RF sensors into Home Assistant

Point --ha-broker at the MQTT broker Home Assistant already uses and every transmitter the decoders can name becomes a device there, through MQTT discovery. A weather station’s temperature and humidity, a meter’s reading, a tyre sensor’s pressure, and the level each was heard at.

The point is that none of it needs the vendor’s hub. A sensor you already own, transmitting in clear on 433 or 868 MHz, becomes a Home Assistant entity because something listened to it, not because a bridge was bought and an account was made.

--ha-spaces ism,wmbus keeps it to your own sensors and meters, which is almost always what you want. Leave it open on a band full of handsets and the house fills up with devices that rotate their address every quarter of an hour, so the default is the narrow one.

There is a call bus and a message bus as well, with an on-air lamp, so an automation can react to a channel going busy or to a page arriving.

$ waveshark --tune 868.3 --headless \
    --ha-broker homeassistant.local --ha-spaces ism,wmbus

A warning worth repeating

Publishing everything heard is a bad idea on a busy band. Device identities are a record of who was where, and a phone or a tag that passes your window every morning is a person. Keeping it to ism,wmbus keeps it to your own house.