smart-green-house-server-and-front-end/how_to_use_mqtt/pub1.c

#include <mosquitto.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int isConnected = 0;
void connect_callback(struct mosquitto *mosq, void *obj, int rc)
{
    if (rc == 0)
    {
        printf("---连接服务器成功---\n");
        isConnected = 1;
    }
}
int main(int argc, char const *argv[])
{
    if (argc < 3)
    {
        printf("format: ./pub1 msgid topic msg");
        return -1;
    }
    mosquitto_lib_init();
    struct mosquitto *client = mosquitto_new(NULL, true, NULL);
    mosquitto_connect_callback_set(client, connect_callback);
    mosquitto_connect(client, "10.12.156.19", 1883, 60);
    mosquitto_loop_start(client);
    while (isConnected == 0)
        ;
    int msg_id = atoi(argv[1]);
    char *topic = (char *)argv[2];
    char *msg = (char *)argv[3];
    int flag =
        mosquitto_publish(client, &msg_id, topic, strlen(msg), msg, 1, true);
    if (flag == MOSQ_ERR_SUCCESS)
    {
        printf("---消息发布成功: %s(%d):%s---\n", topic, msg_id, msg);
        mosquitto_destroy(client);
        mosquitto_lib_cleanup();
    }
    return 0;
}