I was able to integrate the Switches with smartthings, however, when Switches manually turn on/off, smartthings is not able recognized current status of Switch, therefore, it doesn’t perform any automation triggers set on Smartthings.
Note: I’m able to control Switches and perform automation triggers through smartthings app!
Unfortunately, that is just the way that integration currently works. The TP Link switches do not report their status to SmartThings when they are switched by hand. It’s up to TP link to change that, so you should write to their support and let them know that you would like to see that feature.
See the existing discussion thread for more details: