
/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.activemq.artemis.tests.integration.mqtt.imported;

import javax.jms.BytesMessage;
import javax.jms.Connection;
import javax.jms.Destination;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;
import java.lang.reflect.Field;
import java.net.ProtocolException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.regex.Pattern;

import org.apache.activemq.artemis.api.core.SimpleString;
import org.apache.activemq.artemis.core.protocol.mqtt.MQTTConnectionManager;
import org.apache.activemq.artemis.core.protocol.mqtt.MQTTSession;
import org.apache.activemq.artemis.tests.integration.mqtt.imported.util.Wait;
import org.apache.activemq.artemis.utils.ConcurrentHashSet;
import org.fusesource.mqtt.client.BlockingConnection;
import org.fusesource.mqtt.client.MQTT;
import org.fusesource.mqtt.client.MQTTException;
import org.fusesource.mqtt.client.Message;
import org.fusesource.mqtt.client.QoS;
import org.fusesource.mqtt.client.Topic;
import org.fusesource.mqtt.client.Tracer;
import org.fusesource.mqtt.codec.MQTTFrame;
import org.fusesource.mqtt.codec.PUBLISH;
import org.junit.Before;
import org.junit.Ignore;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * QT
 * MQTT Test imported from ActiveMQ MQTT component.
 */
public class MQTTTest extends MQTTTestSupport {

   private static final Logger LOG = LoggerFactory.getLogger(MQTTTest.class);

   private static final int NUM_MESSAGES = 250;

   @Override
   @Before
   public void setUp() throws Exception {
      Field sessions = MQTTSession.class.getDeclaredField("SESSIONS");
      sessions.setAccessible(true);
      sessions.set(null, new ConcurrentHashMap<>());

      Field connectedClients = MQTTConnectionManager.class.getDeclaredField("CONNECTED_CLIENTS");
      connectedClients.setAccessible(true);
      connectedClients.set(null, new ConcurrentHashSet<>());
      super.setUp();

   }

   @Test(timeout = 60 * 1000)
   public void testSendAndReceiveMQTT() throws Exception {
      final MQTTClientProvider subscriptionProvider = getMQTTClientProvider();
      initializeConnection(subscriptionProvider);

      subscriptionProvider.subscribe("foo/bah", AT_MOST_ONCE);

      final CountDownLatch latch = new CountDownLatch(NUM_MESSAGES);

      Thread thread = new Thread(new Runnable() {
         @Override
         public void run() {
            for (int i = 0; i < NUM_MESSAGES; i++) {
               try {
                  byte[] payload = subscriptionProvider.receive(10000);
                  assertNotNull("Should get a message", payload);
                  latch.countDown();
               } catch (Exception e) {
                  e.printStackTrace();
                  break;
               }

            }
         }
      });
      thread.start();

      final MQTTClientProvider publishProvider = getMQTTClientProvider();
      initializeConnection(publishProvider);

      for (int i = 0; i < NUM_MESSAGES; i++) {
         String payload = "Message " + i;
         publishProvider.publish("foo/bah", payload.getBytes(), AT_LEAST_ONCE);
      }

      latch.await(10, TimeUnit.SECONDS);
      assertEquals(0, latch.getCount());
      subscriptionProvider.disconnect();
      publishProvider.disconnect();
   }

   @Test(timeout = 60 * 1000)
   public void testUnsubscribeMQTT() throws Exception {
      final MQTTClientProvider subscriptionProvider = getMQTTClientProvider();
      initializeConnection(subscriptionProvider);

      String topic = "foo/bah";

      subscriptionProvider.subscribe(topic, AT_MOST_ONCE);

      final CountDownLatch latch = new CountDownLatch(NUM_MESSAGES / 2);

      Thread thread = new Thread(new Runnable() {
         @Override
         public void run() {
            for (int i = 0; i < NUM_MESSAGES; i++) {
               try {
                  byte[] payload = subscriptionProvider.receive(10000);
                  assertNotNull("Should get a message", payload);
                  latch.countDown();
               } catch (Exception e) {
                  e.printStackTrace();
                  break;
               }

            }
         }
      });
      thread.start();

      final MQTTClientProvider publishProvider = getMQTTClientProvider();
      initializeConnection(publishProvider);

      for (int i = 0; i < NUM_MESSAGES; i++) {
         String payload = "Message " + i;
         if (i == NUM_MESSAGES / 2) {
            subscriptionProvider.unsubscribe(topic);
         }
         publishProvider.publish(topic, payload.getBytes(), AT_LEAST_ONCE);
      }

      latch.await(20, TimeUnit.SECONDS);
      assertEquals(0, latch.getCount());
      subscriptionProvider.disconnect();
      publishProvider.disconnect();
   }

   @Test(timeout = 60 * 1000)
   public void testSendAtMostOnceReceiveExactlyOnce() throws Exception {
      /**
       * Although subscribing with EXACTLY ONCE, the message gets published
       * with AT_MOST_ONCE - in MQTT the QoS is always determined by the
       * message as published - not the wish of the subscriber
       */
      final MQTTClientProvider provider = getMQTTClientProvider();
      initializeConnection(provider);
      provider.subscribe("foo", EXACTLY_ONCE);
      for (int i = 0; i < NUM_MESSAGES; i++) {
         String payload = "Test Message: " + i;
         provider.publish("foo", payload.getBytes(), AT_MOST_ONCE);
         byte[] message = provider.receive(5000);
         assertNotNull("Should get a message", message);
         assertEquals(payload, new String(message));
      }
      provider.disconnect();
   }

   @Test(timeout = 2 * 60 * 1000)
   public void testSendAtLeastOnceReceiveExactlyOnce() throws Exception {
      final MQTTClientProvider provider = getMQTTClientProvider();
      initializeConnection(provider);
      provider.subscribe("foo", EXACTLY_ONCE);
      for (int i = 0; i < NUM_MESSAGES; i++) {
         String payload = "Test Message: " + i;
         provider.publish("foo", payload.getBytes(), AT_LEAST_ONCE);
         byte[] message = provider.receive(5000);
         assertNotNull("Should get a message", message);
         assertEquals(payload, new String(message));
      }
      provider.disconnect();
   }

   @Test(timeout = 2 * 60 * 1000)
   public void testSendAtLeastOnceReceiveAtMostOnce() throws Exception {
      final MQTTClientProvider provider = getMQTTClientProvider();
      initializeConnection(provider);
      provider.subscribe("foo", AT_MOST_ONCE);
      for (int i = 0; i < NUM_MESSAGES; i++) {
         String payload = "Test Message: " + i;
         provider.publish("foo", payload.getBytes(), AT_LEAST_ONCE);
         byte[] message = provider.receive(5000);
         assertNotNull("Should get a message", message);
         assertEquals(payload, new String(message));
      }
      provider.disconnect();
   }

   @Test(timeout = 60 * 1000)
   public void testSendAndReceiveAtMostOnce() throws Exception {
      final MQTTClientProvider provider = getMQTTClientProvider();
      initializeConnection(provider);
      provider.subscribe("foo", AT_MOST_ONCE);
      for (int i = 0; i < NUM_MESSAGES; i++) {
         String payload = "Test Message: " + i;
         provider.publish("foo", payload.getBytes(), AT_MOST_ONCE);
         byte[] message = provider.receive(5000);
         assertNotNull("Should get a message", message);
         assertEquals(payload, new String(message));
      }
      provider.disconnect();
   }

   @Test(timeout = 2 * 60 * 1000)
   public void testSendAndReceiveAtLeastOnce() throws Exception {
      final MQTTClientProvider provider = getMQTTClientProvider();
      initializeConnection(provider);
      provider.subscribe("foo", AT_LEAST_ONCE);
      for (int i = 0; i < NUM_MESSAGES; i++) {
         String payload = "Test Message: " + i;
         provider.publish("foo", payload.getBytes(), AT_LEAST_ONCE);
         byte[] message = provider.receive(5000);
         assertNotNull("Should get a message", message);
         assertEquals(payload, new String(message));
      }
      provider.disconnect();
   }

