@RudyH Ok, I don't have the solution, but I at least have more information. What I've found is that the HS210 determines the state of the switch by difference in load b/w the traveler wires. In long...

@Tony Tony wrote @KCSmartLife If you end up using only one HS210 the app will respond odd. If you add the second HS210 that should correct it. If you want to keep the one HS210 you need to make sure...

I am using one HS210 to control a 3 way light, leaving the other 3 way switch as is. I just installed a HS210 and it works correctly (both smart and dumb switches can turn the light on/off), but the...