Every Matter-ready smart home has one or more Matter controllers. Essentially, a controller is a hub that manages pairing, automation, and communication, including remote access via the internet. It ...
The SSR controls a 120V lamp in a flat-lensed fixture in my entryway, mounted vertically near the ceiling. Quite unobtrusive when off. Used a red bulb. If the garage door is open, the red lamp is on.