   @Test(timeout = 60 * 1000)
   public void testSendAndReceiveExactlyOnceWithInterceptors() throws Exception {
      MQTTIncomingInterceptor.clear();
      MQTTOutoingInterceptor.clear();
      final MQTTClientProvider publisher = getMQTTClientProvider();
      initializeConnection(publisher);

      final MQTTClientProvider subscriber = getMQTTClientProvider();
      initializeConnection(subscriber);

      subscriber.subscribe("foo", EXACTLY_ONCE);
      for (int i = 0; i < NUM_MESSAGES; i++) {
         String payload = "Test Message: " + i;
         publisher.publish("foo", payload.getBytes(), EXACTLY_ONCE);
         byte[] message = subscriber.receive(5000);
         assertNotNull("Should get a message + [" + i + "]", message);
         assertEquals(payload, new String(message));
      }
      subscriber.disconnect();
      publisher.disconnect();
      assertEquals(NUM_MESSAGES, MQTTIncomingInterceptor.getMessageCount());
      assertEquals(NUM_MESSAGES, MQTTOutoingInterceptor.getMessageCount());
   }

   @Ignore
   @Test(timeout = 600 * 1000)
   public void testSendMoreThanUniqueId() throws Exception {
      int messages = (Short.MAX_VALUE * 2) + 1;

      final MQTTClientProvider publisher = getMQTTClientProvider();
      initializeConnection(publisher);

      final MQTTClientProvider subscriber = getMQTTClientProvider();
      initializeConnection(subscriber);

      int count = 0;
      subscriber.subscribe("foo", EXACTLY_ONCE);
      for (int i = 0; i < messages; i++) {
         String payload = "Test Message: " + i;
         publisher.publish("foo", payload.getBytes(), EXACTLY_ONCE);
         byte[] message = subscriber.receive(5000);
         assertNotNull("Should get a message + [" + i + "]", message);
         assertEquals(payload, new String(message));
         count++;
      }

      assertEquals(messages, count);
      subscriber.disconnect();
      publisher.disconnect();
   }

   @Test(timeout = 60 * 1000)
   public void testSendAndReceiveLargeMessages() throws Exception {
      byte[] payload = new byte[1024 * 32];
      for (int i = 0; i < payload.length; i++) {
         payload[i] = '2';
      }
      final MQTTClientProvider publisher = getMQTTClientProvider();
      initializeConnection(publisher);

      final MQTTClientProvider subscriber = getMQTTClientProvider();
      initializeConnection(subscriber);

      subscriber.subscribe("foo", AT_LEAST_ONCE);
      for (int i = 0; i < 10; i++) {
         publisher.publish("foo", payload, AT_LEAST_ONCE);
         byte[] message = subscriber.receive(5000);
         assertNotNull("Should get a message", message);

         assertArrayEquals(payload, message);
      }
      subscriber.disconnect();
      publisher.disconnect();
   }

   @Test(timeout = 60 * 1000)
   public void testSendAndReceiveRetainedMessages() throws Exception {
      final MQTTClientProvider publisher = getMQTTClientProvider();
      initializeConnection(publisher);

      final MQTTClientProvider subscriber = getMQTTClientProvider();
      initializeConnection(subscriber);

      String RETAINED = "retained";
      publisher.publish("foo", RETAINED.getBytes(), AT_LEAST_ONCE, true);

      List<String> messages = new ArrayList<>();
      for (int i = 0; i < 10; i++) {
         messages.add("TEST MESSAGE:" + i);
      }

      subscriber.subscribe("foo", AT_LEAST_ONCE);

      for (int i = 0; i < 10; i++) {
         publisher.publish("foo", messages.get(i).getBytes(), AT_LEAST_ONCE);
      }
      byte[] msg = subscriber.receive(5000);
      assertNotNull(msg);
      assertEquals(RETAINED, new String(msg));

      for (int i = 0; i < 10; i++) {
         msg = subscriber.receive(5000);
         assertNotNull(msg);
         assertEquals(messages.get(i), new String(msg));
      }
      subscriber.disconnect();
      publisher.disconnect();
   }

   @Test(timeout = 30 * 1000)
   public void testValidZeroLengthClientId() throws Exception {
      MQTT mqtt = createMQTTConnection();
      mqtt.setClientId("");
      mqtt.setCleanSession(true);

      BlockingConnection connection = mqtt.blockingConnection();
      connection.connect();
      connection.disconnect();
   }

   @Test(timeout = 2 * 60 * 1000)
   public void testMQTTPathPatterns() throws Exception {
      MQTT mqtt = createMQTTConnection();
      mqtt.setClientId("");
      mqtt.setCleanSession(true);

      BlockingConnection connection = mqtt.blockingConnection();
      connection.connect();

      final String RETAINED = "RETAINED";
      String[] topics = {"TopicA", "/TopicA", "/", "TopicA/", "//"};
      for (String topic : topics) {
         // test retained message
         connection.publish(topic, (RETAINED + topic).getBytes(), QoS.AT_LEAST_ONCE, true);

         connection.subscribe(new Topic[]{new Topic(topic, QoS.AT_LEAST_ONCE)});
         Message msg = connection.receive(5, TimeUnit.SECONDS);
         assertNotNull("No message for " + topic, msg);
         assertEquals(RETAINED + topic, new String(msg.getPayload()));
         msg.ack();

         // test non-retained message
         connection.publish(topic, topic.getBytes(), QoS.AT_LEAST_ONCE, false);
         msg = connection.receive(1000, TimeUnit.MILLISECONDS);
         assertNotNull(msg);
         assertEquals(topic, new String(msg.getPayload()));
         msg.ack();

         connection.unsubscribe(new String[]{topic});
      }
      connection.disconnect();

      // test wildcard patterns with above topics
      String[] wildcards = {"#", "+", "+/#", "/+", "+/", "+/+", "+/+/", "+/+/+"};
      for (String wildcard : wildcards) {
         final Pattern pattern = Pattern.compile(wildcard.replaceAll("/?#", "(/?.*)*").replaceAll("\\+", "[^/]*"));

         connection = mqtt.blockingConnection();
         connection.connect();
         final byte[] qos = connection.subscribe(new Topic[]{new Topic(wildcard, QoS.AT_LEAST_ONCE)});
         assertNotEquals("Subscribe failed " + wildcard, (byte) 0x80, qos[0]);

         // test retained messages
         Message msg = connection.receive(5, TimeUnit.SECONDS);
         do {
            assertNotNull("RETAINED null " + wildcard, msg);
            String msgPayload = new String(msg.getPayload());
            assertTrue("RETAINED prefix " + wildcard + " msg " + msgPayload, msgPayload.startsWith(RETAINED));
            assertTrue("RETAINED matching " + wildcard + " " + msg.getTopic(), pattern.matcher(msg.getTopic()).matches());
            msg.ack();
            msg = connection.receive(5000, TimeUnit.MILLISECONDS);
         } while (msg != null);

         // test non-retained message
         for (String topic : topics) {
            connection.publish(topic, topic.getBytes(), QoS.AT_LEAST_ONCE, false);
         }
         msg = connection.receive(1000, TimeUnit.MILLISECONDS);
         do {
            assertNotNull("Non-retained Null " + wildcard, msg);
            assertTrue("Non-retained matching " + wildcard + " " + msg.getTopic(), pattern.matcher(msg.getTopic()).matches());
            msg.ack();
            msg = connection.receive(1000, TimeUnit.MILLISECONDS);
         } while (msg != null);

         connection.unsubscribe(new String[]{wildcard});
         connection.disconnect();
      }
   }

   @Test(timeout = 60 * 1000)
   public void testMQTTRetainQoS() throws Exception {
      String[] topics = {"AT_MOST_ONCE", "AT_LEAST_ONCE", "EXACTLY_ONCE"};
      for (int i = 0; i < topics.length; i++) {
         final String topic = topics[i];

