3 ms·

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

• cbsmith 7y ago
  It could be, but it is probably just they have enough backup power to send the signal.
  • judge2020 7y ago
    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 7y ago
      In this case, no.
• halbritt 7y ago
  The device itself is a Nest Protect fire alarm connected to 120VAC. It has a built in battery back up.