@scrouchman 

I too have a pair of HS100 that have apparently just updated to 1.1 from 1.03. I was using them with HomeAssistant but now although the Kasa app can see them, they do not respond to HomeAssistant trying to connect to them. The app is too simplistic to be able to turn lights on at dusk, and off at dawn.

Hopefully TP-Link can fix the communication problem that has been introduced in 1.1.

I have a few HS110's that have recently upgraded to Firmware 1.1 and now they are not working on HomeAssistant either.  It's very annoying, I'll be moving away from these sockets and using one that supports open standards so these issues won't occur in the future.

@robbo. 

Has affected all my plugs as well :(
As a workaround have another pi telling Alexa to turn the plugs on via Festival Text to Speach. I have a few things setup like to turn the plug off to the telly and things when my work computer is on and turn the light on when it gets dark.

Hopefully they fix it soon.

So it is home assistant I am using however I do want to stress it does not work in the kasa ios app either. All I can assume is the latest firmware has broken the device api (probably discovery) so it doesn't work from home assistant or the kasa app

My iphone app works still, but I allocated the plugs fixed ip addresses when I set them up, which was supposed to stop them getting lost by Homeassistant. It seems TP-Link found a way round that...

@ntsmkfob I have static ips as well.

I've just tested this again and for me once I factory reset the plug and set it up the app works that one time, can turn it on/off view stats etc. But if I force quit the app it then won't work again.

I do have remote control disabled as I don't need it, do you have that enabled? Maybe its working for you because its doing it via the cloud rather than the local network

Am wondering if the firmware is downloaded to the app then to the plugs, if factory resetting the plugs restores the previous working version as long as the app isnt used it might get things working again, but then, will need the app to join the plug to the network and will probably do the update/break it so will waste more time.

Flipping annoying. Having local control was the reason I chose these plugs. :(
 

@scrouchman 

I  never used the app after initial setup a few months ago until they failed yesterday. I have always used the HomeAssistant integration. I surmise that TP-Link can access the plugs directly to force the update.

Likewise, my HS100s have lost their HomeAssistant integration. That was the only reason I had them. Without the integration, the plugs are useless to me. 
 

TP-link, please advice how to downgrade back to the previous firmware (and not have it auto-update again), or provide a fix for this issue. HomeAssistant integration is vital for the so-called "world's no.1 provider of WLAN products".