无法使用mqtt在Thingsboard中发布多个遥测值实例

Question

我正在尝试使用MQTT以1秒的间隔将一些遥测值发布到物联网。

下面的以下Java代码在运行时有效，并反映在我的Thingsboard仪表板上。但是，当我尝试从另一个实例发布时（例如，使用mosquito命令行工具启动另一个实例），程序停止运行并在Java控制台中生成错误日志，指出“客户端未连接（32104）”

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.eclipse.paho.client.mqttv3.*;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;

import java.nio.charset.StandardCharsets;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

public class MqttThingsBoard{

    public static final ObjectMapper MAPPER = new ObjectMapper();

    private String deviceToken;
    private String clientId;
    private MqttClientPersistence persistence;
    private MqttAsyncClient client;

    public MqttThingsBoard(String uri, String deviceToken) throws Exception {
        this.clientId = MqttAsyncClient.generateClientId();
        this.deviceToken = deviceToken;
        this.persistence = new MemoryPersistence();
        this.client = new MqttAsyncClient(uri, clientId, persistence);
    }

    public boolean connect() throws Exception {
        MqttConnectOptions options = new MqttConnectOptions();
        options.setUserName(deviceToken);
        try {
            client.connect(options, null, new IMqttActionListener() {
                @Override
                public void onSuccess(IMqttToken iMqttToken) {
                    System.out.println(" Connected to Thingsboard!");
                    Runnable helloRunnable = new Runnable() {
                        public void run() {
                            try {
                                publishTelemetry(MAPPER.readTree("{\"temperature\": 10}"));
                            } catch (Exception e) {
                                e.printStackTrace();
                            }
                        }
                    };

                    ScheduledExecutorService executor = Executors.newScheduledThreadPool(1);
                    executor.scheduleAtFixedRate(helloRunnable, 0, 1, TimeUnit.SECONDS);
                }

                @Override
                public void onFailure(IMqttToken iMqttToken, Throwable e) {
                     System.out.println("Failed to connect to Thingsboard!");
                }
            }).waitForCompletion();
        } catch (MqttException e) {
            System.out.println("Failed to connect to the server");
        }
        return client.isConnected();
    }

    public void disconnect() throws Exception {
        client.disconnect().waitForCompletion();
    }

    public void publishAttributes(JsonNode data) throws Exception {
        publish("v1/devices/me/attributes", data);
    }

    public void publishTelemetry(JsonNode data) throws Exception {
        publish("v1/devices/me/telemetry", data);
    }

    private void publish(String topic, JsonNode data) throws Exception {
        MqttMessage msg = new MqttMessage(MAPPER.writeValueAsString(data).getBytes(StandardCharsets.UTF_8));
        client.publish(topic, msg, null, new IMqttActionListener() {
            @Override
            public void onSuccess(IMqttToken asyncActionToken) {
                 System.out.println("Data updated!");
            }

            @Override
            public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
                 System.out.println("Data update failed!");
            }
        });

    }


}