关于MQTT以及EMQ方面JAVA使用依赖版本不同是否导致响应时间

Question

依赖org.eclipse.paho.client.mqttv3如果使用1.2.0响应时间50ms附近,1.2.1及以后的版本都为300ms以上,求解答

环境CentOS docker, emqx/emqx-ee:4.2.2 默认配置

JAVA部分使用EMQ官方提供的Paho Java

https://docs.emqx.cn/broker/v4.3/development/java.html#%E9%80%9A%E8%BF%87-maven-%E5%AE%89%E8%A3%85-paho-java

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.7.RELEASE</version>
    </parent>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.eclipse.paho</groupId>
            <artifactId>org.eclipse.paho.client.mqttv3</artifactId>
            <version>1.2.1</version>
        </dependency>
    </dependencies>

@RestController
@RequestMapping("/send")
public class SendController {

    @RequestMapping("/message")
    public Map sendMessage(){
        String subTopic = "testtopic/#";
        String pubTopic = "testtopic/1";
        String content = "Hello World";
        int qos = 2;
        String broker = "tcp://192.168.8.128:1883";
        String clientId = UUID.randomUUID().toString();
        MemoryPersistence persistence = new MemoryPersistence();

        try {
            MqttClient client = new MqttClient(broker, clientId, persistence);

            // MQTT 连接选项
            MqttConnectOptions connOpts = new MqttConnectOptions();
            connOpts.setUserName("admin");
            connOpts.setPassword("public".toCharArray());
            // 保留会话
            connOpts.setCleanSession(true);

            // 设置回调
            client.setCallback(new OnMessageCallback());

            // 建立连接
            System.out.println("Connecting to broker: " + broker);
            client.connect(connOpts);

            System.out.println("Connected");
            System.out.println("Publishing message: " + content);

            // 订阅
            //client.subscribe(subTopic);

            // 消息发布所需参数
            MqttMessage message = new MqttMessage(content.getBytes());
            message.setQos(qos);
            client.publish(pubTopic, message);
            System.out.println("Message published");

            client.disconnect();
            System.out.println("Disconnected");
            client.close();
            //System.exit(0);
        } catch (MqttException me) {
            System.out.println("reason " + me.getReasonCode());
            System.out.println("msg " + me.getMessage());
            System.out.println("loc " + me.getLocalizedMessage());
            System.out.println("cause " + me.getCause());
            System.out.println("excep " + me);
            me.printStackTrace();
        }
        return new HashMap();
    }

}

public class OnMessageCallback implements MqttCallback {
    public void connectionLost(Throwable cause) {
        // 连接丢失后，一般在这里面进行重连
        System.out.println("连接断开，可以做重连");
    }
    @Override
    public void messageArrived(String topic, MqttMessage message) throws Exception {
        // subscribe后得到的消息会执行到这里面
        System.out.println("接收消息主题:" + topic);
        System.out.println("接收消息Qos:" + message.getQos());
        System.out.println("接收消息内容:" + new String(message.getPayload()));
    }
    @Override
    public void deliveryComplete(IMqttDeliveryToken token) {
        System.out.println("deliveryComplete---------" + token.isComplete());
    }
}

 

Answer 1

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