Case study

OpenWatch: reconstructing the LJ736/LY736D smartwatch BLE client

OpenWatch implements an Android companion for LJ736/LY736D-based smartwatches using BLE commands reconstructed from the LaxaFit Pro APK and captured traffic. It handles pairing, notifications and clock synchronization locally, and can buzz the watch to help locate it. Protocol notes describe packet framing and watch-face transfer; the author reports that custom watch faces still display as blank black screens.

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

Stars: 2
Last commit: 2026-08-19
Language: Kotlin
License (GitHub): MIT

GitHub data as of 2026-11-10

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Evidence

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

How evidence classes are assigned

Requirements & limits

Prerequisites: Android Studio, JDK 17 and Gradle 8; minimum Android SDK level 26.
Prerequisites: Custom watch-face builds require the user's own LaxaFit Pro font asset.
Scope: A compatible LJ736/LY736D watch; hardware testing covers one LJ736 board with a 240×296 display.
License: MIT License.

Cite

BibTeX

@misc{openwatch-ly736d-case,
  title = {{OpenWatch: reconstructing the LJ736/LY736D smartwatch BLE client}},
  howpublished = {\url{https://github.com/mehranshahmiri/openwatch-LY736D}},
  url = {https://github.com/mehranshahmiri/openwatch-LY736D},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/openwatch-ly736d-case/}}
}

Plain text

OpenWatch: reconstructing the LJ736/LY736D smartwatch BLE client. https://github.com/mehranshahmiri/openwatch-LY736D (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/openwatch-ly736d-case/

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Primary sources

README.md GitHub · mehranshahmiri/openwatch-LY736D · Revision 9a79b6e