WearOS DSU Motion Source

The project aims to reverse engineer MotionSource by sshnuke, which was developed to utilize the Cemuhook protocol for gyroscope and accelerometer values to be used with emulators such as Cemu.

This application runs a CemuHook (DSU) server on your Wear OS device, allowing you to use its high-fidelity motion sensors for gyro aiming and other motion-controlled actions in your favorite games.

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Features

• High-Fidelity Motion Control
  Utilizes your watch's fused GAME_ROTATION_VECTOR sensor for stable, low-latency motion tracking.

• Emulator Compatibility
  Fully compatible with any emulator that supports the CemuHook DSU client protocol, including Cemu and Dolphin.

• Simple UI
  A clean, single-button interface designed for Wear OS. Just start the server and play.

• Power Efficient
  Uses power and Wi-Fi locks to ensure a stable connection during gameplay without excessive battery drain and prevents any screen locks to ensure smooth experience.

• Modern & Native
  A complete, native Android application built from scratch for modern Wear OS versions.

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Requirements

• A Wear OS watch (Wear OS 3 or newer recommended).
• A PC running an emulator or any cemuhook compatible software.
• Both your watch and your PC must be connected to the same Wi-Fi network.

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How It Works

• This application implements a CemuHook server that listens for UDP packets on port 26760.
• It uses a subscribe-and-stream model:
  • The server waits for a client (the emulator) to send a "data request" packet.
  • Upon receiving the first request, it registers the client’s IP address and starts a dedicated background thread.
  • This thread continuously streams motion data packets to the client at a high frequency.
• The server uses the GAME_ROTATION_VECTOR sensor to get a stable orientation. It calculates:
  • A gravity vector (sent as accelerometer data).
  • A real-time rotation rate (sent as gyroscope data).
• The sensor data is transformed from the watch’s portrait coordinate system to the landscape system expected by a standard gamepad before being sent.
• If the server stops receiving heartbeat requests from the client for more than 5 seconds, it automatically stops the stream to save battery.

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🛠 Building from Source

git clone https://github.com/justushar/DSU_Server_WearOS.git

1. Open the project in the latest version of Android Studio.

2. Let Gradle sync the project dependencies.

3. Build the project using Build > Make Project.

4. The installable APK will be located in:

app/build/outputs/apk/debug/

Installation

Check the releases tab under Releases.

1. Download the APK on your PC.
2. Install ADB via chocolatey or any other package manager.
3. Turn on Developer Options by clicking on Build Number in About Settings on the Wear OS device.
4. Turn on ADB debugging and wireless debugging and select the wifi network to pair.
5. Connect to the same wifi network with your host system.
6. Pair the watch to the host via the following commands.

    adb pair [IP_ADDR][PORT_NUMBER][PAIRING CODE]
   adb connect [IP_ADDR][PORT]

7. Run the following command in the directory containing the APK after connecting to the device.

adb install DSU_Server.apk

8. The APK will be installed via streamed install and will be available to use.

Contribute

I would love contributions to the project, please open up an issue first and describe as per the reference.

License

The project is licensed under Apache License.