FreeMDU is an open-source project providing hardware and software tools to communicate with Miele appliances through their optical infrared diagnostic interface. It offers a free alternative to Miele's proprietary diagnostic software, enabling device diagnostics, testing, and home automation integration via MQTT and Home Assistant. The project includes a protocol library, terminal-based diagnostic tool, and communication adapter firmware written in Rust. It supports appliances manufactured after 1996 with confirmed compatibility for several dishwasher and washing machine models.
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