OpenHarmony Neptune开发板-MQTT连接华为IoT平台 原创 精华

static int init_socket(mqtt_broker_handle_t *broker, const char *hostname, short port, int keepalive)
{
    int flag = 1;
    struct hostent *hp;

    // 创建套接字
    if((socket_id = socket(PF_INET, SOCK_STREAM, 0)) < 0)
        return -1;

    // 禁用Nagle算法
    if (setsockopt(socket_id, IPPROTO_TCP, 0x01, (char *)&flag, sizeof(flag)) < 0)
    {
        close_socket(&mqtt_broker);
        return -2;
    }

    // 查询主机IP启动
    hp = gethostbyname(hostname);
    if (hp == NULL )
    {
        close_socket(&mqtt_broker);
        return -2;
    }

    struct sockaddr_in socket_address;
    memset(&socket_address, 0, sizeof(struct sockaddr_in));
    socket_address.sin_family = AF_INET;
    socket_address.sin_port = htons(port);
    memcpy(&(socket_address.sin_addr), hp->h_addr, hp->h_length);

    // 连接套接字
    if((connect(socket_id, (struct sockaddr *)&socket_address, sizeof(socket_address))) < 0)
    {
        close_socket(&mqtt_broker);
        return -1;
    }

    // MQTT stuffs
    mqtt_set_alive(broker, mqtt_keepalive);
    broker->socketid = socket_id;
    broker->mqttsend = send_packet;
    return 0;
}
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static int subscribe_topic(char *topic)//订阅主题
{
    unsigned short msg_id = 0, msg_id_rcv = 0;
    int packet_lengthgth = 0;
	int ret = -1;
 
    if(topic == NULL) {
        return -1;
    }
    
    ret = mqtt_subscribe(&mqtt_broker, topic, &msg_id);
	if( ret == -1 ) {
		close_socket(&mqtt_broker);
		return -1;
	}
    packet_lengthgth = read_packet(MQTT_DEMO_READ_TIME_SEC, MQTT_DEMO_READ_TIME_US);
    if(packet_lengthgth < 0)
    {
        printf("Error(%d) on read packet!\n", packet_lengthgth);
        close_socket(&mqtt_broker);
        return -1;
    }
 
    if(MQTTParseMessageType(pcaket_buffer) != MQTT_MSG_SUBACK)
    {
        printf("SUBACK expected!\n");
        close_socket(&mqtt_broker);
        return -2;
    }
 
    msg_id_rcv = mqtt_parse_msg_id(pcaket_buffer);
	if(msg_id != msg_id_rcv)
	{
		printf("%d message id was expected, but %d message id was found!\n", msg_id, msg_id_rcv);
        close_socket(&mqtt_broker);
        return -3;
	}
 
    return 0;
}
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/*************************打包发布请求*****************/
static int packPublishReq(char *jsonBuffer)
{
	cJSON *jsRet = NULL;
	cJSON *jsArray = NULL;
	int ackLen = 0;
	
	jsRet = cJSON_CreateObject();
	if(jsRet)
	{   
		jsArray = cJSON_CreateArray();
        cJSON_AddItemToObject(jsRet, "services", jsArray);
        {
            cJSON *arrayObj_1 = cJSON_CreateObject();
            cJSON_AddItemToArray(jsArray, arrayObj_1);
			cJSON_AddStringToObject(arrayObj_1, "service_id", "Temperature");

            cJSON *arrayObj_2 = cJSON_CreateObject();
            cJSON_AddItemToObject(arrayObj_1, "properties", arrayObj_2);
            cJSON_AddStringToObject(arrayObj_2, "temp", Temperature.temp);
            cJSON_AddStringToObject(arrayObj_2, "humi", Temperature.humi);
            cJSON_AddStringToObject(arrayObj_2, "led",  Temperature.ON_OFF);
            
            cJSON_AddStringToObject(arrayObj_1,"event_time", Temperature.timestamp);
        }
        char *databuf = cJSON_PrintUnformatted(jsRet);
		if(databuf) {
			if( jsonBuffer ) {
				ackLen = strlen(databuf);
				memcpy( jsonBuffer, databuf,ackLen);
			}
            tls_mem_free(databuf);
        }
        cJSON_Delete(jsRet); 
    }
    return ackLen;
}
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下行 $oc/devices/{device_id}/sys/commands/request_id={request_id}
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上行：$oc/devices/{device_id}/sys/commands/response/request_id={request_id}
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            len = mqtt_parse_pub_topic(pcaket_buffer, topic);    //接收平台下发的topic
	        topic[len] = '\0';
	        len = mqtt_parse_publish_msg(pcaket_buffer, &msg);
            strncpy(request_id,topic+63,47);                        
            sprintf(ACK_TOPIC,"%s%s",MQTT_DEMO_ACK_TOPIC,request_id);//复制request_id={request_id}
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#define MQTT_DEMO_CLIENT_ID            "616268529fff74057ddd731b_202110101314_0_0_2021101006"                        //ID
#define MQTT_DEMO_DEVICE_ID            "616268529fff74057ddd731b_202110101314"
#define MQTT_DEMO_PASSWORD             "b6fd9631cd69eee9ce565a36564b93d26760a49ace05be96cbe9dfaab91f275d"
#define MQTT_DEMO_SUB_TOPIC            "$oc/devices/616268529fff74057ddd731b_202110101314/sys/commands/#"             //订阅主题
#define MQTT_DEMO_PUB_TOPIC            "$oc/devices/616268529fff74057ddd731b_202110101314/sys/properties/report"      //发布主题
#define MQTT_DEMO_ACK_TOPIC            "$oc/devices/616268529fff74057ddd731b_202110101314/sys/commands/response/"
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MQTT_CONF_USERNAME_LENGTH 修改为64
MQTT_CONF_PASSWORD_LENGTH 修改为64+8
clientid[50]修改为clientid[64]
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