@MoeG The switch at the line end simulates how most dimmer 3-way circuits that are used today. One switch controls the dimmer the other can only just turn the light on or off. The switch on the line...

@damonluvisi If you do note that you can only have 3 smart triggers so you can only do this with one dimmer. If you have two like me then you set the dummy switch to to toggle the other one. It works...

@echo954 There is a way that will work majority of the time(haven't tested when internet is down). You use smart actions in the app. Wire the HS220 dimmer to the light only and in the other switch...