概述
使用物联网平台规则引擎的数据流转功能，可将Topic中的数据消息转发至其他Topic或其他阿里云产品进行存储或处理。本文主要演示通过规则引擎将设备上行消息流转到函数计算，并通过函数计算发送消息到钉钉机器人。
Step By Step
产品及设备准备
1、创建产品
2、定义物模型
3、添加设备
4、使用SDK 上行消息，参考链接：基于开源JAVA MQTT Client连接阿里云IoT
import com.alibaba.taro.AliyunIoTSignUtil;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
import org.eclipse.paho.client.mqttv3.*;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
public class IoTDemoPubSubDemo {
// 设备三元组信息
public static String productKey = "a16MX********";
public static String deviceName = "device1";
public static String deviceSecret = "YGLHxUr40E1JaWhk3IVAm0uk********";
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";
// 自定义topic，在产品Topic列表位置定义
private static String subTopic = "/sys/" + productKey + "/" + deviceName + "/thing/event/property/post_reply";
private static MqttClient mqttClient;
public static void main(String [] args){
initAliyunIoTClient();
ScheduledExecutorService scheduledThreadPool = new ScheduledThreadPoolExecutor(1,
new ThreadFactoryBuilder().setNameFormat("thread-runner-%d").build());
scheduledThreadPool.scheduleAtFixedRate(()->postDeviceProperties(), 10,5, TimeUnit.SECONDS);
try {
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
}
@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(false);
// 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\":{\"CurrentTemperature\":13,\"Humidity\":10}}";
MqttMessage message = new MqttMessage(payloadJson.getBytes("utf-8"));
message.setQos(1);
mqttClient.publish(pubTopic, message);
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
}5、运行状态查看
函数计算创建与配置
1、创建应用
2、应用下面添加函数
3、编辑脚本
const https = require('https');
const accessToken = '填写accessToken，即钉钉机器人webhook的accessToken';
module.exports.handler = function(event, context, callback) {
var eventJson = JSON.parse(event.toString());
console.log(event.toString());
//钉钉消息格式
const postData = JSON.stringify({
"msgtype": "markdown",
"markdown": {
"title": "设备温湿度传感器",
"text": "#### 温湿度传感器上报\n" +
"> 设备名称：" + eventJson.deviceName+ "\n\n" +
"> 实时温度：" + eventJson.Temperature + "℃\n\n" +
"> 相对湿度：" + eventJson.Humidity + "%\n\n" +
"> ###### " + eventJson.time + " 发布 by [物联网平台](https://www.aliyun.com/product/iot) \n"
},
"at": {
"isAtAll": false
}
});
const options = {
hostname: 'oapi.dingtalk.com',
port: 443,
path: '/robot/send?access_token=' + accessToken,
method: 'POST',
headers: {
'Content-Type': 'application/json',
'Content-Length': Buffer.byteLength(postData)
}
};
const req = https.request(options, (res) => {
res.setEncoding('utf8');
res.on('data', (chunk) => {});
res.on('end', () => {
callback(null, 'success');
});
});
// 异常返回
req.on('error', (e) => {
callback(e);
});
// 写入数据
req.write(postData);
req.end();
};钉钉机器人webhook的accessToken获取参考链接：阿里云IoT Studio服务开发定时关灯功能示例Demo: 2.3 钉钉机器人Webhook获取 部分。
4、快速测试
规则引擎配置
1、创建规则引擎
2、配置处理数据
SQL字段
deviceName() as deviceName, items.Humidity.value as Humidity, items.CurrentTemperature.value as Temperature, timestamp('yyyy-MM-dd HH:mm:ss') as time3、配置转发数据
4、启动设备端SDK，周期性上行消息，钉钉群查看通知
5、上行日志查看