# DT No.1 F2: reconstructing smartwatch communication

> DT No.1 F2 reconstructs the Bluetooth LE exchange between the smartwatch and its Android companion. The project documents GATT handles, message framing and commands, and implements a Python framework and replacement Android app.

- 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/AbelChT/Reverse-Engineering-No.1-F2>
- Primary source: <https://github.com/AbelChT/Reverse-Engineering-No.1-F2/blob/ae751b96d92d7ccff611264175a60b7e0d5e4b7a/README.md>
- Catalog page: <https://awesomerea.org/resources/dt-no1-f2-watch-protocol-case/>
- Record JSON: <https://awesomerea.org/resources/dt-no1-f2-watch-protocol-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/dt-no1-f2-watch-protocol-case/index.md)

## Requirements & limits

- **Prerequisites:** A DT No.1 F2 smartwatch is the documented device target.
- **Prerequisites:** Building the Android app requires an OpenWeather API key in SecretKeyList.kt.
- **License:** GPL-3.0 License.

## Primary sources

1. <https://github.com/AbelChT/Reverse-Engineering-No.1-F2/blob/ae751b96d92d7ccff611264175a60b7e0d5e4b7a/README.md>
2. <https://github.com/AbelChT/Reverse-Engineering-No.1-F2/blob/ae751b96d92d7ccff611264175a60b7e0d5e4b7a/protocol_documentation/README.md>
3. <https://github.com/AbelChT/Reverse-Engineering-No.1-F2/blob/ae751b96d92d7ccff611264175a60b7e0d5e4b7a/reverse_ingeenering_process.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.