         MQTT mqtt = createMQTTConnection();
         mqtt.setClientId("foo");
         mqtt.setKeepAlive((short) 2);

         final int[] actualQoS = {-1};
         mqtt.setTracer(new Tracer() {
            @Override
            public void onReceive(MQTTFrame frame) {
               // validate the QoS
               if (frame.messageType() == PUBLISH.TYPE) {
                  actualQoS[0] = frame.qos().ordinal();
               }
            }
         });

         final BlockingConnection connection = mqtt.blockingConnection();
         connection.connect();
         connection.publish(topic, topic.getBytes(), QoS.EXACTLY_ONCE, true);
         connection.subscribe(new Topic[]{new Topic(topic, QoS.valueOf(topic))});

         final Message msg = connection.receive(5000, TimeUnit.MILLISECONDS);
         assertNotNull(msg);
         assertEquals(topic, new String(msg.getPayload()));
         int waitCount = 0;
         while (actualQoS[0] == -1 && waitCount < 10) {
            Thread.sleep(1000);
            waitCount++;
         }
         assertEquals(i, actualQoS[0]);
         msg.ack();

         connection.unsubscribe(new String[]{topic});
         connection.disconnect();
      }

   }

   @Test(timeout = 60 * 1000)
   public void testDuplicateSubscriptions() throws Exception {
      MQTT mqtt = createMQTTConnection();
      mqtt.setClientId("foo");
      mqtt.setKeepAlive((short) 20);

      final int[] actualQoS = {-1};
      mqtt.setTracer(new Tracer() {
         @Override
         public void onReceive(MQTTFrame frame) {
            // validate the QoS
            if (frame.messageType() == PUBLISH.TYPE) {
               actualQoS[0] = frame.qos().ordinal();
            }
         }
      });

      final BlockingConnection connection = mqtt.blockingConnection();
      connection.connect();

      final String RETAIN = "RETAIN";
      connection.publish("TopicA", RETAIN.getBytes(), QoS.EXACTLY_ONCE, true);

      QoS[] qoss = {QoS.AT_MOST_ONCE, QoS.AT_MOST_ONCE, QoS.AT_LEAST_ONCE, QoS.EXACTLY_ONCE};
      for (QoS qos : qoss) {
         connection.subscribe(new Topic[]{new Topic("TopicA", qos)});

         final Message msg = connection.receive(5000, TimeUnit.MILLISECONDS);
         assertNotNull("No message for " + qos, msg);
         assertEquals(RETAIN, new String(msg.getPayload()));
         msg.ack();
         int waitCount = 0;
         while (actualQoS[0] == -1 && waitCount < 10) {
            Thread.sleep(1000);
            waitCount++;
         }
         assertEquals(qos.ordinal(), actualQoS[0]);
         actualQoS[0] = -1;
      }

      connection.unsubscribe(new String[]{"TopicA"});
      connection.disconnect();

   }

   @Test(timeout = 120 * 1000)
   public void testRetainedMessage() throws Exception {
      MQTT mqtt = createMQTTConnection();
      mqtt.setKeepAlive((short) 60);

      final String RETAIN = "RETAIN";
      final String TOPICA = "TopicA";

      final String[] clientIds = {null, "foo", "durable"};
      for (String clientId : clientIds) {
         LOG.info("Testing now with Client ID: {}", clientId);

         mqtt.setClientId(clientId);
         mqtt.setCleanSession(!"durable".equals(clientId));

         BlockingConnection connection = mqtt.blockingConnection();
         connection.connect();

         // set retained message and check
         connection.publish(TOPICA, RETAIN.getBytes(), QoS.EXACTLY_ONCE, true);
         connection.subscribe(new Topic[]{new Topic(TOPICA, QoS.AT_LEAST_ONCE)});
         Message msg = connection.receive(5000, TimeUnit.MILLISECONDS);
         assertNotNull("No retained message for " + clientId, msg);
         assertEquals(RETAIN, new String(msg.getPayload()));
         msg.ack();
         assertNull(connection.receive(500, TimeUnit.MILLISECONDS));

         // test duplicate subscription
         connection.subscribe(new Topic[]{new Topic(TOPICA, QoS.AT_LEAST_ONCE)});
         msg = connection.receive(15000, TimeUnit.MILLISECONDS);
         assertNotNull("No retained message on duplicate subscription for " + clientId, msg);
         assertEquals(RETAIN, new String(msg.getPayload()));
         msg.ack();
         assertNull(connection.receive(500, TimeUnit.MILLISECONDS));
         connection.unsubscribe(new String[]{TOPICA});

         // clear retained message and check that we don't receive it
         connection.publish(TOPICA, "".getBytes(), QoS.AT_MOST_ONCE, true);
         connection.subscribe(new Topic[]{new Topic(TOPICA, QoS.AT_LEAST_ONCE)});
         msg = connection.receive(500, TimeUnit.MILLISECONDS);
         assertNull("Retained message not cleared for " + clientId, msg);
         connection.unsubscribe(new String[]{TOPICA});

         // set retained message again and check
         connection.publish(TOPICA, RETAIN.getBytes(), QoS.EXACTLY_ONCE, true);
         connection.subscribe(new Topic[]{new Topic(TOPICA, QoS.AT_LEAST_ONCE)});
         msg = connection.receive(5000, TimeUnit.MILLISECONDS);
         assertNotNull("No reset retained message for " + clientId, msg);
         assertEquals(RETAIN, new String(msg.getPayload()));
         msg.ack();
         assertNull(connection.receive(500, TimeUnit.MILLISECONDS));

         // re-connect and check
         connection.disconnect();
         connection = mqtt.blockingConnection();
         connection.connect();
         connection.subscribe(new Topic[]{new Topic(TOPICA, QoS.AT_LEAST_ONCE)});
         msg = connection.receive(5000, TimeUnit.MILLISECONDS);
         assertNotNull("No reset retained message for " + clientId, msg);
         assertEquals(RETAIN, new String(msg.getPayload()));
         msg.ack();
         assertNull(connection.receive(500, TimeUnit.MILLISECONDS));

         connection.unsubscribe(new String[]{TOPICA});
         connection.disconnect();
      }
   }

   @Ignore
   @Test(timeout = 120 * 1000)
   public void testRetainedMessageOnVirtualTopics() throws Exception {
      MQTT mqtt = createMQTTConnection();
      mqtt.setKeepAlive((short) 60);

      final String RETAIN = "RETAIN";
      final String TOPICA = "VirtualTopic/TopicA";

      final String[] clientIds = {null, "foo", "durable"};
      for (String clientId : clientIds) {
         LOG.info("Testing now with Client ID: {}", clientId);

         mqtt.setClientId(clientId);
         mqtt.setCleanSession(!"durable".equals(clientId));

         BlockingConnection connection = mqtt.blockingConnection();
         connection.connect();

         // set retained message and check
         connection.publish(TOPICA, RETAIN.getBytes(), QoS.EXACTLY_ONCE, true);
         connection.subscribe(new Topic[]{new Topic(TOPICA, QoS.AT_LEAST_ONCE)});
         Message msg = connection.receive(5000, TimeUnit.MILLISECONDS);
         assertNotNull("No retained message for " + clientId, msg);
         assertEquals(RETAIN, new String(msg.getPayload()));
         msg.ack();
         assertNull(connection.receive(500, TimeUnit.MILLISECONDS));

         // test duplicate subscription
         connection.subscribe(new Topic[]{new Topic(TOPICA, QoS.AT_LEAST_ONCE)});
         msg = connection.receive(15000, TimeUnit.MILLISECONDS);
         assertNotNull("No retained message on duplicate subscription for " + clientId, msg);
         assertEquals(RETAIN, new String(msg.getPayload()));
         msg.ack();
         assertNull(connection.receive(500, TimeUnit.MILLISECONDS));
         connection.unsubscribe(new String[]{TOPICA});

         // clear retained message and check that we don't receive it
         connection.publish(TOPICA, "".getBytes(), QoS.AT_MOST_ONCE, true);
         connection.subscribe(new Topic[]{new Topic(TOPICA, QoS.AT_LEAST_ONCE)});
         msg = connection.receive(500, TimeUnit.MILLISECONDS);
         assertNull("Retained message not cleared for " + clientId, msg);
         connection.unsubscribe(new String[]{TOPICA});

         // set retained message again and check
         connection.publish(TOPICA, RETAIN.getBytes(), QoS.EXACTLY_ONCE, true);
         connection.subscribe(new Topic[]{new Topic(TOPICA, QoS.AT_LEAST_ONCE)});
         msg = connection.receive(5000, TimeUnit.MILLISECONDS);
         assertNotNull("No reset retained message for " + clientId, msg);
         assertEquals(RETAIN, new String(msg.getPayload()));
         msg.ack();
         assertNull(connection.receive(500, TimeUnit.MILLISECONDS));

