this post was submitted on 09 Nov 2025
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How to reverse engineer USB HID on Linux (popovicu.com)
submitted 10 hours ago by cm0002@europe.pub to c/linux@programming.dev
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I recently added a UPS to my server rack to keep my internet and home network running during a power outage. After unpacking it, I investigated its USB port and discovered it wasn’t for powering other devices. Instead, it connects to a host computer to provide information like battery charge status, remaining runtime, and current load.

I wanted to access this data without relying on third-party software, so I decided to see if I could reverse-engineer the protocol using Linux.

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[–] curbstickle@anarchist.nexus 3 points 7 hours ago

Oh it'd be a great learning exercise for sure, though for that I'd rather see someone read spec and put it into practice. Though that'd be more of a UPS than a USB exercise I guess.