a random time.
If your appliances could report their status wirelessly to a receiver on your door, then you could check your home’s status as you leave.
Anything that is amiss will glow in an obvious fashion that calls for more investigation (see mockup in Figure 1).
Since this is a one-way channel of communication, you don’t have to worry about hackers turning on your microwave. (Additionally, high security is not crucial here; exposing the information “your microwave is on” to a hacker 8000 miles away is probably not a realistic concern unless you’re making a contrived scenario for a made-for-TV movie.)
PROS: As with all Internet-of-Things things, it solves a problem that actually does (juuuuust barely, anyway) exist, and (more importantly) provides a great hobby for engineers.
CONS: In five years, when your smart home hub supplier is out of business, none of your new appliances will work with your system. And when you buy a new dryer, you’ll have to research it for 80 hours to to see if it’s compatible with your version of the Smart Home hub, and then you’ll to have to dig around on the internet for a firmware update named SmartHouse_v_2.7_North_America_41.80.24b.dat.zip. Which will then turn out to be malware that turns your hub into a Dogecoin miner.