{
  "added_at": "2026-11-08",
  "category": "reconstruction-cases",
  "class": "hardware",
  "description_en": "Daybreak rebuilds COLMI R09 smart-ring communication in an offline Android client. Its Kotlin protocol module handles 16-byte commands and checksum validation, reassembles multi-packet sleep records, and processes heart-rate logs, steps and SpO2 data; the app computes local sleep, recovery and activity scores from the readings.",
  "description_zh": "Daybreak 在离线 Android 客户端中重建 COLMI R09 智能戒指通信。Kotlin 协议模块处理 16 字节命令及校验和，重组多包传输的睡眠记录，并解析心率日志、步数和 SpO2 数据；应用在本机计算睡眠、恢复和活动评分。",
  "entry_url": "https://awesomerea.org/resources/daybreak-colmi-r09-case/",
  "entry_url_zh": "https://awesomerea.org/zh/resources/daybreak-colmi-r09-case/",
  "evidence_class": 2,
  "evidence_status": "observed",
  "evidence_url": "https://github.com/reuhenbhalod/DayBreak/blob/21dd3e3d5b1c2d5a0b23ecd2cd69f61f2334ba2e/README.md",
  "group": "cases",
  "id": "daybreak-colmi-r09-case",
  "json_url": "https://awesomerea.org/resources/daybreak-colmi-r09-case/record.json",
  "kind": "case-study",
  "markdown_url": "https://awesomerea.org/resources/daybreak-colmi-r09-case/index.md",
  "markdown_url_zh": "https://awesomerea.org/zh/resources/daybreak-colmi-r09-case/index.md",
  "name": "Daybreak: rebuilding COLMI R09 BLE communication for an offline ring client",
  "name_zh": "Daybreak：重建 COLMI R09 蓝牙通信的离线戒指客户端",
  "record_type": "resource",
  "relationship": "independent-reconstruction",
  "requirement_facets": [
    "prerequisites",
    "prerequisites",
    "limits",
    "license"
  ],
  "requirements": [
    "COLMI R09 smart ring and Android 8.0+ for the app.",
    "JDK 17+ and Android SDK to build.",
    "The source notes firmware-dependent HRV and noisy sleep staging.",
    "MIT license."
  ],
  "requirements_zh": [
    "应用需要 COLMI R09 智能戒指及 Android 8.0 或更新版本。",
    "构建需要 JDK 17 或更新版本及 Android SDK。",
    "项目指出 HRV 数据取决于固件，睡眠分期数据可能有噪声。",
    "采用 MIT 许可证。"
  ],
  "scope": "unknown",
  "targets": [
    "protocol"
  ],
  "url": "https://github.com/reuhenbhalod/DayBreak",
  "verification": "source-reviewed",
  "verified_at": "2026-11-06"
}