So...I've been trying and trying, and can't get this to work right. I got the hs210 kit, and by all reports, replacing the first switch in the 4way setup should work fine. But, it doesn't. It does connect to wifi.  First try from app turns lights on, shows on on the app.  Turn off on the app, nothing.  Turn off again on app, shows turned on on the app, lights off.  Double press needed from app every time. Operates fine from actual switch except for reporting to the app.  Also does not report state to the app when other switches are used. I verified the proper wiring at the 4 way and 3 way dumb switches. Allegedly people have gotten this to work without a companion smart switch, but I can't get it to work. I've deleted and reinstalled the app, made sure of no firmware updates, and I'm out of ideas.