         // re-connect and check
         connection.disconnect();
         connection = mqtt.blockingConnection();
         connection.connect();
         connection.subscribe(new Topic[]{new Topic(TOPICA, QoS.AT_LEAST_ONCE)});
         msg = connection.receive(5000, TimeUnit.MILLISECONDS);
         assertNotNull("No reset retained message for " + clientId, msg);
         assertEquals(RETAIN, new String(msg.getPayload()));
         msg.ack();
         assertNull(connection.receive(500, TimeUnit.MILLISECONDS));

         LOG.info("Test now unsubscribing from: {} for the last time", TOPICA);
         connection.unsubscribe(new String[]{TOPICA});
         connection.disconnect();
      }
   }

   @Test(timeout = 60 * 1000)
   public void testUniqueMessageIds() throws Exception {
      MQTT mqtt = createMQTTConnection();
      mqtt.setClientId("foo");
      mqtt.setKeepAlive((short) 2);
      mqtt.setCleanSession(true);

      final List<PUBLISH> publishList = new ArrayList<>();
      mqtt.setTracer(new Tracer() {
         @Override
         public void onReceive(MQTTFrame frame) {
            LOG.info("Client received:\n" + frame);
            if (frame.messageType() == PUBLISH.TYPE) {
               PUBLISH publish = new PUBLISH();
               try {
                  publish.decode(frame);
               } catch (ProtocolException e) {
                  fail("Error decoding publish " + e.getMessage());
               }
               publishList.add(publish);
            }
         }

         @Override
         public void onSend(MQTTFrame frame) {
            LOG.info("Client sent:\n" + frame);
         }
      });

      final BlockingConnection connection = mqtt.blockingConnection();
      connection.connect();

      // create overlapping subscriptions with different QoSs
      QoS[] qoss = {QoS.AT_MOST_ONCE, QoS.AT_LEAST_ONCE, QoS.EXACTLY_ONCE};
      final String TOPIC = "TopicA/";

      // publish retained message
      connection.publish(TOPIC, TOPIC.getBytes(), QoS.EXACTLY_ONCE, true);

      String[] subs = {TOPIC, "TopicA/#", "TopicA/+"};
      for (int i = 0; i < qoss.length; i++) {
         connection.subscribe(new Topic[]{new Topic(subs[i], qoss[i])});
      }

      // publish non-retained message
      connection.publish(TOPIC, TOPIC.getBytes(), QoS.EXACTLY_ONCE, false);
      int received = 0;

      Message msg = connection.receive(5000, TimeUnit.MILLISECONDS);
      do {
         assertNotNull(msg);
         assertEquals(TOPIC, new String(msg.getPayload()));
         msg.ack();
         int waitCount = 0;
         while (publishList.size() <= received && waitCount < 10) {
            Thread.sleep(1000);
            waitCount++;
         }
         msg = connection.receive(5000, TimeUnit.MILLISECONDS);
      } while (msg != null && received++ < subs.length * 2);
      assertEquals("Unexpected number of messages", subs.length * 2, received + 1);

      // make sure we received distinct ids for QoS != AT_MOST_ONCE, and 0 for
      // AT_MOST_ONCE
      for (int i = 0; i < publishList.size(); i++) {
         for (int j = i + 1; j < publishList.size(); j++) {
            final PUBLISH publish1 = publishList.get(i);
            final PUBLISH publish2 = publishList.get(j);
            boolean qos0 = false;
            if (publish1.qos() == QoS.AT_MOST_ONCE) {
               qos0 = true;
               assertEquals(0, publish1.messageId());
            }
            if (publish2.qos() == QoS.AT_MOST_ONCE) {
               qos0 = true;
               assertEquals(0, publish2.messageId());
            }
            if (!qos0) {
               assertNotEquals(publish1.messageId(), publish2.messageId());
            }
         }
      }

      connection.unsubscribe(subs);
      connection.disconnect();
   }

   @Test(timeout = 60 * 1000)
   public void testResendMessageId() throws Exception {
      final MQTT mqtt = createMQTTConnection("resend", false);
      mqtt.setKeepAlive((short) 5);

      final List<PUBLISH> publishList = new ArrayList<>();
      mqtt.setTracer(new Tracer() {
         @Override
         public void onReceive(MQTTFrame frame) {
            LOG.info("Client received:\n" + frame);
            if (frame.messageType() == PUBLISH.TYPE) {
               PUBLISH publish = new PUBLISH();
               try {
                  publish.decode(frame);
               } catch (ProtocolException e) {
                  fail("Error decoding publish " + e.getMessage());
               }
               publishList.add(publish);
            }
         }

         @Override
         public void onSend(MQTTFrame frame) {
            LOG.info("Client sent:\n" + frame);
         }
      });

      BlockingConnection connection = mqtt.blockingConnection();
      connection.connect();
      final String TOPIC = "TopicA/";
      final String[] topics = new String[]{TOPIC, "TopicA/+"};
      connection.subscribe(new Topic[]{new Topic(topics[0], QoS.AT_LEAST_ONCE), new Topic(topics[1], QoS.EXACTLY_ONCE)});

      // publish non-retained message
      connection.publish(TOPIC, TOPIC.getBytes(), QoS.EXACTLY_ONCE, false);

      Wait.waitFor(new Wait.Condition() {
         @Override
         public boolean isSatisified() throws Exception {
            return publishList.size() == 2;
         }
      }, 5000);
      assertEquals(2, publishList.size());

      connection.disconnect();

      connection = mqtt.blockingConnection();
      connection.connect();

      Wait.waitFor(new Wait.Condition() {
         @Override
         public boolean isSatisified() throws Exception {
            return publishList.size() == 4;
         }
      }, 5000);
      assertEquals(4, publishList.size());

      // TODO Investigate if receiving the same ID for overlapping subscriptions is actually spec compliant.
      // In Artemis we send a new ID for every copy of the message.

      // make sure we received duplicate message ids
      //      assertTrue(publishList.get(0).messageId() == publishList.get(2).messageId() || publishList.get(0).messageId() == publishList.get(3).messageId());
      //      assertTrue(publishList.get(1).messageId() == publishList.get(3).messageId() || publishList.get(1).messageId() == publishList.get(2).messageId());
      //      assertTrue(publishList.get(2).dup() && publishList.get(3).dup());

      connection.unsubscribe(topics);
      connection.disconnect();
   }

   @Test(timeout = 90 * 1000)
   public void testPacketIdGeneratorNonCleanSession() throws Exception {
      final MQTT mqtt = createMQTTConnection("nonclean-packetid", false);
      mqtt.setKeepAlive((short) 15);

      final Map<Short, PUBLISH> publishMap = new ConcurrentHashMap<>();
      mqtt.setTracer(new Tracer() {
         @Override
         public void onReceive(MQTTFrame frame) {
            LOG.info("Client received:\n" + frame);
            if (frame.messageType() == PUBLISH.TYPE) {
               PUBLISH publish = new PUBLISH();
               try {
                  publish.decode(frame);
                  LOG.info("PUBLISH " + publish);
               } catch (ProtocolException e) {
                  fail("Error decoding publish " + e.getMessage());
               }
               if (publishMap.get(publish.messageId()) != null) {
                  assertTrue(publish.dup());
               }
               publishMap.put(publish.messageId(), publish);
            }
         }

         @Override
         public void onSend(MQTTFrame frame) {
            LOG.info("Client sent:\n" + frame);
         }
      });

      BlockingConnection connection = mqtt.blockingConnection();
      connection.connect();
      final String TOPIC = "TopicA/";
      connection.subscribe(new Topic[]{new Topic(TOPIC, QoS.EXACTLY_ONCE)});

      // publish non-retained messages
      final int TOTAL_MESSAGES = 10;
      for (int i = 0; i < TOTAL_MESSAGES; i++) {
         connection.publish(TOPIC, TOPIC.getBytes(), QoS.EXACTLY_ONCE, false);
      }

