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How Does BREMA Make a KNX Stick Its Own MCP Server, and Where Does PoE W5500 Fit?

BREMA firmware makes busware's TUL KNX stick answer MCP over HTTP, so an agent can commission KNX devices. A PoE W5500 extension is the wired path.

Benjamin

Published August 15, 2026

Original author: Dirk Tostmann · GermanyOriginal source (new tab)

How Does BREMA Make a KNX Stick Its Own MCP Server, and Where Does PoE W5500 Fit?

Components

Hardware components

WIZnet parts

Project description

A KNX Stick an Agent Can Commission BREMA is firmware documentation from busware, a small German hardware shop best known, in its own words, for the CUL and the open-source firmware culfw and a-culfw. It runs on the busware TUL stick, and it does something most KNX gateways do not attempt: the stick answers MCP on your LAN, so an AI agent can commission KNX devices directly, with no ETS project and no cloud account in the path. A PoE extension built around a WIZnet W5500 gives that stick its wired option. The TUL V3.1 board. USB-C at one end, the KNX bus terminals at the other. Photo…

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