概述

IoT Studio服务开发是一个物联网业务逻辑的开发工具，通过编排服务节点的方式快速完成简单的物联网业务逻辑的设计。本文主要使用：定时触发、设备和钉钉机器人节点实现对灯泡的定时控制，并将控制后的结果发送给钉钉机器人。本文以官方文档：定时关灯为基础，针对文档中缺少设备属性上报，钉钉机器人配置参考较老等问题，逐一介绍整个链路的完整实现。

Step By Step

1、创建产品和设备，使用Code完成属性上报

• 1.1 创建产品和设备

• 1.2 使用开源Java MQTT SDK上报属性，参考链接：基于开源JAVA MQTT Client连接阿里云IoT

import com.alibaba.taro.AliyunIoTSignUtil;
import org.eclipse.paho.client.mqttv3.*;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;
import java.util.HashMap;
import java.util.Map;

public class IoTDemoPubSubDemo {

    public static String productKey = "a1Agp******";
    public static String deviceName = "LightDevice1";
    public static String deviceSecret = "RLHDiBljxC7YQE7opM**************";
    public static String regionId = "cn-shanghai";

    // 物模型-属性上报topic
    private static String pubTopic = "/sys/" + productKey + "/" + deviceName + "/thing/event/property/post";
    // 物模型-属性订阅topic
    private static String subTopic = "/sys/" + productKey + "/" + deviceName + "/thing/service/property/set";
    private static MqttClient mqttClient;

    public static void main(String [] args){

        initAliyunIoTClient();
        postDeviceProperties();
        try {
            mqttClient.unsubscribe(pubTopic);  //取消订阅
            mqttClient.subscribe(subTopic); // 订阅Topic
        } catch (MqttException e) {
            System.out.println("error:" + e.getMessage());
            e.printStackTrace();
        }

        // 设置订阅监听
        mqttClient.setCallback(new MqttCallback() {
            @Override
            public void connectionLost(Throwable throwable) {
                System.out.println("connection Lost");
            }

            @Override
            public void messageArrived(String s, MqttMessage mqttMessage) throws Exception {
                System.out.println("Sub message");
                System.out.println("Topic : " + s);
                System.out.println(new String(mqttMessage.getPayload())); //打印输出消息payLoad
                // 订阅到消息后即刻汇报
                System.out.println("收到云端下发指令后向平台上行消息");
                mqttClient.publish(pubTopic, new MqttMessage((new String(mqttMessage.getPayload())).getBytes("utf-8")));
            }

            @Override
            public void deliveryComplete(IMqttDeliveryToken iMqttDeliveryToken) {

            }
        });

    }

    /**
     * 初始化 Client 对象
     */
    private static void initAliyunIoTClient() {

        try {
            // 构造连接需要的参数
            String clientId = "java" + System.currentTimeMillis();
            Map<String, String> params = new HashMap<>(16);
            params.put("productKey", productKey);
            params.put("deviceName", deviceName);
            params.put("clientId", clientId);
            String timestamp = String.valueOf(System.currentTimeMillis());
            params.put("timestamp", timestamp);
            // cn-shanghai
            String targetServer = "tcp://" + productKey + ".iot-as-mqtt."+regionId+".aliyuncs.com:1883";

            String mqttclientId = clientId + "|securemode=3,signmethod=hmacsha1,timestamp=" + timestamp + "|";
            String mqttUsername = deviceName + "&" + productKey;
            String mqttPassword = AliyunIoTSignUtil.sign(params, deviceSecret, "hmacsha1");

            connectMqtt(targetServer, mqttclientId, mqttUsername, mqttPassword);

        } catch (Exception e) {
            System.out.println("initAliyunIoTClient error " + e.getMessage());
        }
    }

    public static void connectMqtt(String url, String clientId, String mqttUsername, String mqttPassword) throws Exception {

        MemoryPersistence persistence = new MemoryPersistence();
        mqttClient = new MqttClient(url, clientId, persistence);
        MqttConnectOptions connOpts = new MqttConnectOptions();
        // MQTT 3.1.1
        connOpts.setMqttVersion(4);
        connOpts.setAutomaticReconnect(true);
//        connOpts.setCleanSession(true);
        connOpts.setCleanSession(false);

        connOpts.setUserName(mqttUsername);
        connOpts.setPassword(mqttPassword.toCharArray());
        connOpts.setKeepAliveInterval(60);

        mqttClient.connect(connOpts);
    }

    /**
     * 汇报属性
     */
    private static void postDeviceProperties() {

        try {
            //上报数据
            //高级版 物模型-属性上报payload
            System.out.println("上报属性值");
            String payloadJson = "{\"params\":{\"LightSwitch\":1}}";
            MqttMessage message = new MqttMessage(payloadJson.getBytes("utf-8"));
            message.setQos(0);
            mqttClient.publish(pubTopic, message);
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }
}

1.3 设备状态查看

2、IoT Studio中进行产品和设备绑定，完整服务开发模块搭建

• 2.1 绑定产品和设备

2.2 创建服务开发

2.3 钉钉机器人Webhook获取

• 2.4 部署启动定时任务

3 测试效果

• 3.1 钉钉群消息

• 3.2 程序运行日志

Sub message
Topic : /sys/a1Agp******/LightDevice1/thing/service/property/set
{"method":"thing.service.property.set","id":"50505571","params":{"LightSwitch":0},"version":"1.0.0"}
收到云端下发指令后向平台上行消息

参考链接

什么是IoT Studio
定时关灯