      // receive half the messages in this session
      for (int i = 0; i < TOTAL_MESSAGES / 2; i++) {
         final Message msg = connection.receive(1000, TimeUnit.MILLISECONDS);
         assertNotNull(msg);
         assertEquals(TOPIC, new String(msg.getPayload()));
         msg.ack();
      }

      connection.disconnect();
      // resume session
      connection = mqtt.blockingConnection();
      connection.connect();
      // receive rest of the messages
      Message msg = null;
      do {
         msg = connection.receive(1000, TimeUnit.MILLISECONDS);
         if (msg != null) {
            assertEquals(TOPIC, new String(msg.getPayload()));
            msg.ack();
         }
      } while (msg != null);

      // make sure we received all message ids
      for (short id = 1; id <= TOTAL_MESSAGES; id++) {
         assertNotNull("No message for id " + id, publishMap.get(id));
      }

      connection.unsubscribe(new String[]{TOPIC});
      connection.disconnect();
   }

   @Ignore
   @Test(timeout = 90 * 1000)
   // TODO ActiveMQ 5.x does not reset the message id generator even after a clean session.  In Artemis we always reset.
   // If there is a good reason for this we should follow ActiveMQ.
   public void testPacketIdGeneratorCleanSession() throws Exception {
      final String[] cleanClientIds = new String[]{"", "clean-packetid", null};
      final Map<Short, PUBLISH> publishMap = new ConcurrentHashMap<>();
      MQTT[] mqtts = new MQTT[cleanClientIds.length];
      for (int i = 0; i < cleanClientIds.length; i++) {
         mqtts[i] = createMQTTConnection("", true);
         mqtts[i].setKeepAlive((short) 15);

         mqtts[i].setTracer(new Tracer() {
            @Override
            public void onReceive(MQTTFrame frame) {
               LOG.info("Client received:\n" + frame);
               if (frame.messageType() == PUBLISH.TYPE) {
                  PUBLISH publish = new PUBLISH();
                  try {
                     publish.decode(frame);
                     LOG.info("PUBLISH " + publish);
                  } catch (ProtocolException e) {
                     fail("Error decoding publish " + e.getMessage());
                  }
                  if (publishMap.get(publish.messageId()) != null) {
                     assertTrue(publish.dup());
                  }
                  publishMap.put(publish.messageId(), publish);
               }
            }

            @Override
            public void onSend(MQTTFrame frame) {
               LOG.info("Client sent:\n" + frame);
            }
         });
      }

      final Random random = new Random();
      for (short i = 0; i < 10; i++) {
         BlockingConnection connection = mqtts[random.nextInt(cleanClientIds.length)].blockingConnection();
         connection.connect();
         final String TOPIC = "TopicA/";
         connection.subscribe(new Topic[]{new Topic(TOPIC, QoS.EXACTLY_ONCE)});

         // publish non-retained message
         connection.publish(TOPIC, TOPIC.getBytes(), QoS.EXACTLY_ONCE, false);
         Message msg = connection.receive(1000, TimeUnit.MILLISECONDS);
         assertNotNull(msg);
         assertEquals(TOPIC, new String(msg.getPayload()));
         msg.ack();

         assertEquals(1, publishMap.size());
         final short id = (short) (i + 1);
         assertNotNull("No message for id " + id, publishMap.get(id));
         publishMap.clear();

         connection.disconnect();
      }

   }

   @Test(timeout = 60 * 1000)
   public void testClientConnectionFailure() throws Exception {
      MQTT mqtt = createMQTTConnection("reconnect", false);
      mqtt.setKeepAlive((short) 1);

      final BlockingConnection connection = mqtt.blockingConnection();
      connection.connect();
      Wait.waitFor(new Wait.Condition() {
         @Override
         public boolean isSatisified() throws Exception {
            return connection.isConnected();
         }
      });

      final String TOPIC = "TopicA";
      final byte[] qos = connection.subscribe(new Topic[]{new Topic(TOPIC, QoS.EXACTLY_ONCE)});
      assertEquals(QoS.EXACTLY_ONCE.ordinal(), qos[0]);
      connection.publish(TOPIC, TOPIC.getBytes(), QoS.EXACTLY_ONCE, false);
      // kill transport
      connection.kill();

      // FIXME Wait for the previous connection to timeout.  This is not required in ActiveMQ.  Needs investigating.
      Thread.sleep(10000);

      final BlockingConnection newConnection = mqtt.blockingConnection();
      newConnection.connect();
      Wait.waitFor(new Wait.Condition() {
         @Override
         public boolean isSatisified() throws Exception {
            return newConnection.isConnected();
         }
      });

      assertEquals(QoS.EXACTLY_ONCE.ordinal(), qos[0]);
      Message msg = newConnection.receive(1000, TimeUnit.MILLISECONDS);
      assertNotNull(msg);
      assertEquals(TOPIC, new String(msg.getPayload()));
      msg.ack();
      newConnection.disconnect();
   }

   @Test(timeout = 60 * 1000)
   public void testClientConnectionFailureSendsWillMessage() throws Exception {
      getServer().createQueue(SimpleString.toSimpleString("will"), SimpleString.toSimpleString("will"), null, true, false);

      MQTT mqtt = createMQTTConnection("1", false);
      mqtt.setKeepAlive((short) 1);
      mqtt.setWillMessage("test message");
      mqtt.setWillTopic("will");
      mqtt.setWillQos(QoS.AT_LEAST_ONCE);

      final BlockingConnection connection = mqtt.blockingConnection();
      connection.connect();
      long time = System.currentTimeMillis();
      while (connection.isConnected() && time + 10000 < System.currentTimeMillis()) {
         Thread.sleep(1000);
      }

      MQTT mqtt2 = createMQTTConnection("2", false);
      BlockingConnection connection2 = mqtt2.blockingConnection();
      connection2.connect();
      connection2.subscribe(new Topic[]{new Topic("will", QoS.AT_LEAST_ONCE)});

      // kill transport
      connection.kill();

      // FIXME Wait for the previous connection to timeout.  This is not required in ActiveMQ.  Needs investigating.
      Thread.sleep(10000);
      Message m = connection2.receive(1000, TimeUnit.MILLISECONDS);
      assertEquals("test message", new String(m.getPayload()));
   }

   @Test(timeout = 60 * 1000)
   public void testWillMessageIsRetained() throws Exception {
      getServer().createQueue(SimpleString.toSimpleString("will"), SimpleString.toSimpleString("will"), null, true, false);

      MQTT mqtt = createMQTTConnection("1", false);
      mqtt.setKeepAlive((short) 1);
      mqtt.setWillMessage("test message");
      mqtt.setWillTopic("will");
      mqtt.setWillQos(QoS.AT_LEAST_ONCE);
      mqtt.setWillRetain(true);

      final BlockingConnection connection = mqtt.blockingConnection();
      connection.connect();

      Wait.waitFor(new Wait.Condition() {
         @Override
         public boolean isSatisified() throws Exception {
            return connection.isConnected();
         }
      });

      // kill transport
      connection.kill();

      Thread.sleep(10000);

      MQTT mqtt2 = createMQTTConnection("2", false);
      BlockingConnection connection2 = mqtt2.blockingConnection();
      connection2.connect();
      connection2.subscribe(new Topic[]{new Topic("will", QoS.AT_LEAST_ONCE)});

      Message m = connection2.receive(1000, TimeUnit.MILLISECONDS);
      assertNotNull(m);
      m.ack();
      assertEquals("test message", new String(m.getPayload()));
   }


   @Test(timeout = 60 * 1000)
   public void testCleanSession() throws Exception {
      final String CLIENTID = "cleansession";
      final MQTT mqttNotClean = createMQTTConnection(CLIENTID, false);
      BlockingConnection notClean = mqttNotClean.blockingConnection();
      final String TOPIC = "TopicA";
      notClean.connect();
      notClean.subscribe(new Topic[]{new Topic(TOPIC, QoS.EXACTLY_ONCE)});
      notClean.publish(TOPIC, TOPIC.getBytes(), QoS.EXACTLY_ONCE, false);
      notClean.disconnect();

      // MUST receive message from previous not clean session
      notClean = mqttNotClean.blockingConnection();
      notClean.connect();
      Message msg = notClean.receive(10000, TimeUnit.MILLISECONDS);
      assertNotNull(msg);
      assertEquals(TOPIC, new String(msg.getPayload()));
      msg.ack();
      notClean.publish(TOPIC, TOPIC.getBytes(), QoS.EXACTLY_ONCE, false);
      notClean.disconnect();

