<dependency>
    <groupId>org.eclipse.paho</groupId>
	<artifactId>org.eclipse.paho.client.mqttv3</artifactId>
	<version>1.2.5</version>
</dependency>

import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.util.List;
import java.util.concurrent.TimeUnit;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import org.eclipse.paho.mqttv5.client.IMqttToken;
import org.eclipse.paho.mqttv5.client.MqttCallback;
import org.eclipse.paho.mqttv5.client.MqttClient;
import org.eclipse.paho.mqttv5.client.MqttConnectionOptions;
import org.eclipse.paho.mqttv5.client.MqttDisconnectResponse;
import org.eclipse.paho.mqttv5.client.persist.MemoryPersistence;
import org.eclipse.paho.mqttv5.common.MqttException;
import org.eclipse.paho.mqttv5.common.MqttMessage;
import org.eclipse.paho.mqttv5.common.packet.MqttProperties;
import org.eclipse.paho.mqttv5.common.packet.UserProperty;

public class QuickStartTls {

    public static SSLSocketFactory buildSSLSocketFactory() throws NoSuchAlgorithmException, KeyManagementException {
        SSLContext ctx = SSLContext.getInstance("TLS");
        ctx.init(null, null, null);
        return ctx.getSocketFactory();
    }

    public static void main(String[] args) throws Exception {
        // Get the access point from the MQTT console:
        // For users implementing VPC connectivity via Private Link, use the private network access point.
        // For users accessing over the public network, ensure the public network security policy permits access, and the machine running the program has public network connectivity.
        String serverUri = "ssl://mqtt-xxx.mqtt.tencenttdmq.com:8883";

        // A valid client identifier contains digits 0–9, lowercase letters a–z, and uppercase letters A–Z, with a total length of 1–23 characters.
        // See https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901059.
        String clientId = "QuickStartTls";

        // In the console, on the Authentication tab, create an account and copy the username and password.
        String username = "YOUR_USERNAME";
        String password = "YOUR_PASSWORD";

        // MQTT topic
        String topicName = "home/test";
        String[] topicFilters = new String[]{topicName, "home/#", "home/+"};
        int[] qos = new int[]{1, 1, 1};

        int total = 16;

        MqttClient client = new MqttClient(serverUri, clientId, new MemoryPersistence());
        client.setTimeToWait(3000);
        MqttConnectionOptions options = new MqttConnectionOptions();
        options.setSocketFactory(buildSSLSocketFactory());
        options.setHttpsHostnameVerificationEnabled(false);
        options.setUserName(username);
        options.setPassword(password.getBytes(StandardCharsets.UTF_8));
        options.setCleanStart(true);
        options.setAutomaticReconnect(true);

        client.setCallback(new MqttCallback() {
            @Override
            public void disconnected(MqttDisconnectResponse response) {
                System.out.println("Disconnected: " + response.getReasonString());
            }

            @Override
            public void mqttErrorOccurred(MqttException e) {
                e.printStackTrace();
            }

            @Override
            public void messageArrived(String topic, MqttMessage message) throws Exception {
                byte[] payload = message.getPayload();
                String content;
                if (4 == payload.length) {
                    ByteBuffer buf = ByteBuffer.wrap(payload);
                    content = String.valueOf(buf.getInt());
                } else {
                    content = new String(payload, StandardCharsets.UTF_8);
                }
                System.out.printf("Message arrived, topic=%s, QoS=%d content=[%s]%n",
                    topic, message.getQos(), content);
            }

            @Override
            public void deliveryComplete(IMqttToken token) {

            }

            @Override
            public void connectComplete(boolean reconnect, String serverURI) {
                System.out.println(reconnect ? "Reconnected" : "Connected" + " to " + serverURI);
                try {
                    // Subscribe
                    IMqttToken token = client.subscribe(topicFilters, qos);
                    int[] reasonCodes = token.getReasonCodes();
                    for (int i = 0; i < reasonCodes.length; i++) {
                        System.out.printf("Subscribed to topic %s with QoS=%d, Granted-QoS: %d%n",
                            topicFilters[i], qos[i], reasonCodes[i]);
                    }

