[halbritt]

I live in Oakland, CA. Internet is definitely more reliable than electricity. My smart home devices send me an email when there's a power outage.

[kevinschumacher]

Could that be coming from the smart home device manufacturer noticing the device was abruptly disconnected?

[halbritt]

The device itself is a Nest Protect fire alarm connected to 120VAC. It has a built in battery back up.

[cbsmith]

It could be, but it is probably just they have enough backup power to send the signal.

[judge2020]

It's more likely that the device sends a heartbeat every minute or so, either for notifications or just for this "device is offline" feature.

[halbritt]

In this case, no.