      // MUST NOT receive message from previous not clean session
      final MQTT mqttClean = createMQTTConnection(CLIENTID, true);
      final BlockingConnection clean = mqttClean.blockingConnection();
      clean.connect();
      msg = clean.receive(10000, TimeUnit.MILLISECONDS);
      assertNull(msg);
      clean.subscribe(new Topic[]{new Topic(TOPIC, QoS.EXACTLY_ONCE)});
      clean.publish(TOPIC, TOPIC.getBytes(), QoS.EXACTLY_ONCE, false);
      clean.disconnect();

      // MUST NOT receive message from previous clean session
      notClean = mqttNotClean.blockingConnection();
      notClean.connect();
      msg = notClean.receive(1000, TimeUnit.MILLISECONDS);
      assertNull(msg);
      notClean.disconnect();
   }

   @Test(timeout = 60 * 1000)
   public void testSendMQTTReceiveJMS() throws Exception {
      doTestSendMQTTReceiveJMS("foo.*", "foo/bar");
   }

   public void doTestSendMQTTReceiveJMS(String jmsTopicAddress, String mqttAddress) throws Exception {
      final MQTTClientProvider provider = getMQTTClientProvider();
      initializeConnection(provider);

      // send retained message
      final String address = "jms/queue/" + mqttAddress;
      final String RETAINED = "RETAINED";

      final byte[] payload = RETAINED.getBytes();

      Connection connection = cf.createConnection();
      // MUST set to true to receive retained messages
      connection.start();

      Session s = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
      javax.jms.Queue jmsQueue = s.createQueue(jmsTopicAddress);
      MessageConsumer consumer = s.createConsumer(jmsQueue);

      provider.publish(address, RETAINED.getBytes(), AT_LEAST_ONCE, true);

      // check whether we received retained message on JMS subscribe
      BytesMessage message = (BytesMessage) consumer.receive(5000);
      assertNotNull("Should get retained message", message);

      byte[] b = new byte[8];
      message.readBytes(b);
      assertArrayEquals(payload, b);

      for (int i = 0; i < NUM_MESSAGES; i++) {
         String p = "Test Message: " + i;
         provider.publish(address, p.getBytes(), AT_LEAST_ONCE);
         message = (BytesMessage) consumer.receive(5000);
         assertNotNull("Should get a message", message);

         byte[] bytePayload = new byte[p.getBytes().length];
         message.readBytes(bytePayload);
         assertArrayEquals(payload, b);
      }

      connection.close();
      provider.disconnect();
   }

   @Test(timeout = 2 * 60 * 1000)
   public void testSendJMSReceiveMQTT() throws Exception {
      doTestSendJMSReceiveMQTT("foo.far");
   }

   public void doTestSendJMSReceiveMQTT(String destinationName) throws Exception {
      final MQTTClientProvider provider = getMQTTClientProvider();
      initializeConnection(provider);
      provider.subscribe("jms/queue/foo/+", AT_MOST_ONCE);

      Connection connection = cf.createConnection();
      connection.start();

      Session s = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
      javax.jms.Queue queue = s.createQueue(destinationName);
      MessageProducer producer = s.createProducer(queue);

      // send retained message from JMS
      final byte[] bytes = new byte[]{1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
      BytesMessage bytesMessage = s.createBytesMessage();
      bytesMessage.writeBytes(bytes);
      producer.send(bytesMessage);

      byte[] message = provider.receive(10000);
      assertNotNull("Should get retained message", message);
      assertArrayEquals(bytes, message);

      provider.disconnect();
      connection.close();
   }

   @Test(timeout = 60 * 1000)
   public void testPingKeepsInactivityMonitorAlive() throws Exception {
      MQTT mqtt = createMQTTConnection();
      mqtt.setClientId("foo");
      mqtt.setKeepAlive((short) 2);
      final BlockingConnection connection = mqtt.blockingConnection();
      connection.connect();

      assertTrue("KeepAlive didn't work properly", Wait.waitFor(new Wait.Condition() {

         @Override
         public boolean isSatisified() throws Exception {
            return connection.isConnected();
         }
      }));

      connection.disconnect();
   }

   @Test(timeout = 60 * 1000)
   public void testTurnOffInactivityMonitor() throws Exception {
      stopBroker();
      protocolConfig = "transport.useInactivityMonitor=false";
      startBroker();

      MQTT mqtt = createMQTTConnection();
      mqtt.setClientId("foo3");
      mqtt.setKeepAlive((short) 2);
      final BlockingConnection connection = mqtt.blockingConnection();
      connection.connect();

      assertTrue("KeepAlive didn't work properly", Wait.waitFor(new Wait.Condition() {

         @Override
         public boolean isSatisified() throws Exception {
            return connection.isConnected();
         }
      }));

      connection.disconnect();
   }

   @Ignore
   @Test(timeout = 60 * 1000)
   // TODO Make dollar topics configurable in code base.
   public void testPublishDollarTopics() throws Exception {
      MQTT mqtt = createMQTTConnection();
      final String clientId = "publishDollar";
      mqtt.setClientId(clientId);
      mqtt.setKeepAlive((short) 2);
      BlockingConnection connection = mqtt.blockingConnection();
      connection.connect();

      final String DOLLAR_TOPIC = "$TopicA";
      connection.subscribe(new Topic[]{new Topic(DOLLAR_TOPIC, QoS.EXACTLY_ONCE)});
      connection.publish(DOLLAR_TOPIC, DOLLAR_TOPIC.getBytes(), QoS.EXACTLY_ONCE, true);

      Message message = connection.receive(10, TimeUnit.SECONDS);
      assertNull("Publish enabled for $ Topics by default", message);
      connection.disconnect();

      stopBroker();
      protocolConfig = "transport.publishDollarTopics=true";
      startBroker();

      mqtt = createMQTTConnection();
      mqtt.setClientId(clientId);
      mqtt.setKeepAlive((short) 2);
      connection = mqtt.blockingConnection();
      connection.connect();

      connection.subscribe(new Topic[]{new Topic(DOLLAR_TOPIC, QoS.EXACTLY_ONCE)});
      connection.publish(DOLLAR_TOPIC, DOLLAR_TOPIC.getBytes(), QoS.EXACTLY_ONCE, true);

      message = connection.receive(10, TimeUnit.SECONDS);
      assertNotNull(message);
      message.ack();
      assertEquals("Message body", DOLLAR_TOPIC, new String(message.getPayload()));

      connection.disconnect();
   }

   @Ignore
   @Test(timeout = 60 * 1000)
   // TODO We currently do not support link stealing.  This needs to be enabled for this test to pass.
   public void testDuplicateClientId() throws Exception {
      // test link stealing enabled by default
      final String clientId = "duplicateClient";
      MQTT mqtt = createMQTTConnection(clientId, false);
      mqtt.setKeepAlive((short) 2);
      final BlockingConnection connection = mqtt.blockingConnection();
      connection.connect();
      final String TOPICA = "TopicA";
      connection.publish(TOPICA, TOPICA.getBytes(), QoS.EXACTLY_ONCE, true);

      MQTT mqtt1 = createMQTTConnection(clientId, false);
      mqtt1.setKeepAlive((short) 2);
      final BlockingConnection connection1 = mqtt1.blockingConnection();
      connection1.connect();

      assertTrue("Duplicate client disconnected", Wait.waitFor(new Wait.Condition() {
         @Override
         public boolean isSatisified() throws Exception {
            return connection1.isConnected();
         }
      }));

      assertTrue("Old client still connected", Wait.waitFor(new Wait.Condition() {
         @Override
         public boolean isSatisified() throws Exception {
            return !connection.isConnected();
         }
      }));

      connection1.publish(TOPICA, TOPICA.getBytes(), QoS.EXACTLY_ONCE, true);
      connection1.disconnect();

