Send D2C message #IoTHub

d2cMsg.c

(void)printf("Sending 1 messages to IoTHub every %d seconds for %d messages (Send any message to stop)\r\n", TIME_BETWEEN_MESSAGES, MESSAGES_TO_SEND);
do
{
  if (iothub_info.connected != 0)
  {
    // Send a message every TIME_BETWEEN_MESSAGES seconds
    (void)tickcounter_get_current_ms(tick_counter_handle, &current_tick);
    if ((current_tick - last_send_time) / 1000 > TIME_BETWEEN_MESSAGES)
    {
      static char msgText[1024];
      sprintf_s(msgText, sizeof(msgText), "{ \"message_index\" : \"%zu\" }", msg_count++);

      IOTHUB_MESSAGE_HANDLE msg_handle = IoTHubMessage_CreateFromByteArray((const unsigned char*)msgText, strlen(msgText));
      if (msg_handle == NULL)
      {
        (void)printf("ERROR: iotHubMessageHandle is NULL!\r\n");
      }
      else
      {
        if (IoTHubDeviceClient_LL_SendEventAsync(device_ll_handle, msg_handle, NULL, NULL) != IOTHUB_CLIENT_OK)
        {
          (void)printf("ERROR: IoTHubClient_LL_SendEventAsync..........FAILED!\r\n");
        }
        else
        {
          (void)tickcounter_get_current_ms(tick_counter_handle, &last_send_time);
          (void)printf("IoTHubClient_LL_SendEventAsync accepted message [%zu] for transmission to IoT Hub.\r\n", msg_count);

        }
        IoTHubMessage_Destroy(msg_handle);
      }
    }
  }
  IoTHubDeviceClient_LL_DoWork(device_ll_handle);
  ThreadAPI_Sleep(1);
} while (iothub_info.stop_running == 0 && msg_count < MESSAGES_TO_SEND);

size_t index = 0;
for (index = 0; index < 10; index++)
{
  IoTHubDeviceClient_LL_DoWork(device_ll_handle);
  ThreadAPI_Sleep(1);
}