text: #include <stdbool.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <mosquitto.h>
  
  static int run = -1;
  
  void on_connect(struct mosquitto *mosq, void *obj, int rc)
  {
  	if(rc){
  		exit(1);
  	}else{
  		mosquitto_publish(mosq, NULL, "pub/qos1/test", strlen("message"), "message", 1, false);
  	}
  }
  
  void on_publish(struct mosquitto *mosq, void *obj, int mid)
  {
  	mosquitto_disconnect(mosq);
  }
  
  void on_disconnect(struct mosquitto *mosq, void *obj, int rc)
  {
  	run = 0;
  }
  
  int main(int argc, char *argv[])
  {
  	int rc;
  	struct mosquitto *mosq;
  
  	int port = atoi(argv[1]);
  
  	mosquitto_lib_init();
  
  	mosq = mosquitto_new("publish-qos1-test", true, NULL);
  	mosquitto_int_option(mosq, MOSQ_OPT_PROTOCOL_VERSION, MQTT_PROTOCOL_V5);
  	mosquitto_connect_callback_set(mosq, on_connect);
  	mosquitto_disconnect_callback_set(mosq, on_disconnect);
  	mosquitto_publish_callback_set(mosq, on_publish);
  	mosquitto_message_retry_set(mosq, 3);
  
  	rc = mosquitto_connect(mosq, "localhost", port, 60);
  
  	while(run == -1){
  		mosquitto_loop(mosq, 300, 1);
  	}
  
  	mosquitto_lib_cleanup();
  	return run;
  }
  