HID devices deliver all reports. ...
I finally had occasion to start looking at HID stuff, so I'll
stick my nose in here: the spec says otherwise. There's a note
at the top of p.18 that says:

Only Input reports are sent via the Interrupt In pipe.
Feature and Output reports must be initiated by the host
via the Control pipe or an optional Interrupt Out pipe.

So it'd make sense that the mouse events are "input" reports,
while battery status is a "feature" report.

- Dave





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