this post was submitted on 09 Nov 2025
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How to reverse engineer USB HID on Linux (popovicu.com)
submitted 1 day 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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[–] frongt@lemmy.zip 2 points 20 hours ago (1 children)

Ah okay, it was APC that had the UPS with the "serial" port.

[–] curbstickle@anarchist.nexus 1 points 20 hours ago

The dumb "on battery" cable, what a joke that was