According to page 17 of https://dl.vive.com/Tracker/Guideline/HTC_Vive_Tracker_Developer_Guidelines_v1.3.pdf it looks like to trigger the button presses on the trackers you simply close the connection between the ground pin and the appropriate pin for the button you want. This works for the grip, trigger and menu buttons but it doesn't seem to work for the trackpad button. I tried on two different trackers and in a couple different games. Any information on how to make the trackpad button work?
Also can we use the pogo pins to do the x and y axis of the touchpad somehow or is that only available through USB?
There is also a "Vibrator" or "Digital output" pin with no information on how to use it. I suppose I could get an oscilloscope and probably figure it out but it would be nice to just have some documentation.
Thanks guys, otherwise the documentation has been great.