Is there a link to the hardware they mention in the description?

They built their own circuit board but the core module that does the 802.11p is just a ESP32-C5

Yes, I understand that. The translation makes it sound like they have published the software and design, or are somehow making boards available.

>To improve coverage, we need your support! We have built a board with *ESP32-C5* and *PoE* that allows you to capture *C-ITS* packages yourself, and provide us for our face-up card, or process it yourself.

Edit: found it, https://codeberg.org/opentrafficmap

Pastebin here containing AI-generated English translation, LGTM: https://pastebin.com/fK5Atwzg

Happy to see this popping up here, I watched the Linux Tage talk last week. The demo just kept getting better and better, to a point where the audience just interruptively cheers and claps away. I know nothing about the contents, but this warmed my heart. True hacker project!