Case study

catbus99: reconstructing Epomaker TH99 Pro screen control over USB-HID

catbus99 reconstructs control of the Epomaker TH99 Pro keyboard display from captured driver WebHID traffic. Its Rust client sends USB-HID reports to display images and rendered widgets, while a protocol document maps the configuration and TFT interfaces. A daemon governs writes to the display's flash storage.

Targets: Protocol
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-06
Evidence class: C2 code & docs, no demo or download

Stars: 1
Last commit: 2026-09-30
Language: Rust
License (GitHub): MIT

GitHub data as of 2026-11-10

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Evidence

Observed: Code, documentation and a demo observed; no download method found.
Checked: 2026-11-08

How evidence classes are assigned

Requirements & limits

Prerequisites: Epomaker TH99 Pro connected by USB cable; macOS or Linux and Rust 1.82+.
Limits: The display is not reachable over 2.4 GHz or Bluetooth.
Limits: Screen uploads are subject to a rate limit with a five-minute floor.
License: MIT License.

Cite

BibTeX

@misc{catbus99-case,
  title = {{catbus99: reconstructing Epomaker TH99 Pro screen control over USB-HID}},
  howpublished = {\url{https://github.com/terraboops/catbus99}},
  url = {https://github.com/terraboops/catbus99},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/catbus99-case/}}
}

Plain text

catbus99: reconstructing Epomaker TH99 Pro screen control over USB-HID. https://github.com/terraboops/catbus99 (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/catbus99-case/

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About this entry

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Primary sources

docs/PROTOCOL.md GitHub · terraboops/catbus99 · Revision 3415745
README.md GitHub · terraboops/catbus99 · Revision 3415745