🔥 OpenV Wiki

• Updated Nov 25, 2017

Communicate with Viessmann boilers using the optolink for ESP8266 and ESP32

• Updated Dec 21, 2025
• C++

🔥 vcontrold Daemon for control and logging of Viessmann® type heating devices

• Updated Sep 4, 2024
• C

Splitter for Viessmann Optolink connection

• Updated Jan 31, 2026
• Python

🔥 ViessData 2.1 Wiki

• Updated Dec 3, 2025

Vissmann boiler logger via DIY OptoLink interface.

• Updated Jul 31, 2020
• C++

• Updated Nov 2, 2019
• C++

vogod is a daemon which provides a high-level interface (currently a REST API) to a Viessmann® heating device via Optolink.

• Updated Feb 8, 2024
• Go

🚫 Communication with Vitodens 300 (B3HA) via Optolink

• Updated Nov 24, 2017
• C

• Updated Aug 20, 2024
• Python

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

• Updated Jan 29, 2026
• Python

A Rust-based MQTT bridge for vcontrold

• Updated Jan 29, 2026
• Rust

Java library that accesses a Viessmann heating system via optolink.

• Updated Apr 10, 2024
• Java