k810.cpp

#include <stdio.h>
#include <wchar.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include "hidapi.h"

#define MAX_STR 255


const unsigned char caps_switch[] = {0x0, 0x0b, 0x20, 0x07, 0x00, 0x03, 0x00, 0x40, 0x00, 0xa2, 0x01, 0x02 };

#define HID_VENDOR_ID_LOGITECH          0x046d
#define HID_DEVICE_ID_K810              0xb319

int main(int argc, char* argv[]) {
  int res;
  int i;
  unsigned char buf[65];
  wchar_t wstr[MAX_STR];
  hid_device *handle;

  res = hid_init();

  handle = hid_open_path("Bluetooth_046d_b319_207606bb");

  res = hid_write(handle, caps_switch, 12);
  printf("Result: %d\n", res); // Returns -1

  hid_close(handle);

}