I have a 4 way switch setup in my garage. I installed the HS210 in place of the first 3-way switch. It works great. I have a s24 phone and the light turns on immediately from the widget. The light will not turn off unless I would press ON again for some reason. I am assuming it's because I only have 1 HS210 in my setup. So I figured out a workaround. I created a "scene" in the app that just turns the light ON. Then I use the 1x1 scene widget. Technically it's like I'm turning the light ON only but it works for this setup.

I noticed other threads that had the same issue and just wanted to post my experience hoping it helps someone. Unfortunately the other threads wouldn't allow me to post a message. The correct way may be to have a second hs210 but there's no need for me and this works fine. Hope it helps someone else.