阿里云学习之IOT物联网套件（客户端与服务端的后台数据传输）

设备端代码（mqttClient）：https://help.aliyun.com/document_detail/42648.html?spm=5176.doc30579.6.569.ZEgA1g

服务端代码（aliyun-java-sdk-iot）：https://help.aliyun.com/document_detail/30579.html?spm=5176.doc42693.6.597.WhnZQa

消息代码（aliyun-sdk-mns-samples）：https://help.aliyun.com/document_detail/27508.html?spm=5176.doc27509.6.648.9hGlrb

https://help.aliyun.com/document_detail/42693.html?spm=5176.doc50633.6.573.wlKHyi

https://help.aliyun.com/document_detail/27509.html?spm=5176.product27412.6.652.uIO9HW

一、设备端发送消息到服务端流程

　　1、终端发送消息到物联网套件

　　　　SimpleClient4IOT/connectMqtt：sampleClient.publish(pubTopic,message);

　　　　 String content = "客户端发送消息到服务端";
        MqttMessage message = new MqttMessage(content.getBytes("utf-8"));
        message.setQos(0);//消息qos 0:最多一次，1:至少一次
        sampleClient.publish(pubTopic, message);//发送数据到某个topic
        System.out.println("发送消息成功");

　　2、物联网套件发送消息到消息服务

　　　　通过上一篇 阿里云学习之IOT物联网套件（配置篇），讲解物联网套件和消息服务的具体配置流程和走向

　　　　规则引擎——>主题——>订阅——>队列

　　3、消息服务发送消息到服务端，服务端接收消息

　　　　ComsumerDemo/main：queue.popMessage();

　　　　　　　 MNSClient client = account.getMNSClient(); //this client need only initialize once
            CloudQueue queue = client.getQueueRef("aliyun-iot-UGlr70uPYVM");// replace with your queue name
            System.out.println("开始调试...");
            for (int i = 0; i < 20; i++)
            {
                Message popMsg = queue.popMessage();
                System.out.println("消息为空...");
                if (popMsg != null){
                    System.out.println("message handle: " + popMsg.getReceiptHandle());
                    System.out.println("message body: " + popMsg.getMessageBodyAsString());
                    System.out.println("message id: " + popMsg.getMessageId());
                    System.out.println("message dequeue count:" + popMsg.getDequeueCount());
                    //<<to add your special logic.>>
                    
                    //remember to  delete message when consume message successfully.
                    queue.deleteMessage(popMsg.getReceiptHandle());
                    System.out.println("delete message successfully.
");
                }
            }

二、服务端发送消息到设备端流程

　　1、服务端发送消息到物联网套件

　　　　 String accessKey = "账号key";
        String accessSecret = "账号Secret";
        try {
            DefaultProfile.addEndpoint("cn-shanghai", "cn-shanghai", "Iot", "iot.cn-shanghai.aliyuncs.com");
        } catch (ClientException e) {
            e.printStackTrace();
        }
        IClientProfile profile = DefaultProfile.getProfile("cn-shanghai", accessKey, accessSecret);
        DefaultAcsClient client = new DefaultAcsClient(profile); //初始化SDK客户端
        
        PubRequest request = new PubRequest();
        request.setProductKey("产品key");
        request.setMessageContent(Base64.encodeBase64String("消息服务".getBytes()));
        request.setTopicFullName("topic");// /UGlr70uPYVM/bulb/get

　　　　 request.setQos(0); //目前支持QoS0和QoS1  PubResponse response; try { response = client.getAcsResponse(request); System.out.println(response.getSuccess()); System.out.println(response.getErrorMessage()); } catch (ServerException e) { e.printStackTrace(); } catch (ClientException e) { e.printStackTrace(); }

　　　　2、设备端接收消息

　　　　　　  sampleClient.setCallback(new MqttCallback() {
            @Override
            /*public void connectionLost(Throwable cause) {
                LogUtil.print("连接失败,原因:" + cause);
                cause.printStackTrace();
            }*/

            @Override
            public void messageArrived(String topic, MqttMessage message) throws Exception {
                LogUtil.print("接收到消息,来至Topic [" + topic + "] , 内容是:["
                    + new String(message.getPayload(), "UTF-8") + "],  ");
            }

            @Override
            /*public void deliveryComplete(IMqttDeliveryToken token) {
                //如果是QoS0的消息，token.resp是没有回复的
                LogUtil.print("消息发送成功! " + ((token == null || token.getResponse() == null) ? "null"
                    : token.getResponse().getKey()));
            }*/
        });