Скачать или смотреть How to connect with MQTT Broker and publish a MQTT Message and Subscribe in Android Studio Java App

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dependencies {
implementation 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.2.0'
}

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 MqttHandler {

private MqttClient client;

public void connect(String brokerUrl, String clientId) {
try {
// Set up the persistence layer
MemoryPersistence persistence = new MemoryPersistence();

// Initialize the MQTT client
client = new MqttClient(brokerUrl, clientId, persistence);

// Set up the connection options
MqttConnectOptions connectOptions = new MqttConnectOptions();
connectOptions.setCleanSession(true);

// Connect to the broker
client.connect(connectOptions);
} catch (MqttException e) {
e.printStackTrace();
}
}

public void disconnect() {
try {
client.disconnect();
} catch (MqttException e) {
e.printStackTrace();
}
}

public void publish(String topic, String message) {
try {
MqttMessage mqttMessage = new MqttMessage(message.getBytes());
client.publish(topic, mqttMessage);
} catch (MqttException e) {
e.printStackTrace();
}
}

public void subscribe(String topic) {
try {
client.subscribe(topic);
} catch (MqttException e) {
e.printStackTrace();
}
}
}