Reader software for the Wiener Netze smart meter based on https://gist.github.com/pocki80/941fa090a8d6269a9b3b68c195f8750f
I used this software on a Raspberry Pi with Loxberry installed (for Loxone Smart Home system) and a local MQTT broker.
As hardware I use a RS485 OP-400 optical probe from German Metering and a In-Circuit USB-RS485 converter. The probe is powered via 5V from the Raspberry Pi. The connection is ~30m to my basement where the smart meter is installed. This is the reason why I used a RS485 probe instead of a normal UART/TTL/USB probe.
Important: You need to align the optical probe so that the cable faces downwards, else the IR reader/writer is not aligned correctly, and you will get bogus results on the tty.
This is a very brief guide, modify it to your needs.
Clone the repository to your system. On the Loxberry this needs to go into
/opt/loxberry/webfrontend/legacy/wn_meter_reader to prevent deletion on updates.
First modify the config.py for your needs, particularly check the serial device file and fill in the MQTT credentials, as well as your AES key from Wiener Netze.
Use the ls /dev/serial-by-id/ to find the correct device file. You may need to add your user to the dialout group to run this application as non-root user, e.g. by sudo adduser loxberry dialout.
nano config.py
Install the dependencies
sudo pip install -r requirements.txtCreate a systemd service
nano /etc/systemd/system/readmeter.service
[Unit]
Description=Service for reading the smart meter
After=syslog.target network.target
[Service]
Type=simple
ExecStart=/usr/bin/python3 /opt/loxberry/webfrontend/legacy/wn_meter_reader/readmeter.py
User=loxberry
LimitMEMLOCK=33554432
Restart=always
RuntimeMaxSec=604800
[Install]
WantedBy=multi-user.targetEnable the service
sudo systemctl daemon-reload
sudo systemctl start readmeter.service
sudo systemctl enable readmeter.service
sudo systemctl status readmeter.service