My experience connecting Landis-GYR to Openhab via SHRDZM

[wjones]

Hi All,

Working closely with Erich from Shrdzm, we have successfully managed to integrate with my new smartmeter in Switzerland.
As there were a few issues during this process, I have detailed them below.

My setup:

• Electricity Supplier : Romande Energie (R/E) https://www.romande-energie.ch/electric ... telligents

• Meter : Landis Gyr e450

• Connectivity: RJ12 port using M-Bus (DLMS/COSEM)

• Home automation system : Openhab 4.2 (latest version)

• System : Raspberry Pi 4

• Connection: MQTT (Mosquitto installed on RPI)

• Shrdzm device: https://cms.shrdzm.com/produkt/smartmeter-modul/

The RJ12 data stream from the smartmeter is not encrypted with R/E, so this makes the setup simpler.

Settings in SHRDZM:

• Baud: 2400

• RequestPin: OFF

• Cipherkey: Must be 32 digits, but not used - I used 000...001

• rxpin: 3

• invertrx: NO

• sendRawData: YES

• autoReboot: 0

Cable:
The RJ12 cable provided by SHRDZM (which is 6P6C) :

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This cable does not work for me - I tried different cables (with the same configuration).
Sometimes I got 3-4 packets of good data, then just invalid data.

After lots of headscratching and troubleshooting, I started to try other cables.
Finally, I discovered the following cable which does work:

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     X
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This is a 2 core RJ11 crossover cable (6P2C) used for ADSL / fax machines. I found this in my old box of cables, they are not easy to find online.
This cable worked immediately - No config changes needed in settings (e.g. I was expecting RX pin to change)

Once I had the above, I was able to see the data coming into SHRDZM in the last measurement window.

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(0)timestamp=2024-10-20T19:51:25
(1)1.7.0=568
(2)2.7.0=0
(3)1.8.0=5853648
(4)2.8.0=15317
(5)31.7.0=1.37
(6)51.7.0=0.57
(7)71.7.0=1.57
(8)32.7.0=238
(9)52.7.0=237
(10)72.7.0=237
(11)16.7.0=568
(12)uptime=0000:00:16:00

Then it's time to send the data to Openhab via MQTT.

Gateway settings IN SHRDZM:

• MQTT Enable: Yes

• MQTT Broker: IP of my RPI box

• MQTT Port: 1883

• MQTT ClientID: SHRDZM

• MQTT User: Not used (see Mosquitto.conf below)

• MQTT Password: Not used (see Mosquitto.conf below)

• MQTT Gateway topic: SHRDZM/Suisse

• MQTT State topic: SHRDZM/Suisse/Suisse

• MQTT Sensor topic: SHRDZM/Suisse/Suisse/sensor

• Send Values in JSON: Yes

• Modbus-TCP enabled : No

Mosquitto.conf
Mosquitto is installed on my RPI, I will not explain how to install this - You can find easily with google.
In my installation it is under /etc/mosquitto/mosquitto.conf (may be different for you)

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# Place your local configuration in /etc/mosquitto/conf.d/
#
# A full description of the configuration file is at
# /usr/share/doc/mosquitto/examples/mosquitto.conf.example

pid_file /run/mosquitto/mosquitto.pid

persistence true
persistence_location /var/lib/mosquitto/

log_dest file /var/log/mosquitto/mosquitto.log

include_dir /etc/mosquitto/conf.d
listener 1883
allow_anonymous true

Openhab:
Need to install following:

• MQTT binding

• JINJA-Transformations

• JSONPath-Transformations

This gives the Homeassistant MQTT binding https://www.openhab.org/addons/bindings ... assistant/ which is supported by SHRDZM.

You have to configure the MQTT broker "thing" in openhab:

• Broker hostname/IP : As MQTT is on the same RPI as openhab, the IP is the same as the RPI (and the same as what is configured in SHRDZM gateway)

• Broker port: 1883 (same as in mosquitto.conf)

• Enable discovery: Yes (may need to view advanced)

After this, openhab auto-discovered 1 "thing" which I had to add.
Inside that thing there are 13 channels, each one representing one of the data points from the smartmeter.

Hope this helps someone to set up their system, I guess the steps are similar for HomeAssistant too.

Cheers
Will