Smart Plug TP-Link Kasa HS300

Several possible reasons:

  • time - sometimes, I have seen it take a few hours for a Kasa smartplug to show up as Sense devices, while others show up not idea why. Have some patience.
  • network - Sense uses a subnet broadcast to identify and collect data from all smartplugs. If you have multiple access points in your house (mesh or wired) or multiple networks/subnets (i.e. main and guest), your network might not be forwarding the broadcast to all parts of your home. There might also be an issue if the WiFi signal to one or more of your smartplugs is weak.
  • firmware - if you are in the US, make sure you have the most up-to-date firmware via the Kasa app. If you are not in the US, then then the newest firmware might cause problems - Don’t update.

More on my second bullet.

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