I have an Insteon 2466SW ToggleLinc Relay Insteon Remote Control On/Off Switch Non-Dimming in place and wanted to know how I can integrate this with my SmartThings app / hub. My SmartThings Hub is model STH-ETH-250. By the way, I’d like to integrate with out having to use the Insteon Hub if that’s possible
There is no direct integration between Insteon devices and SmartThings. Insteon uses its own proprietary protocol. So you will always need the Insteon Hub.
If you do have an Insteon hub, there is an indirect integration available through the Stringify service, but it can introduce some additional lag.