making the HS210 work in a multi-way; multi-fixture setup
Have 4 switch locatoins controlling 4 connected light fixtures in a hallway. Tried connecting with TP-Link/Customer tech support to figure out whether HS210 would
support this. I had previously succeeded at simple use of HS210 on a two switch setup, even though I only replaced one of the switches with an HS210. Tech support said I'd either need 2 HS210's to have any chance or getting it to work, or it probably wasn't supported anyway. SURPRISE! It can be done, and it works, and it only requires 1 HS210.
The trick is to not put the HS210 on a 4-way switch, but to replace an end of the circuit 3-way switch with the HS210, and leave all the other (old) switches in place. Works like you'd want - with app on phone, or through Alexo/Echo. Now if only the scheduling function worked as designed.... sunset function all over the place, and shutoff time ignored (yes, I've tried resetting time zone). And KASA insists on being parental by forcing us very rural folks to only use password protected wifi, and only 2.4 hgz.... Oh well, one problem per day, I guess.