Getting SteamVR tracking data without a HMD

This is an excerpt from this website: https://www.roadtovr.com/how-to-use-the-htc-vive-tracker-without-a-vive-headset/

• Locate the following configuration file and open it with a text editor: <Steam Directory>steamappscommonSteamVRresourcessettingsdefault.vrsettings
• Search for the “requireHmd” key under “steamvr”, set the value of this key to “false”. 
• If SteamVR is running, close and restart it