# SPORTident SRR: reconstructing the short-range radio link

> SPORTident SRR reconstructs the 2.4 GHz radio exchange used by SIAC cards and BSF8-SRR stations to send punches. Its documentation maps CC2500 settings, packet fields, acknowledgements and timing, while an ESP32/CC2500 sketch receives and acknowledges frames and a Python tool decodes captures.

- Type: Case study
- Targets: Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-08
- Original resource: <https://github.com/open-orienteering/srr-protocol>
- Primary source: <https://github.com/open-orienteering/srr-protocol/blob/0eb596705b08ba86b17109706c4d097aa1acea2d/README.md>
- Catalog page: <https://awesomerea.org/resources/sportident-srr-protocol-case/>
- Record JSON: <https://awesomerea.org/resources/sportident-srr-protocol-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/sportident-srr-protocol-case/index.md)

## Requirements & limits

- **Prerequisites:** An ESP32 development board and 3.3 V CC2500 module for the reference receiver.
- **Prerequisites:** Arduino IDE with the ESP32 core, or arduino-cli, to build the receiver.
- **Limits:** Some header bytes and retransmission behavior remain unexplained.
- **License:** MIT license for code, documentation and photos.

## Primary sources

1. <https://github.com/open-orienteering/srr-protocol/blob/0eb596705b08ba86b17109706c4d097aa1acea2d/README.md>
2. <https://github.com/open-orienteering/srr-protocol/blob/0eb596705b08ba86b17109706c4d097aa1acea2d/docs/protocol.md>

## More in Protocols

- [Tapo V4: reconstructing C510W local control and media protocols](https://awesomerea.org/resources/tapo-v4-protocol-case/index.md) · Case study
- [Omni Tray: reconstructing Arctis Nova Pro Omni USB control](https://awesomerea.org/resources/omni-tray-arctis-protocol-case/index.md) · Case study
- [tapo-local: reconstructing local control of the Tapo P110](https://awesomerea.org/resources/tapo-local-case/index.md) · Case study
- [castty: reconstructing Mionix Castor control on Linux](https://awesomerea.org/resources/castty-mionix-castor-case/index.md) · Case study
- [legion-gpu-rgb: reconstructing Lenovo GPU lighting control](https://awesomerea.org/resources/legion-gpu-rgb-case/index.md) · Case study
- [SoundcoreBridge: reconstructing Soundcore Space 2 headphone controls](https://awesomerea.org/resources/soundcorebridge-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.