概述

M2M（即Machine-to-Machine）是一种端对端通信技术。本章节以Node JS SDK为例，使用基于Topic消息路由的M2M设备间通信，主要介绍如何基于物联网平台构建一个M2M设备间通信架构。

实验步骤

第一部分：配置相关

1、产品、设备、Topic的创建参考链接

消息路由建立

本部分目前不支持门户直接配置，需要基于管理API: CreateTopicRouteTable 来建立消息路由关系。

测试可以直接使用OpenAPI来快速实现相关功能，本地集成相关功能直接基于SDK即可。

2、JAVA SDK Demo

import com.aliyuncs.DefaultAcsClient;
import com.aliyuncs.IAcsClient;
import com.aliyuncs.exceptions.ClientException;
import com.aliyuncs.exceptions.ServerException;
import com.aliyuncs.iot.model.v20170420.CreateTopicRouteTableRequest;
import com.aliyuncs.iot.model.v20170420.CreateTopicRouteTableResponse;
import com.aliyuncs.profile.DefaultProfile;
import com.google.gson.Gson;
import java.util.*;

public class CreateTopicRouteTable {

    public static void main(String[] args) {
        DefaultProfile profile = DefaultProfile.getProfile("cn-shanghai", "LTAIOZZg********", "v7CjUJCMk7j9aKduMAQLjy********");
        IAcsClient client = new DefaultAcsClient(profile);

        CreateTopicRouteTableRequest request = new CreateTopicRouteTableRequest();
        request.setRegionId("cn-shanghai");

        List<String> dstTopicList = new ArrayList<String>();
        dstTopicList.add("/a12OcQ4****/device2/user/RouteData");
        request.setDstTopics(dstTopicList);
        request.setSrcTopic("/a12OcQ4****/device1/user/RouteData");

        try {
            CreateTopicRouteTableResponse response = client.getAcsResponse(request);
            System.out.println(new Gson().toJson(response));
        } catch (ServerException e) {
            e.printStackTrace();
        } catch (ClientException e) {
            System.out.println("ErrCode:" + e.getErrCode());
            System.out.println("ErrMsg:" + e.getErrMsg());
            System.out.println("RequestId:" + e.getRequestId());
        }
    }
}

注意：SDK版本差异按照实际版本调整即可。

3、查询路由关系

import com.aliyuncs.DefaultAcsClient;
import com.aliyuncs.IAcsClient;
import com.aliyuncs.exceptions.ClientException;
import com.aliyuncs.exceptions.ServerException;
import com.aliyuncs.iot.model.v20170420.QueryTopicRouteTableRequest;
import com.aliyuncs.iot.model.v20170420.QueryTopicRouteTableResponse;
import com.aliyuncs.profile.DefaultProfile;
import com.google.gson.Gson;

public class QueryTopicRouteTable {

    public static void main(String[] args) {
        DefaultProfile profile = DefaultProfile.getProfile("cn-shanghai", "LTAIOZZgY********", "v7CjUJCMk7j9aKduMAQLjy********");
        IAcsClient client = new DefaultAcsClient(profile);

        QueryTopicRouteTableRequest request = new QueryTopicRouteTableRequest();
        request.setRegionId("cn-shanghai");
        request.setTopic("/a12OcQ4****/device1/user/RouteData");

        try {
            QueryTopicRouteTableResponse response = client.getAcsResponse(request);
            System.out.println(new Gson().toJson(response));
        } catch (ServerException e) {
            e.printStackTrace();
        } catch (ClientException e) {
            System.out.println("ErrCode:" + e.getErrCode());
            System.out.println("ErrMsg:" + e.getErrMsg());
            System.out.println("RequestId:" + e.getRequestId());
        }
    }
}

运行结果

{"requestId":"9404FD71-7461-478E-B064-0AEB15C91111","success":true,"dstTopics":["/a12OcQ4****/device2/user/RouteData"]}

第二部分：客户端代码相关

4、Node JS SDK安装参考链接

5、设备端业务代码

device1

// node引入包名
const iot = require('alibabacloud-iot-device-sdk');
// 浏览器、微信小程序，支付宝小程序引入./dist编译的js文件
// const iot = require('./dist/alibabacloud-iot-device-sdk.js');
// js版本下载地址：
//    https://github.com/aliyun/alibabacloud-iot-device-sdk/tree/master/dist  或
//    alibabacloud-iot-device-sdk.js 下载地址 https://unpkg.com/alibabacloud-iot-device-sdk@1.2.4/dist/alibabacloud-iot-device-sdk.js  或
//    alibabacloud-iot-device-sdk.min.js 下载地址 https://unpkg.com/alibabacloud-iot-device-sdk@1.2.4/dist/alibabacloud-iot-device-sdk.min.js  
//  

const device = iot.device({
  productKey: 'a12OcQ4****',
  deviceName: 'device1',
  deviceSecret: '3yWqKtWxN7VPuWEEDEn4eKWN********'
  // 支付宝小程序和微信小程序额外需要配置协议参数
  // "protocol": 'alis://', "protocol": 'wxs://',
});
device.on('connect', () => {
  console.log('connect successfully!');
  // 发送消息到指定的Topic，等待规则引擎转发到另外的一个设备的Topic
  device.publish('/a12OcQ4****/device1/user/RouteData', '{"ke1":"value1 test"}');
  device.publish('/a12OcQ4****/device1/user/RouteData', 'This is my test job.');
});

device2

// node引入包名
const iot = require('alibabacloud-iot-device-sdk');
// 浏览器、微信小程序，支付宝小程序引入./dist编译的js文件
// const iot = require('./dist/alibabacloud-iot-device-sdk.js');
// js版本下载地址：
//    https://github.com/aliyun/alibabacloud-iot-device-sdk/tree/master/dist  或
//    alibabacloud-iot-device-sdk.js 下载地址 https://unpkg.com/alibabacloud-iot-device-sdk@1.2.4/dist/alibabacloud-iot-device-sdk.js  或
//    alibabacloud-iot-device-sdk.min.js 下载地址 https://unpkg.com/alibabacloud-iot-device-sdk@1.2.4/dist/alibabacloud-iot-device-sdk.min.js  
//  

const device = iot.device({
  productKey: 'a12OcQ4****',
  deviceName: 'device2',
  deviceSecret: 'X9fzX9u0aIOORNghPyfYKq22********'
  // 支付宝小程序和微信小程序额外需要配置协议参数
  // "protocol": 'alis://', "protocol": 'wxs://',
});
// 定于规则引擎转发过来的消息
device.subscribe('/a12OcQ4****/device2/user/RouteData');
device.on('connect', () => {
  console.log('connect successfully!');
});
device.on('message', (topic, payload) => {
  console.log(topic, payload.toString());
});

8、测试运行

参考链接

基于Topic消息路由的M2M设备间通信