viessmann-optolink2mqtt 0.2.1

Open source interface between a Viessmann device (heat pump, gas heater, etc) and MQTT

viessmann-optolink2mqtt

Open source interface between a Viessmann device (heat pump, gas heater, etc) and MQTT.

Architecture

Hardware

• A Single Board Computer (SBC) which is capable of running Python and has a USB-A connector (if you plan to use the original Viessmann Optolink USB cable). A typical choice is the Raspberry; myself I've been using the OLinuXino A64 as (slightly cheaper) alternative.
• The Optolink USB cable to read/write; you have two main options: a) buy the original Viessmann cable on specialized shops such as https://www.loebbeshop.de/; see exact item here or b) build your own cable, more details available from other tinkerers like MyVitotronicLogger or at Optolink splitter readme

Installation

This project supports 2 main installation methods: PyPi and Docker. Both methods are meant to be used from a Linux Operating system which has the USB/DIY cable attached (see "Hardware" section above).

Pypi package

python3 -m venv optolink2mqtt-venv
source optolink2mqtt-venv/bin/activate
pip install viessmann-optolink2mqtt

optolink2mqtt --help

Docker

When using Docker you will need to provide the YAML config file path in the docker run command and also provide the name of the serial port (e.g. /dev/ttyUSB0 in the following example):

docker run -d -v <your config file>:/etc/optolink2mqtt/optolink2mqtt.yaml \
    --device=/dev/ttyUSB0 \
    --hostname $(hostname) \
    --name optolink2mqtt \
    ghcr.io/f18m/optolink2mqtt:latest

docker logs -f optolink2mqtt

The docker image of optolink2mqtt supports 3 main architectures: amd64, armv7 and arm64.

Configuration file

This software accepts a declarative configuration in YAML format. Please look at the optolink2mqtt.yaml file as reference source for the syntax.

How to discover register addresses

TO BE WRITTEN

HomeAssistant Integration

This project allows a very easy integration with HomeAssistant. It's enough to populae the ha_discovery section of each register defined in the configuration file with some metadata specific for each sensor, to get the sensor automatically appear inside your HomeAssistant:

Related projects

• Optolink Splitter: this is the original project that inspired this one
• Optolink Bridge: inspired from the "Optolink Splitter"; requires you to own a VitoConnect device and allows you to setup a "man in the middle" device
• openv vcontrold: seems abandoned but contains a C-based implementation of the VS1 and VS2 protocols apparently. Its wiki has plenty of details although in German
• VitoWiFi: a C++ implementation of VS1 (KW) and VS2 (P300) Optolink protocols, for use on ESP microcontrollers but also Linux systems