DEPRECATED: Starting with Android P the WiFi RTT is part of the public API! This Android library works as proxy to the hidden To work as wrapper this lib makes heavy use of Java Reflection.
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RttManager Compat

DEPRECATED: The purpose of this library was to make use of the internal RttManager API up to Android Oreo (requires ROOT). With Android P this API is public available in the SDK now and is NOT reflected in this library.

This library wraps the currently only as @SystemAPI available class.

WARNING: This library makes use of Java Reflection to communicate with the Android RttManager. If there are some changes in the RttManager class this could break the library!

The RttManager allows to measure the Round Trip Time (RTT) of a data packet + ACK to Access Point (AP) and back. The standard describing the measurement is IEEE 802.11mc (


  • A rooted Android phone (app needs to be installed in sys/priv-app folder)
  • Min SDK 23 (Marshmallow)
  • Your smartphone supports the IEEE 802.11mc standard. (e.g. has Qualcomm Snapdragon 820 CPU)
  • Your AP support the IEEE 802.11mc standard.


  • Clone the library and add it to your project.
  • Use RttManagerCompat-class to retrieve a wrapper for the
  • Gather the features supported by your phone by call RttManagerCompat.getRttCapabilities().
  • To perform some ranging the following snippet might help:
public void startRanging(@NonNull final ScanResult wifiConfig,
            @NonNull final RttManagerCompat.RttListener rttListener) throws Throwable {        
    final RttManagerCompat.RttParams params = new RttManagerCompat.RttParams();
    params.bssid = wifiConfig.BSSID;
    params.requestType = RttManagerCompat.RTT_TYPE_TWO_SIDED;
    params.frequency = wifiConfig.frequency;
    params.centerFreq0 = wifiConfig.centerFreq0;
    params.centerFreq1 = wifiConfig.centerFreq1;
    params.channelWidth = wifiConfig.channelWidth;
    final RttManagerCompat.RttCapabilities capabilities = tManagerCompat.getRttCapabilities();
    if (capabilities != null) {
        params.LCIRequest = capabilities.lciSupported;
        params.LCRRequest = capabilities.lcrSupported;
    rttManagerCompat.startRanging(new RttManagerCompat.RttParams[]{params}, rttListener);


Please notice that a rooted phone is required

Perform the following steps to install your app containing this SDK:

  • compile the app: ./gradlew clean assembleDebug
  • copy the APK to the phone, e.g. adb push <<path_to_apk>> /sdcard (adb push app/build/outputs/app-debug.apk /sdcard)
  • Open a file manager app, which is capable to perform root operations, eg. ES Filemanager.
  • Copy the APK from /sdcard to /system/priv-app
  • (Optinal) Sometime it is necessary to check the permission of the copied APK. It should be executable by everyone.
  • Reboot the phone. The app should be installed and be available in the app launcher.

More details about the installation can be found here: