Just FYI but TP-Link has been pushing out a firmware update to the devices that breaks the current method used to locally control them, in the name of security. They closed off port 9999 which is the port used to poll/control them. I do not know the exact extent or details yet. I first learned about it in the Hubitat forum. Some people are reporting that their firmware auto updated and others saying it didn’t. I have 3 HS110s and thankfully mine did not auto update. In the Kasa app, I can see that the version mine are running is 1.2.5 and the newest is 1.2.6.
It looks like TP-Link is currently offering to roll back the firmware for users that need it, but it seems to be something their tech support has to manually do so no telling how long they will allow this.
It also seems to not be affecting all hardware revisions or geographic locations, but I find it highly unlikely they would not push out the same update to all the various hardware revisions of the plug.