Hutterer: Understanding HID report descriptors

For those who would like a deeper understanding of how the human interfacedevice (HID) protocol works, Peter Hutterer has posted adetailed overview. "Originally HID was designed to work overUSB. But just like Shrek the technology world is obsessed with layers sothese days HID works over different transport layers. HID over USB is whatyour mouse uses, HID over i2c may be what your touchpad uses. HID worksover Bluetooth and it's celebrity-diet version BLE. Somewhere, someone outthere is very slowly moving a mouse pointer by sending HID over carrierpigeons just to prove a point. Because there's always that one guy."