Did you know that VR devices are represented in the USB HID norm ? More precisely in the Usage tables, page 43. This document describes all the usages that a USB device can represent, a sort of abstract devices list, like mouse, joystick…
The types for VR are : Belt, Body Suit, Flexor, Glove, Head Tracker, Head Mounted Display, Hand Tracker, Oculometer, Vest, Animatronic Device.

This documents dates back to 2001 and is obviously outdated.. I’m wondering if any software or hardware is implementing those ?