Short version.
I have a brass door bell. It’s designed to be hard wired, but at the moment a push presses down on a cheap wireless doorbell, which rings as it should. As a door bell it works fine.
What I would like to do is have this connected to a zigbee button or similar, and pressing the brass button triggers it. Soemthing like a xiaomi smart button that accepts an external connection. Does such a thing exist?
There’s no power at the button so it needs to run on a battery with quite long life. No issues with weather.
If not I have a spare xiaomi button, I’ll try and do the same thing with it (or pull it apart!) but though I would ask the collective mind first.