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this post was submitted on 13 Jan 2024
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Several of my smartplugs let me know if they stop receiving power. The notification arrives on my phone, so even if i'm out i know there's no electricity to the house. my parents often go away from home for weeks at a time and we use one on their freezer in case anything goes wrong.
How is the notification sent if there's no power to the house? Presumably no internet service then either. Or is it sent by a remote service that loses contact with your home socket?
My guess: the smart plug pings a remote server every minute or whatever. If the home server stops getting pings, it sends a notification.
Could have a dying gasp capacitor which allows the unit enough time to send the message before turning off.
Doubtful because that's a lot of work and expense to implement and useless if the router and modem don't have power.
I could see such a feature if the device was designed to work over cell networks since it's not dependent on other user hardware.
Surely something to look into. Thank you.