      // disable link stealing
      stopBroker();
      protocolConfig = "allowLinkStealing=false";
      startBroker();

      mqtt = createMQTTConnection(clientId, false);
      mqtt.setKeepAlive((short) 2);
      final BlockingConnection connection2 = mqtt.blockingConnection();
      connection2.connect();
      connection2.publish(TOPICA, TOPICA.getBytes(), QoS.EXACTLY_ONCE, true);

      mqtt1 = createMQTTConnection(clientId, false);
      mqtt1.setKeepAlive((short) 2);
      final BlockingConnection connection3 = mqtt1.blockingConnection();
      try {
         connection3.connect();
         fail("Duplicate client connected");
      } catch (Exception e) {
         // ignore
      }

      assertTrue("Old client disconnected", connection2.isConnected());
      connection2.publish(TOPICA, TOPICA.getBytes(), QoS.EXACTLY_ONCE, true);
      connection2.disconnect();
   }

   @Test(timeout = 30 * 10000)
   public void testJmsMapping() throws Exception {
      doTestJmsMapping("test.foo");
   }

   // TODO As with other tests, this should be enabled as part of the cross protocol support with MQTT.
   public void doTestJmsMapping(String destinationName) throws Exception {
      // start up jms consumer
      Connection jmsConn = cf.createConnection();
      Session session = jmsConn.createSession(false, Session.AUTO_ACKNOWLEDGE);
      Destination dest = session.createQueue(destinationName);
      MessageConsumer consumer = session.createConsumer(dest);
      jmsConn.start();

      // set up mqtt producer
      MQTT mqtt = createMQTTConnection();
      mqtt.setClientId("foo3");
      mqtt.setKeepAlive((short) 2);
      final BlockingConnection connection = mqtt.blockingConnection();
      connection.connect();

      int messagesToSend = 5;

      // publish
      for (int i = 0; i < messagesToSend; ++i) {
         connection.publish("jms/queue/test/foo", "hello world".getBytes(), QoS.AT_LEAST_ONCE, false);
      }

      connection.disconnect();

      for (int i = 0; i < messagesToSend; i++) {

         javax.jms.Message message = consumer.receive(2 * 1000);
         assertNotNull(message);
         assertTrue(message instanceof BytesMessage);
         BytesMessage bytesMessage = (BytesMessage) message;

         int length = (int) bytesMessage.getBodyLength();
         byte[] buffer = new byte[length];
         bytesMessage.readBytes(buffer);
         assertEquals("hello world", new String(buffer));
      }

      jmsConn.close();
   }

   @Test(timeout = 30 * 10000)
   public void testSubscribeMultipleTopics() throws Exception {

      byte[] payload = new byte[1024 * 32];
      for (int i = 0; i < payload.length; i++) {
         payload[i] = '2';
      }

      MQTT mqtt = createMQTTConnection();
      mqtt.setClientId("MQTT-Client");
      mqtt.setCleanSession(false);

      final BlockingConnection connection = mqtt.blockingConnection();
      connection.connect();

      Topic[] topics = {new Topic("Topic/A", QoS.EXACTLY_ONCE), new Topic("Topic/B", QoS.EXACTLY_ONCE)};
      Topic[] wildcardTopic = {new Topic("Topic/#", QoS.AT_LEAST_ONCE)};
      connection.subscribe(wildcardTopic);

      for (Topic topic : topics) {
         connection.publish(topic.name().toString(), payload, QoS.AT_LEAST_ONCE, false);
      }

      int received = 0;
      for (int i = 0; i < topics.length; ++i) {
         Message message = connection.receive();
         assertNotNull(message);
         received++;
         payload = message.getPayload();
         String messageContent = new String(payload);
         LOG.info("Received message from topic: " + message.getTopic() + " Message content: " + messageContent);
         message.ack();
      }

      assertEquals("Should have received " + topics.length + " messages", topics.length, received);
   }

   @Test(timeout = 60 * 1000)
   public void testReceiveMessageSentWhileOffline() throws Exception {
      final byte[] payload = new byte[1024 * 32];
      for (int i = 0; i < payload.length; i++) {
         payload[i] = '2';
      }

      int numberOfRuns = 100;
      int messagesPerRun = 2;

      final MQTT mqttPub = createMQTTConnection("MQTT-Pub-Client", true);
      final MQTT mqttSub = createMQTTConnection("MQTT-Sub-Client", false);

      final BlockingConnection connectionPub = mqttPub.blockingConnection();
      connectionPub.connect();

      BlockingConnection connectionSub = mqttSub.blockingConnection();
      connectionSub.connect();

      Topic[] topics = {new Topic("TopicA", QoS.EXACTLY_ONCE)};
      connectionSub.subscribe(topics);

      for (int i = 0; i < messagesPerRun; ++i) {
         connectionPub.publish(topics[0].name().toString(), payload, QoS.AT_LEAST_ONCE, false);
      }

      int received = 0;
      for (int i = 0; i < messagesPerRun; ++i) {
         Message message = connectionSub.receive(5, TimeUnit.SECONDS);
         assertNotNull(message);
         received++;
         assertTrue(Arrays.equals(payload, message.getPayload()));
         message.ack();
      }
      connectionSub.disconnect();

      for (int j = 0; j < numberOfRuns; j++) {

         for (int i = 0; i < messagesPerRun; ++i) {
            connectionPub.publish(topics[0].name().toString(), payload, QoS.AT_LEAST_ONCE, false);
         }

         connectionSub = mqttSub.blockingConnection();
         connectionSub.connect();
         connectionSub.subscribe(topics);

         for (int i = 0; i < messagesPerRun; ++i) {
            Message message = connectionSub.receive(5, TimeUnit.SECONDS);
            assertNotNull(message);
            received++;
            assertTrue(Arrays.equals(payload, message.getPayload()));
            message.ack();
         }
         connectionSub.disconnect();
      }
      assertEquals("Should have received " + (messagesPerRun * (numberOfRuns + 1)) + " messages", (messagesPerRun * (numberOfRuns + 1)), received);
   }

   @Test(timeout = 30 * 1000)
   public void testDefaultKeepAliveWhenClientSpecifiesZero() throws Exception {
      stopBroker();
      protocolConfig = "transport.defaultKeepAlive=2000";
      startBroker();

      MQTT mqtt = createMQTTConnection();
      mqtt.setClientId("foo");
      mqtt.setKeepAlive((short) 0);
      final BlockingConnection connection = mqtt.blockingConnection();
      connection.connect();

      assertTrue("KeepAlive didn't work properly", Wait.waitFor(new Wait.Condition() {

         @Override
         public boolean isSatisified() throws Exception {
            return connection.isConnected();
         }
      }));
   }

   @Test(timeout = 60 * 1000)
   public void testReuseConnection() throws Exception {
      MQTT mqtt = createMQTTConnection();
      mqtt.setClientId("Test-Client");

      {
         BlockingConnection connection = mqtt.blockingConnection();
         connection.connect();
         connection.disconnect();
         Thread.sleep(1000);
      }
      {
         BlockingConnection connection = mqtt.blockingConnection();
         connection.connect();
         connection.disconnect();
         Thread.sleep(1000);
      }
   }

   @Test(timeout = 60 * 1000)
   public void testNoMessageReceivedAfterUnsubscribeMQTT() throws Exception {
      Topic[] topics = {new Topic("TopicA", QoS.EXACTLY_ONCE)};

      MQTT mqttPub = createMQTTConnection("MQTTPub-Client", true);
      // mqttPub.setVersion("3.1.1");

      MQTT mqttSub = createMQTTConnection("MQTTSub-Client", false);
      // mqttSub.setVersion("3.1.1");

      BlockingConnection connectionPub = mqttPub.blockingConnection();
      connectionPub.connect();

      BlockingConnection connectionSub = mqttSub.blockingConnection();
      connectionSub.connect();
      connectionSub.subscribe(topics);
      connectionSub.disconnect();

      for (int i = 0; i < 5; i++) {
         String payload = "Message " + i;
         connectionPub.publish(topics[0].name().toString(), payload.getBytes(), QoS.EXACTLY_ONCE, false);
      }

      connectionSub = mqttSub.blockingConnection();
      connectionSub.connect();

      int received = 0;
      for (int i = 0; i < 5; ++i) {
         Message message = connectionSub.receive(5, TimeUnit.SECONDS);
         assertNotNull("Missing message " + i, message);
         LOG.info("Message is " + new String(message.getPayload()));
         received++;
         message.ack();
      }
      assertEquals(5, received);

      // unsubscribe from topic
      connectionSub.unsubscribe(new String[]{"TopicA"});

