Reverse engineering a DJI Mavic Pro remote: meeting the DUML protocol (opens in new tab)

A hobby project on the side. I bought a Mavic Pro Gen1 shell and its GL200A remote for a few euros, sold as non-functional. Rather than just repairing them, I wanted to understand how they talk to each other. This is my logbook — and I want to be upfront that I'm a beginner at reverse engineering, standing on the shoulders of a community that did the hard work. First: is this legal? It's the question to ask before touching someone else's hardware — and in Europe the answer is nuanced but reas...