                    if (token.isComplete()) {
                        List<UserProperty> userProperties = token.getResponseProperties().getUserProperties();
                        printUserProperties(userProperties);
                    }
                } catch (MqttException e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void authPacketArrived(int i, MqttProperties properties) {
            }
        });

        client.connect(options);

        for (int i = 0; i < total; i++) {
            String msg = "Hello MQTT " + i;
            MqttMessage message = new MqttMessage(msg.getBytes(StandardCharsets.UTF_8));
            message.setQos(1);
            System.out.printf("Prepare to publish message %d%n", i);
            client.publish(topicName, message);
            System.out.printf("Published message %d%n", i);
            TimeUnit.SECONDS.sleep(3);
        }
        TimeUnit.SECONDS.sleep(3);

        client.disconnect();
    }

    static void printUserProperties(List<UserProperty> userProperties) {
        if (null != userProperties) {
            for (UserProperty userProperty : userProperties) {
                System.out.printf("User property: %s = %s%n", userProperty.getKey(), userProperty.getValue());
            }
        }
    }
}



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

import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttCallbackExtended;
import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;

public class QuickStart {
    public static void main(String[] args) throws MqttException, InterruptedException {
        // Get the access point from the MQTT console:
        // For users implementing VPC connectivity via Private Link, use the private network access point.
        // For users accessing over the public network, ensure the public network security policy permits access, and the machine running the program has public network connectivity.
        String serverUri = "tcp://mqtt-xxx.mqtt.tencenttdmq.com:1883";

        // A valid client identifier contains digits 0–9, lowercase letters a–z, and uppercase letters A–Z, with a total length of 1–23 characters.
        // See https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901059.
        String clientId = "QuickStart";

        // In the console, on the Authentication tab, create an account and copy the username and password.
        String username = "YOUR_USERNAME";
        String password = "YOUR_PASSWORD";

        // Ensure that the first-level topic "home" has been created in the MQTT console.
        String pubTopic = "home/test";
        String[] topicFilters = new String[]{pubTopic, "home/#", "home/+"};
        int[] qos = new int[]{1, 1, 1};

        int total = 16;

        try (MqttClient client = new MqttClient(serverUri, clientId, new MemoryPersistence())) {
            client.setTimeToWait(3000);
            MqttConnectOptions options = new MqttConnectOptions();
            options.setUserName(username);
            options.setPassword(password.toCharArray());
            options.setMqttVersion(MqttConnectOptions.MQTT_VERSION_3_1_1);
            options.setCleanSession(true);
            options.setAutomaticReconnect(true);

            MqttCallback callback = new MqttCallback(client, topicFilters, qos);
            client.setCallback(callback);

            client.connect(options);

            for (int i = 0; i < total; i++) {
                String msg = "Hello MQTT " + i;
                MqttMessage message = new MqttMessage(msg.getBytes(StandardCharsets.UTF_8));
                message.setQos(1);
                System.out.printf("Prepare to publish message %d%n", i);
                client.publish(pubTopic, message);
                System.out.printf("Published message %d%n", i);
                TimeUnit.SECONDS.sleep(3);
            }
            TimeUnit.SECONDS.sleep(3);

            client.disconnect();
        }
    }

    static class MqttCallback implements MqttCallbackExtended {

        private final MqttClient client;

        private final String[] topicFilters;
        private final int[] qos;

        public MqttCallback(MqttClient client, String[] topicFilters, int[] qos) {
            this.client = client;
            this.topicFilters = topicFilters;
            this.qos = qos;
        }

        public void messageArrived(String topic, MqttMessage message) {
            System.out.printf("Message arrived, topic=%s, QoS=%d, Dup=%s, Retained=%s, content=[%s]%n",
                    topic, message.getQos(), message.isDuplicate(), message.isRetained(),
                    new String(message.getPayload(), StandardCharsets.UTF_8));
        }

        public void connectionLost(Throwable cause) {
            System.out.println("connectionLost: " + cause.getMessage());
        }

