rt-thread软件包学习之kawaiimqtt

kawaiimqtt:

　　

/* 5. wifi connect */
    rt_wlan_connect(WIFI_SSID, WIFI_KEY);

    /* 6. startup mqtt client  */
    mqtt_log_init();
    rt_snprintf(cid, sizeof(cid), "rtthread%d", rt_tick_get());
    /* check network connection status */

    net_dev = netdev_get_by_name("w0");
    while(!(netdev_is_internet_up(net_dev)))
    {
        rt_thread_mdelay(100);
        timeout++;
        if(timeout == 200)
        {
            rt_kprintf("wifi connect failed!
");
            return -RT_ERROR;
        }
    }

    client = mqtt_lease();

    mqtt_set_host(client, MQTT_URL);
    mqtt_set_port(client, MQTT_PORT);
    mqtt_set_user_name(client, "rt-thread");
    mqtt_set_password(client, "rt-thread");
    mqtt_set_client_id(client, cid);
    mqtt_set_clean_session(client, 1);

    if(mqtt_connect(client))
    {
        KAWAII_MQTT_LOG_E("%s:%d %s()... mqtt connect failed...", __FILE__, __LINE__, __FUNCTION__);
        is_started = 0;
        return -RT_ERROR;
    }

    is_started = 1;
    mqtt_subscribe(client, SUB1_NAME, QOS0, sub_topic_handle_led);
    mqtt_subscribe(client, SUB2_NAME, QOS1, sub_topic_handle_num);
    mqtt_subscribe(client, SUB_OTA, QOS2, sub_topic_handle_ota);

    tid3 = rt_thread_create("mq_pub", mqtt_t_publish, RT_NULL, 2048, 13, 10);
    if (tid3 != RT_NULL)
    {
        rt_thread_startup(tid3);
    }

1保证网络连接

2设置mqtt客户端：远端URL,端口，客户端ID,用户名，密码。。。

3连接远程mqtt服务器

4订阅主题：主题,Qos,收到主题时的响应（将主题名和主题内容分离出来，然后匹配响应）

typedef struct {
    char **str;     //the PChar of string array
    size_t num;     //the number of string
}IString;

/* 拆分字符串 */
static int Split(char *src, char *delim, IString* istr)//split buf
{
    int i;
    char *str = NULL, *p = NULL;

    (*istr).num = 1;
    str = (char*)rt_calloc(strlen(src)+1,sizeof(char));
    if (str == NULL) return 0;
    (*istr).str = (char**)rt_calloc(1,sizeof(char *));
    if ((*istr).str == NULL) return 0;
    strcpy(str,src);

    p = strtok(str, delim);
    (*istr).str[0] = (char*)rt_calloc(strlen(p)+1,sizeof(char));
    if ((*istr).str[0] == NULL) return 0;
    strcpy((*istr).str[0],p);
    for(i = 1; (p = strtok(NULL, delim)); i++)
    {
        (*istr).num++;
        (*istr).str = (char**)rt_realloc((*istr).str,(i+1)*sizeof(char *));
        if ((*istr).str == NULL) return 0;
        (*istr).str[i] = (char*)rt_calloc(strlen(p)+1,sizeof(char));
        if ((*istr).str[0] == NULL) return 0;
        strcpy((*istr).str[i],p);
    }
    rt_free(str);
    str = p = NULL;

    return 1;
}
static void sub_topic_handle_led(void* client, message_data_t* msg)
{
    (void) client;
    KAWAII_MQTT_LOG_I("-----------------------------------------------------------------------------------
");
    KAWAII_MQTT_LOG_I("%s:%d %s()...
topic: %s
message:%s
", __FILE__, __LINE__, __FUNCTION__, msg->topic_name, (char*)msg->message->payload);
    KAWAII_MQTT_LOG_I("-----------------------------------------------------------------------------------
");

    int i;
    IString istr;
    struct file_msg file_msg;
    char *tick_num;

    if (Split(msg->message->payload," ",&istr))
    {
        for (i = 0; i < istr.num; i++)
            rt_kprintf("%s
",istr.str[i]);

        if(i == 2)
        {
            if(rt_strncmp(istr.str[0], "led", 3))
            {
                KAWAII_MQTT_LOG_E("command error!
");
            }
            else
            {
                if(!(rt_strncmp(istr.str[1], "off", 3)))
                {
                    rt_pin_write(LED_PIN_RED, PIN_HIGH);
                }
                else if(!(rt_strncmp(istr.str[1], "on", 2)))
                {
                    rt_pin_write(LED_PIN_RED, PIN_LOW);
                }
                else
                {
                    KAWAII_MQTT_LOG_E("state command error!
");
                    for (i = 0; i < istr.num; i++)
                        rt_free(istr.str[i]);
                    rt_free(istr.str);
                    return;
                }

                tick_num = rt_calloc(1, 10);
                if (tick_num == RT_NULL) {
                    rt_kprintf("memory is not enough 
");
                }
                else {
                    itoa(rt_tick_get(), tick_num, 10);
                    file_msg.timestamp = tick_num;
                    file_msg.cmd = istr.str[0];
                    file_msg.state = istr.str[1];
                    file_msg.str = istr.str;

                    rt_mq_send(&mq_demo, &file_msg, sizeof(file_msg));
                }
            }
        }
        else
        {
            KAWAII_MQTT_LOG_E("command error! 
");
            for (i = 0; i < istr.num; i++)
                rt_free(istr.str[i]);
            rt_free(istr.str);
        }

    }
    else
    {
        KAWAII_MQTT_LOG_E("Split failure!
");
    }
}

5 建立发布线程用于发布主题（设置主题Oos,负载内容，然后向指定主题发送（若是数据采集可以用消息队列等待发送）。）

/* 板子发布消息的线程 */
static void mqtt_t_publish(void *parameter)
{
    char pub_buf[64];
    mqtt_message_t msg;
    memset(&msg, 0, sizeof(msg));

    rt_thread_mdelay(2 * RT_TICK_PER_SECOND);

    while(1)
    {
        if(is_started)
        {
            memset(pub_buf, 0, 64);

            sprintf(pub_buf, "%d", usMRegHoldBuf[SLAVE_ADDR - 1][MB_RECV_REG_NUM]);

            msg.qos = QOS0;
            msg.payload = pub_buf;

            mqtt_publish(client, PUB_NAME, &msg);
        }
        rt_thread_mdelay(5 * RT_TICK_PER_SECOND);
    }
}