knx-mqtt-bridge

knx-mqtt-bridge is a software bridge that enables bidirectional communication between KNX home automation systems and MQTT-based IoT ecosystems. It translates KNX group address events into MQTT messages and allows control of KNX devices via MQTT, facilitating integration with modern smart home platforms.

Key Features

• KNX to MQTT Bridging — Forwards KNX events to MQTT topics using the format knx/x/y/z where x/y/z is the group address.
• MQTT to KNX Writing — Writes to KNX devices by publishing MQTT messages to knx/x/y/z/write topics.
• KNX Value Reading — Supports reading KNX values via MQTT messages to knx/x/y/z/read topics.
• ETS Export Support — Automatically converts values using ETS XML exports for accurate datapoint type mapping.
• Raw Buffer Handling — Allows communication with unmapped group addresses using raw byte buffers when needed.
• Docker Container — Includes a Dockerfile for easy deployment in containerized environments.

Philosophy

The project aims to simplify integration between legacy KNX installations and modern MQTT-based IoT systems, providing a reliable, configurable bridge that handles data conversion transparently.