# fcp-stuff: mapping the FirstClass TCP protocol

> fcp-stuff documents the FirstClass client-server protocol over TCP. Its notes cover command constants, packet structures, login, encryption, and the Docedit document format; the repository also contains JavaScript proxy code.

- Type: Case study
- Targets: Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-07
- Added to the catalog: 2026-11-09
- Original resource: <https://github.com/thatoddmailbox/fcp-stuff>
- Primary source: <https://github.com/thatoddmailbox/fcp-stuff/blob/7a856cc67b2baf9555bee5249556decdae9ab7d3/README.md>
- Catalog page: <https://awesomerea.org/resources/fcp-stuff-case/>
- Record JSON: <https://awesomerea.org/resources/fcp-stuff-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/fcp-stuff-case/index.md)

## Requirements & limits

- **Scope:** The documented transport is TCP.
- **Limits:** The author identifies incomplete details in some format notes.
- **License:** No licence file in the repository.

## Primary sources

1. <https://github.com/thatoddmailbox/fcp-stuff/blob/7a856cc67b2baf9555bee5249556decdae9ab7d3/README.md>
2. <https://github.com/thatoddmailbox/fcp-stuff/blob/7a856cc67b2baf9555bee5249556decdae9ab7d3/docedit.md>

## More in Protocols

- [Orthoplay: reconstructing OD-11 speaker WebSocket commands](https://awesomerea.org/resources/orthoplay-re-case/index.md) · Case study
- [Chsmartbulb: reconstructing Bluetooth bulb controls](https://awesomerea.org/resources/chsmartbulb-led-bulb-speaker-case/index.md) · Case study
- [mf4700-print-scan: reconstructing Canon MF4700 print and scan protocols](https://awesomerea.org/resources/mf4700-print-scan-case/index.md) · Case study
- [Kenwood KNS: documenting ARCP-590G radio communication](https://awesomerea.org/resources/arcp-590g-kns-case/index.md) · Case study
- [truemove3-re: mapping a gaming mouse sensor's SPI interface](https://awesomerea.org/resources/truemove3-re-case/index.md) · Case study
- [Aqara G410: reconstructing doorbell cloud and P2P access](https://awesomerea.org/resources/aqara-g410-protocol-case/index.md) · Case study

## 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.