Provided by: libsdl3-doc_3.2.20+ds-2_all 

NAME
SDL_hid_write - Write an Output report to a HID device.
SYNOPSIS
#include <SDL3/SDL_hidapi.h>
int SDL_hid_write(SDL_hid_device *dev, const unsigned char *data, size_t length);
DESCRIPTION
The first byte of data must contain the Report ID. For devices which only support a single report, this
must be set to 0x0. The remaining bytes contain the report data. Since the Report ID is mandatory, calls
to SDL_hid_write() will always contain one more byte than the report contains. For example, if a hid
report is 16 bytes long, 17 bytes must be passed to SDL_hid_write(), the Report ID (or 0x0, for devices
with a single report), followed by the report data (16 bytes). In this example, the length passed in
would be 17.
SDL_hid_write() will send the data on the first OUT endpoint, if one exists. If it does not, it will send
the data through the Control Endpoint (Endpoint 0).
FUNCTION PARAMETERS
dev a device handle returned from SDL_hid_open().
data the data to send, including the report number as the first byte.
length the length in bytes of the data to send.
RETURN VALUE
for more information.
AVAILABILITY
This function is available since SDL 3.2.0.
Simple Directmedia Layer SDL 3.2.20 SDL_hid_write(3)