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, int flags, const mosquitto_property *properties)
  {
  	int i;
  
  	if(rc){
  		exit(1);
  	}
  
  	for(i=0; i<6; i++){
  		mosquitto_publish_v5(mosq, NULL, "topic", 5, "12345", 1, false, NULL);
  	}
  }
  
  void on_publish(struct mosquitto *mosq, void *obj, int mid, int reason_code, const mosquitto_property *properties)
  {
  	if(mid == 6){
  		mosquitto_disconnect(mosq);
  		run = 0;
  	}
  }
  
  int main(int argc, char *argv[])
  {
  	int rc;
  	struct mosquitto *mosq;
  	mosquitto_property *props = NULL;
  
  	int port = atoi(argv[1]);
  
  	mosquitto_lib_init();
  
  	mosq = mosquitto_new("publish-qos1-test", true, &run);
  	if(mosq == NULL){
  		return 1;
  	}
  	mosquitto_int_option(mosq, MOSQ_OPT_PROTOCOL_VERSION, MQTT_PROTOCOL_V5);
  
  	mosquitto_connect_v5_callback_set(mosq, on_connect);
  	mosquitto_publish_v5_callback_set(mosq, on_publish);
  
  	rc = mosquitto_connect_bind_v5(mosq, "localhost", port, 60, NULL, NULL);
  
  	while(run == -1){
  		mosquitto_loop(mosq, 300, 1);
  	}
  
  	mosquitto_destroy(mosq);
  	mosquitto_lib_cleanup();
  	return run;
  }
  