# LibreMP: an Epson EasyMP screen caster from packet-capture research

> LibreMP casts desktop screens to Epson EasyMP projectors using a protocol reconstructed from Windows client packet captures. Its Rust core handles registration and login messages, projector QR decoding, JPEG tile streaming and changed-region updates; a CLI and Tauri interface use the same core. The project documents control on TCP 3620 and video on TCP 3621.

- Type: Case study
- Targets: Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-06
- Original resource: <https://github.com/MuazTPM-YT/libre-mp>
- Primary source: <https://github.com/MuazTPM-YT/libre-mp/blob/c0fe797ee8697fd75dbf24fc4eadf041ba8e876e/docs/NOTES.md>
- Catalog page: <https://awesomerea.org/resources/libremp-easymp-case/>
- Record JSON: <https://awesomerea.org/resources/libremp-easymp-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/libremp-easymp-case/index.md)

## Requirements & limits

- **Prerequisites:** An Epson EasyMP-compatible projector and a supported desktop operating system; building requires Rust, Cargo, Node.js, npm, NASM and CMake.
- **Limits:** The keyword-protected login path has not been tried against real hardware; Windows and macOS casting still need hardware testing.
- **License:** MIT License.

## Primary sources

1. <https://github.com/MuazTPM-YT/libre-mp/blob/c0fe797ee8697fd75dbf24fc4eadf041ba8e876e/docs/NOTES.md>
2. <https://github.com/MuazTPM-YT/libre-mp/blob/c0fe797ee8697fd75dbf24fc4eadf041ba8e876e/README.md>

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## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.