Case study

qcywatch-android: a QCY Watch GT2 client built from BLE protocol research

qcywatch-android replaces the QCY companion app for the QCY Watch GT2 using BLE frames derived from the vendor app and captured watch traffic. It forwards notifications and weather, exports health data to Health Connect and saves workouts as TCX files; frame handling and parsers are implemented in Kotlin.

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

Stars: 0
Last commit: 2026-10-26
Language: Kotlin
License (GitHub): MIT

GitHub data as of 2026-11-10

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Evidence

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

How evidence classes are assigned

Requirements & limits

Prerequisites: Android 13 or later and a QCY Watch GT2 are required for the documented setup.
Prerequisites: The QCY app must be disabled or uninstalled before use because the watch connects to one app at a time.
Limits: Other QCY watches are unconfirmed; firmware updates and several watch features remain outside the implemented scope.
License: MIT License.

Cite

BibTeX

@misc{qcywatch-android-case,
  title = {{qcywatch-android: a QCY Watch GT2 client built from BLE protocol research}},
  howpublished = {\url{https://github.com/DhrubaDC1/qcywatch-android}},
  url = {https://github.com/DhrubaDC1/qcywatch-android},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/qcywatch-android-case/}}
}

Plain text

qcywatch-android: a QCY Watch GT2 client built from BLE protocol research. https://github.com/DhrubaDC1/qcywatch-android (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/qcywatch-android-case/

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Primary sources

README.md GitHub · DhrubaDC1/qcywatch-android · Revision de3b2ac