text: #include "dds/dds.h"
  #include "HelloWorldData.h"
  #include <stdio.h>
  #include <stdlib.h>
  
  int main (int argc, char ** argv)
  {
    dds_entity_t participant;
    dds_entity_t topic;
    dds_entity_t writer;
    dds_return_t rc;
    HelloWorldData_Msg msg;
    uint32_t status = 0;
    (void)argc;
    (void)argv;
  
    /* Create a Participant. */
    participant = dds_create_participant (DDS_DOMAIN_DEFAULT, NULL, NULL);
    if (participant < 0)
      DDS_FATAL("dds_create_participant: %s\n", dds_strretcode(-participant));
  
    /* Create a Topic. */
    topic = dds_create_topic (
      participant, &HelloWorldData_Msg_desc, "HelloWorldData_Msg", NULL, NULL);
    if (topic < 0)
      DDS_FATAL("dds_create_topic: %s\n", dds_strretcode(-topic));
  
    /* Create a Writer. */
    writer = dds_create_writer (participant, topic, NULL, NULL);
    if (writer < 0)
      DDS_FATAL("dds_create_writer: %s\n", dds_strretcode(-writer));
  
    printf("=== [Publisher]  Waiting for a reader to be discovered ...\n");
    fflush (stdout);
  
    rc = dds_set_status_mask(writer, DDS_PUBLICATION_MATCHED_STATUS);
    if (rc != DDS_RETCODE_OK)
      DDS_FATAL("dds_set_status_mask: %s\n", dds_strretcode(-rc));
  
    while(!(status & DDS_PUBLICATION_MATCHED_STATUS))
    {
      rc = dds_get_status_changes (writer, &status);
      if (rc != DDS_RETCODE_OK)
        DDS_FATAL("dds_get_status_changes: %s\n", dds_strretcode(-rc));
  
      /* Polling sleep. */
      dds_sleepfor (DDS_MSECS (20));
    }
  
    /* Create a message to write. */
    msg.userID = 1;
    msg.message = "Hello World";
  
    printf ("=== [Publisher]  Writing : ");
    printf ("Message (%"PRId32", %s)\n", msg.userID, msg.message);
    fflush (stdout);
  
    rc = dds_write (writer, &msg);
    if (rc != DDS_RETCODE_OK)
      DDS_FATAL("dds_write: %s\n", dds_strretcode(-rc));
  
    /* Deleting the participant will delete all its children recursively as well. */
    rc = dds_delete (participant);
    if (rc != DDS_RETCODE_OK)
      DDS_FATAL("dds_delete: %s\n", dds_strretcode(-rc));
  
    return EXIT_SUCCESS;
  }
  