wmBus Meters And How To Get It Into Home Assistant

wmBus Meters And How To Get It Into Home Assistant

Recently, I decided to switch over to Home Assistant due to instability of iobroker. Maybe I had too many adapters, slaves or what else… Somehow it did not function properly anymore. Also the UI of Home Assistant and its performance is much better than iobroker in my opinion. So I gave it a try and most of my stuff was quickly integrated, especially the HomeMatic stuff with some Paspberry Pi 3 used as the CCU.

But one problem came up again… How to get my wmBus and M-Bus meter readings in. As I wrote in some previous post about wmBus, I could not find a software able to decode the Messhelden (manufacturer code AAA) heat cost allocators correctly outside of iobroker (the working software was: https://github.com/ISFH/ioBroker.wmbus). So I gave wmbusmeters a second try to publish the read values via MQTT.

After quite some work with updatigng my (really outdated) codebase, fixing stuff, integrating my two new meters, documenting, how to add a new meter and a help of the really active maintainer of wmbusmeters, I managed to get everything done. Take some Raspberry Pi, put the wmBus-Stick in place (I use IMST iM871A-USB) and move on with the software.

Just do the relevant steps: Cloning, building, installing, configuring enjoying:

pi@wmbuscollector:~ $ mkdir GIT
pi@wmbuscollector:~ $ cd GIT
pi@wmbuscollector:~ $ git clone https://github.com/weetmuts/wmbusmeters.git
pi@wmbuscollector:~ $ cd wmbusmeters
pi@wmbuscollector:~ $ ./configure
pi@wmbuscollector:~ $ make
pi@wmbuscollector:~ $ sudo make install

Configuration can bea easily done by editing the file /etc/wmbusmeters.conf:

# meterfilestimestamp=day
shell=HOME=/home/wmbusmeters/ /usr/bin/mosquitto_pub -h -u mqtt -P mypass -t wmbusmeters/$METER_ID -m "$METER_JSON"
json_address=Elfenstrasse 12

Now start wmbusmeters with the following command and watch it fetching packets:

pi@wmbuscollector:~ $ wmbusmeters --useconfig=/

Now you simply need to add meters that shall be collected and published on MQTT. This is done by placing a single file per meter in /etc/wmbusmeters.d


The keys is only needed, if your meter sends encrypted data and you should have received the key from your manufacturer/seller of the meter.

My meters‘ data now gets transferred via MQTT and my Home Assistant simply fetches it and puts it into is history store (sqlite & influxdb in my case). The appropriate YAML in Home Assistant looks like this:

 - platform: mqtt
   name: "HCA NBEG WS"
   unique_id: wmbus.60900128
   state_topic: "wmbusmeters/60900128"
   unit_of_measurement: "hca"
   value_template: "{{ value_json.current_consumption_hca }}"
   json_attributes_topic: "wmbusmeters/60900128" 

All attributes (other sensor values) simply get packed into the attributes of the new sensor.

Happy metering!


2 Kommentare

Get Your Personal Oil Well Level – Integrating OilFox Into Home Assistant using node-red – MolesBlog Veröffentlicht am18:58 - 23. November 2022

[…] flow measurement devices). To see, how I got the data from the heat cost allocators, have a look here, to get the data from the heat flow measument devices, look […]

Taking Your M-Bus To The Next Level… MQTT – MolesBlog Veröffentlicht am14:26 - 27. Oktober 2022

[…] BTW: To connect my wmBus meters, I used wmbusmeters from GitHub and also contributed my two Aventies meters (Cold Water Flow and Heat Cost Allocators). You can find the wmbus post here. […]

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