FreeMDU

FreeMDU is an open-source toolkit that provides both hardware and software solutions for communicating with Miele appliances through their often overlooked optical diagnostic interface, effectively offering an accessible alternative to the proprietary Miele Diagnostic Utility used by service technicians. This project includes reverse-engineered protocol support, a terminal user interface for diagnostics, and firmware that can act as a USB-UART bridge or standalone communication adapter for home automation systems. Developers and tinkerers can use FreeMDU to read diagnostic codes, monitor appliance internal states, and even integrate device feedback into platforms like Home Assistant using MQTT, making it valuable for repair, automation, and monitoring applications. The repository’s components are split into multiple subprojects.

Features

Reverse-engineered optical diagnostic protocol support
Firmware for USB-UART appliance interfacing
CLI-based diagnostic terminal utility
MQTT integration for Home Assistant and home automation
Modular protocol library for custom tools
Open-source and community extendable

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License

Apache License V2.0

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Additional Project Details

Programming Language

Rust

Related Categories

Rust Communications Software

Registered

2026-02-05

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