RTL_433 to MQTT with Acurite Weather Sensors and Itron Water Meter

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Single MQTT topic + Demuxing

In my first iteration of this, I had streamed all rtl_433 data to a single topic and used an automation to demultiplex them (aka: split them into their own MQTT topics) before realizing rtl_433 can do this natively. I’ve edited the post, but in case that’s useful for something, here’s how to accomplish the demux step:

With rtl_433 publishing to a single topic: mqtt://your_mqtt_server,retain=0,events=rtl_433/_raw

Create an automation:

- alias: RTL433 MQTT Demuxer
  description: Split rtl_433/_raw signals into individual topics
  trigger:
  - platform: mqtt
    topic: rtl_433/_raw
  action:
  - service: mqtt.publish
    data:
      payload: '{{trigger.payload}}'
      topic: rtl_433/{{trigger.payload_json.model or "UnknownModel"}}/{{trigger.payload_json.id
        or "UnknownId"}}{%- if trigger.payload_json.message_type -%}/msg{{trigger.payload_json.message_type}}{%-
        endif -%}
  mode: single

This takes any published mqtt message and re-publishes it at rtl_433/Model-Name/1234 (where 1234 is its id) – or if it contains message_type, then rtl_433/Model-Name/1234/msg56.

(this idea is based on Multi sensor using same MQTT topic - #3 by 123 but generic)

rtl_433 built-in demuxing

For reference, rtl_433 has placeholders when publishing, so it supports doing: mqtt://your_mqtt_server,retain=0,events=rtl_433[/model][/id] (see more info here).