oh wow, this is cool! I managed to reverse engineer a BS120 led display[1], we ended up hooking it into our hackerspace's[2] home assistant instance, displaying everything from static messages to when trams are departing. I enjoyed the challenge of REing it by hand, but the ESP32 firmware to connect it was vibed by a fellow member.
[1]: https://git.sr.ht/~e-topy/bs120 [2]: https://base48.cz; feel free to come by anytime