homeassistant

But if your phone doesn’t have great signal across the entire house a lightswitch inside of a metal box in the wall is going to be worse.

I hesitated expecting exactly this, but so far it’s worked flawlessly.

My house is older construction with very dense walls, and yes all the switch boxes are metal. When I enter my house, cell coverage drops to one bar and might goto zero as I walk around the house (thank goodness for WiFi assist). WiFi disappears as I go through certain doorways so I need a mesh and mesh routers about 10-15’ apart can’t communicate with each other. Back when cordless phones were a thing, they would only cover a room, although interestingly 900MHz was the best cordless phone frequency and higher frequencies had worse range. My house is horrible for radio signals.

But both Zigbee and zWave have worked really well. It probably helps that my first priority was smart switches, which are one or more repeaters in every room and more likelihood of straight lines through doorways, but it just works. Much better than WiFi.