[riot-notifications] [RIOT-OS/RIOT] usbus/hid_io: add missing header file, add RX callback function (#16689)

Francisco notifications at github.com
Mon Aug 2 17:03:31 CEST 2021

> As of now only one callback function can be registered and would be overwritten by a subsequent call to `usb_hid_io_set_rx_cb`. Since it could be the case that multiple applications want to register this callback, a better solution would be to use a linked_list of callback functions.
> What do you guys think @PeterKietzmann @dylad @bergzand ?

Can you expand on this? Do you have a use case in mind with two interesting applications? I'm not overly familiar with this, but if the HID device is a mouse wouldn't there be a single controller for all the events, and therefore only the need to register a single callback?

Wouldn't it make sense for the callback to at least have a void pointer argument?

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