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I'm currently reverse engineering Miele's 2nd gen optical interface on their newer appliances.
It uses a completely different protocol which allows you to communicate with the internal bus system of the machine (MBus). The authentication is quite simple though.
Let's see which one of you figures out the secret key first 😉
Next up, finding the diagnostic keys for a Miele G 651 I PLUS-3 dishwasher.
Communicating with an unmodified Miele W 2446 washing machine via the optical interface. The adapter mainly consists of an ESP32-C6 and an OSRAM SFH 7250 infrared emitter & phototransistor. I still have to work on a better mounting solution though...
Dumping the mask ROM & RAM from the electronics board of a Miele W 961 washing machine via the optical PC interface.
Detailed blog post coming soon!