Vive Tracker Power Button

Hi all,

I’m working with vive trackers and I am looking to find a way yo easily detect and assign tracker id.
I wondering if I can use the power button of the tracker to trigger an event. I know that it is possible to access this button through the steam vr input configuration page, and change the event it fire but I can’t make it to be received in UE4.

Any Idea ?

Thanks