in roscpp_azure_iothub/src/ros_azure_iothub_cpp_node.cpp [167:173]
static void send_confirm_callback(IOTHUB_CLIENT_CONFIRMATION_RESULT result, void* userContextCallback)
{
(void)userContextCallback;
// When a message is sent this callback will get envoked
g_message_count_send_confirmations++;
ROS_INFO("Confirmation callback received for message %lu with result %s", (unsigned long)g_message_count_send_confirmations, MU_ENUM_TO_STRING(IOTHUB_CLIENT_CONFIRMATION_RESULT, result));
}