docs

Documentation

The copyright of the Reports, Firmware, and App belongs to

Hangzhou Contact Interactive Information Technology Co., Ltd. AND

Hangzhou Lianluo Interactive Information Technology Co., Ltd. AND

杭州联络互动信息科技股份有限公司

Hardware

• Battery: 3.7V / 350 mAh = 1.295 Wh
• SoC: nRF51822-QFAA
• Sensor: PMS7003
• RTC: PCF8563TS
• Protocol design
• PINOUT

Reports

• CMIIT ID: 2017DP6736
• Bottom of the box (Chinese)
• User Manual (Chinese)
• China RoHS Compliance (Chinese)
• Q/BJLLHD002-2017 (Chinese)
  From http://www.cpbz.gov.cn/standard.do?i=Q-91330000740545604A-201705311540-0004

Firmware

DFU firmware

3_16.zip

The file extract from Official Android app

Can via nRF Connect - DFU function, Upgrade to 1.16 version.

Dumpfile

pm25_app_dump.bin

The file internal version 1.12
Suitable for reverse engineering
But not suitable for restore to device

See NRF51822 code readout protection bypass a how to

Decompile App Guide

Original app backup: dumps/20180211180753SFmSTILc83m0.apk
SHA 1: 71c84a76b7530c67897fad6108f8fb5d71749151
SHA 256: c53c56fa4ba75d6c777e8cf553090ecdd2601b80c377c0fb5da07ad37097fc5a

The file from:
http://mops.lianluo.com/vida/xinfeng/app/download (unavailable)
https://mops-oss.lianluo.com/xinfeng/software/20180211180753SFmSTILc83m0.apk (unavailable)

Specific files

• Actions: Fetch all data
  From com/lianluo/xinfeng/XinfengApplication.class

• Actions: Request history, Set RTC
  From com/lianluo/xinfeng/ui/home/presenter/HomePresenter.class

• Actions: Measurement interval, Measurement type, Shutdown
  From com/lianluo/xinfeng/ui/device/control/presenter/DanpinControlPresenter.class

Teardown

• https://blog.megumifox.com/public/2020/09/04/忻風隨身-pm2.5-檢測儀開箱和拆解/ (Chinese)