        @Override
        public void connectComplete(boolean reconnect, String serverURI) {
            System.out.println(reconnect ? "Reconnected" : "Connected" + " to " + serverURI);
            try {
                client.subscribe(topicFilters, qos);
                System.out.printf("Subscribed %d topics%n", topicFilters.length);
            } catch (MqttException e) {
                e.printStackTrace();
            }
        }

        public void deliveryComplete(IMqttDeliveryToken token) {
            System.out.printf("Delivery completed: packet-id=%d%n", token.getMessageId());
        }
    }
}

import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttCallbackExtended;
import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;

import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import java.nio.charset.StandardCharsets;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.util.concurrent.TimeUnit;

public class QuickStartTls {

    public static SSLSocketFactory buildSSLSocketFactory() throws NoSuchAlgorithmException, KeyManagementException {
        SSLContext ctx = SSLContext.getInstance("TLS");
        ctx.init(null, null, null);
        return ctx.getSocketFactory();
    }

    public static void main(String[] args) throws MqttException, InterruptedException, NoSuchAlgorithmException, KeyManagementException {

        // Get the access point from the MQTT console:
        // For users implementing VPC connectivity via Private Link, use the private network access point.
        // For users accessing over the public network, ensure the public network security policy permits access, and the machine running the program has public network connectivity.
        String serverUri = "ssl://mqtt-xxxx.mqtt.tencenttdmq.com:8883";
        
        // A valid client identifier contains digits 0–9, lowercase letters a–z, and uppercase letters A–Z, with a total length of 1–23 characters.
        // See https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901059.
        String clientId = "ClientQuickStartTls";

        // In the console, on the Authentication tab, create an account and copy the username and password.
        String username = "YOUR_USERNAME";
        String password = "YOUR_PASSWORD";

        // Ensure that the first-level topic "home" has been created in the MQTT console.
        String topic = "home/test";

        String[] topicFilters = new String[]{"home/test"};
        int[] qos = new int[]{1};

        int total = 16;

        try (MqttClient client = new MqttClient(serverUri, clientId, new MemoryPersistence())) {
            client.setTimeToWait(3000);
            MqttConnectOptions options = new MqttConnectOptions();
            options.setUserName(username);
            options.setPassword(password.toCharArray());
            options.setSocketFactory(buildSSLSocketFactory());
            options.setHttpsHostnameVerificationEnabled(false);
            options.setMqttVersion(MqttConnectOptions.MQTT_VERSION_3_1_1);
            options.setCleanSession(true);
            options.setAutomaticReconnect(true);
            client.connect(options);

            client.setCallback(new MqttCallback(client, topicFilters, qos));

            for (int i = 0; i < total; i++) {
                String msg = "Hello MQTT " + i;
                MqttMessage message = new MqttMessage(msg.getBytes());
                message.setQos(1);
                System.out.printf("Prepare to publish message %d%n", i);
                client.publish(topic, message);
                System.out.printf("Published message %d%n", i);
                TimeUnit.SECONDS.sleep(1);
            }

            TimeUnit.SECONDS.sleep(3);

            client.disconnect();
        }
    }

    static class MqttCallback implements MqttCallbackExtended {

        private final MqttClient client;

        private final String[] topicFilters;
        private final int[] qos;

        public MqttCallback(MqttClient client, String[] topicFilters, int[] qos) {
            this.client = client;
            this.topicFilters = topicFilters;
            this.qos = qos;
        }

        public void messageArrived(String topic, MqttMessage message) {
            System.out.printf("Message arrived, topic=%s, QoS=%d content=[%s]%n", topic, message.getQos(),
                    new String(message.getPayload(), StandardCharsets.UTF_8));
        }

        public void connectionLost(Throwable cause) {
            System.out.println("connectionLost: " + cause.getMessage());
        }

        @Override
        public void connectComplete(boolean reconnect, String serverURI) {
            System.out.println(reconnect ? "Reconnected" : "Connect" + serverURI);
            try {
                client.subscribe(topicFilters, qos);
                System.out.printf("Subscribed %d topics%n", topicFilters.length);
            } catch (MqttException e) {
                e.printStackTrace();
            }
        }

        public void deliveryComplete(IMqttDeliveryToken token) {
            System.out.printf("Delivery completed: packet-id=%d%n", token.getMessageId());
        }
    }
}