      // send more messages
      for (int i = 0; i < 5; i++) {
         String payload = "Message " + i;
         connectionPub.publish(topics[0].name().toString(), payload.getBytes(), QoS.EXACTLY_ONCE, false);
      }

      // these should not be received
      assertNull(connectionSub.receive(5, TimeUnit.SECONDS));

      connectionSub.disconnect();
      connectionPub.disconnect();
   }

   @Test(timeout = 60 * 1000)
   public void testMQTT311Connection() throws Exception {
      MQTT mqtt = createMQTTConnection();
      mqtt.setClientId("foo");
      mqtt.setVersion("3.1.1");
      final BlockingConnection connection = mqtt.blockingConnection();
      connection.connect();
      connection.disconnect();
   }

   // TODO This should be reworked to align with Artemis recovery.
   //   @Test(timeout = 60 * 1000)
   //   public void testActiveMQRecoveryPolicy() throws Exception {
   //      // test with ActiveMQ LastImageSubscriptionRecoveryPolicy
   //      final PolicyMap policyMap = new PolicyMap();
   //      final PolicyEntry policyEntry = new PolicyEntry();
   //      policyEntry.setSubscriptionRecoveryPolicy(new LastImageSubscriptionRecoveryPolicy());
   //      policyMap.put(new ActiveMQTopic(">"), policyEntry);
   //      brokerService.setDestinationPolicy(policyMap);
   //
   //      MQTT mqtt = createMQTTConnection("pub-sub", true);
   //      final int[] retain = new int[1];
   //      final int[] nonretain  = new int[1];
   //      mqtt.setTracer(new Tracer() {
   //         @Override
   //         public void onReceive(MQTTFrame frame) {
   //            if (frame.messageType() == PUBLISH.TYPE) {
   //               LOG.info("Received message with retain=" + frame.retain());
   //               if (frame.retain()) {
   //                  retain[0]++;
   //               } else {
   //                  nonretain[0]++;
   //               }
   //            }
   //         }
   //      });
   //
   //      BlockingConnection connection = mqtt.blockingConnection();
   //      connection.connect();
   //      final String RETAINED = "RETAINED";
   //      connection.publish("one", RETAINED.getBytes(), QoS.AT_LEAST_ONCE, true);
   //      connection.publish("two", RETAINED.getBytes(), QoS.AT_LEAST_ONCE, true);
   //
   //      final String NONRETAINED = "NONRETAINED";
   //      connection.publish("one", NONRETAINED.getBytes(), QoS.AT_LEAST_ONCE, false);
   //      connection.publish("two", NONRETAINED.getBytes(), QoS.AT_LEAST_ONCE, false);
   //
   //      connection.subscribe(new Topic[]{new Topic("#", QoS.AT_LEAST_ONCE)});
   //      for (int i = 0; i < 4; i++) {
   //         final Message message = connection.receive(30, TimeUnit.SECONDS);
   //         assertNotNull("Should receive 4 messages", message);
   //         message.ack();
   //      }
   //      assertEquals("Should receive 2 retained messages", 2, retain[0]);
   //      assertEquals("Should receive 2 non-retained messages", 2, nonretain[0]);
   //   }

   // TODO As with other tests, this should be enabled as part of the cross protocol support with MQTT.
   //   @Test(timeout = 60 * 1000)
   //   public void testSendMQTTReceiveJMSVirtualTopic() throws Exception {
   //
   //      final MQTTClientProvider provider = getMQTTClientProvider();
   //      initializeConnection(provider);
   //      final String DESTINATION_NAME = "Consumer.jms.VirtualTopic.TopicA";
   //
   //      // send retained message
   //      final String RETAINED = "RETAINED";
   //      final String MQTT_DESTINATION_NAME = "VirtualTopic/TopicA";
   //      provider.publish(MQTT_DESTINATION_NAME, RETAINED.getBytes(), AT_LEAST_ONCE, true);
   //
   //      ActiveMQConnection activeMQConnection = (ActiveMQConnection) new ActiveMQConnectionFactory(jmsUri).createConnection();
   //      // MUST set to true to receive retained messages
   //      activeMQConnection.setUseRetroactiveConsumer(true);
   //      activeMQConnection.start();
   //      Session s = activeMQConnection.createSession(false, Session.AUTO_ACKNOWLEDGE);
   //      Queue jmsQueue = s.createQueue(DESTINATION_NAME);
   //      MessageConsumer consumer = s.createConsumer(jmsQueue);
   //
   //      // check whether we received retained message on JMS subscribe
   //      ActiveMQMessage message = (ActiveMQMessage) consumer.receive(5000);
   //      assertNotNull("Should get retained message", message);
   //      ByteSequence bs = message.getContent();
   //      assertEquals(RETAINED, new String(bs.data, bs.offset, bs.length));
   //      assertTrue(message.getBooleanProperty(RetainedMessageSubscriptionRecoveryPolicy.RETAINED_PROPERTY));
   //
   //      for (int i = 0; i < NUM_MESSAGES; i++) {
   //         String payload = "Test Message: " + i;
   //         provider.publish(MQTT_DESTINATION_NAME, payload.getBytes(), AT_LEAST_ONCE);
   //         message = (ActiveMQMessage) consumer.receive(5000);
   //         assertNotNull("Should get a message", message);
   //         bs = message.getContent();
   //         assertEquals(payload, new String(bs.data, bs.offset, bs.length));
   //      }
   //
   //      // re-create consumer and check we received retained message again
   //      consumer.close();
   //      consumer = s.createConsumer(jmsQueue);
   //      message = (ActiveMQMessage) consumer.receive(5000);
   //      assertNotNull("Should get retained message", message);
   //      bs = message.getContent();
   //      assertEquals(RETAINED, new String(bs.data, bs.offset, bs.length));
   //      assertTrue(message.getBooleanProperty(RetainedMessageSubscriptionRecoveryPolicy.RETAINED_PROPERTY));
   //
   //      activeMQConnection.close();
   //      provider.disconnect();
   //   }

   @Test(timeout = 60 * 1000)
   public void testPingOnMQTT() throws Exception {
      stopBroker();
      protocolConfig = "maxInactivityDuration=-1";
      startBroker();

      MQTT mqtt = createMQTTConnection();
      mqtt.setClientId("test-mqtt");
      mqtt.setKeepAlive((short) 2);
      final BlockingConnection connection = mqtt.blockingConnection();
      connection.connect();
      assertTrue("KeepAlive didn't work properly", Wait.waitFor(new Wait.Condition() {

         @Override
         public boolean isSatisified() throws Exception {
            return connection.isConnected();
         }
      }));

      connection.disconnect();
   }

   @Test
   public void testRetainedMessagesAreCorrectlyFormedAfterRestart() throws Exception {
      String clientId = "testMqtt";
      String address = "testAddress";
      String payload = "This is a test message";

      // Send MQTT Retain Message
      Topic[] mqttTopic = new Topic[]{new Topic(address, QoS.AT_LEAST_ONCE)};

      MQTT mqtt = createMQTTConnection();
      mqtt.setClientId(clientId);
      BlockingConnection connection1 = mqtt.blockingConnection();
      connection1.connect();
      connection1.publish(address, payload.getBytes(), QoS.AT_LEAST_ONCE, true);

      getServer().stop(false);
      getServer().start();
      waitForServerToStart(getServer());

      MQTT mqtt2 = createMQTTConnection();
      mqtt2.setClientId(clientId + "2");
      BlockingConnection connection2 = mqtt2.blockingConnection();
      connection2.connect();
      connection2.subscribe(mqttTopic);

      Message message = connection2.receive(5000, TimeUnit.MILLISECONDS);
      assertEquals(payload, new String(message.getPayload()));
   }

   @Test
   public void testDuplicateIDReturnsError() throws Exception {
      String clientId = "clientId";
      MQTT mqtt = createMQTTConnection();
      mqtt.setClientId(clientId);
      mqtt.blockingConnection().connect();

      MQTTException e = null;
      try {
         MQTT mqtt2 = createMQTTConnection();
         mqtt2.setClientId(clientId);
         mqtt2.blockingConnection().connect();
      } catch (MQTTException mqttE) {
         e = mqttE;
      }
      assertTrue(e.getMessage().contains("CONNECTION_REFUSED_IDENTIFIER_REJECTED"));
   }
}
