WatchPATONERE

WatchPAT ONE Reverse Engineering

Setup

1. Clone this repository to C:\source\itamar\WatchPATONERE.
2. Install .NET 9.0 SDK.
3. Install Claude Code.

By the end of setup your folder structure should look something like this.

c:\source\itamar
|
|- apksrc
|- javasrc
|- WatchPATONERE
|- com.itamarmedical.watchpat.apk

Get APK

1. Download APK from https://apkpure.com/watchpat/com.itamarmedical.watchpat.
2. Rename WatchPAT_4.1.0_APKPure.xapk to WatchPAT_4.1.0_APKPure.zip.
3. Extract com.itamarmedical.watchpat.apk to c:\source\itamar.

Extract APK (optional)

1. Download https://github.com/iBotPeaches/Apktool/releases/download/v2.12.1/apktool_2.12.1.jar.
2. Rename apktool_2.12.1.jar to apktool.jar.
3. Copy apktool.jar and apktool.bat to c:\windows (so you can run batch file from PATH).
4. Open Command Prompt and run apktool.bat d -o c:\source\itamar\apksrc c:\source\itamar\com.itamarmedical.watchpat.apk.

Decompile APK

1. Download https://github.com/skylot/jadx/releases/download/v1.5.3/jadx-gui-1.5.3-with-jre-win.zip.
2. Extract JADX and run jadx-gui-1.5.3.exe.
3. Open c:\source\itamar\com.itamarmedical.watchpat.apk and File > Export Project to C:\source\itamar\javasrc.

Development

1. Start claude in C:\source\itamar\WatchPATONERE.

Building

dotnet restore
dotnet build

Running

dotnet run

Protocol Overview

This application implements the ITAMAR WatchPAT BLE protocol using Nordic UART Service with 24-byte packet headers and CRC-16-CCITT validation.

Key Features:

• ✅ Device discovery and connection
• ✅ LED control (physically verified)
• ✅ Sleep study session management
• ✅ Data packet reception and file saving
• ✅ Finger probe detection testing
• ✅ Device status monitoring

For detailed technical documentation, see:

• PROTOCOL.md - Complete protocol specification with sequence diagrams, packet formats, command IDs, timing requirements, and debugging notes
• CLAUDE.md - Architecture overview and development guidelines for Claude Code

References

• Nordic UART Service Specification
• Windows Bluetooth LE APIs
• GATT Specification