0x0000 root
The entry point of every HID++ 2.0 device. root maps a 16-bit feature ID
to the feature index the device uses for that feature in the current session,
and reports the HID++ protocol version.
A client calls getFeature(featureId) first, then addresses every other feature
by the index it returns. root itself is always at index 0.
Spec: Logitech HID++ 2.0 — x0000 root. Used by: all device access.
Full function and event reference coming soon.
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