ConnectionException from SmackException

Question

I am trying to write messaging application in which the app and server are in same apk file. the app sends message directly to GCM and from there to the apk installed on the device. when a call when connect() function is called for XMPPTCPConnection, it throws and exception org.jivesoftware.smack.SmackException$ConnectionException. Below is the code which connects to GCM server

package com.GcmServerImplementation;
import org.jivesoftware.smack.ConnectionConfiguration;
import org.jivesoftware.smack.ConnectionConfiguration.SecurityMode;
import org.jivesoftware.smack.ConnectionListener;
import org.jivesoftware.smack.PacketInterceptor;
import org.jivesoftware.smack.PacketListener;
import org.jivesoftware.smack.SmackException;
import org.jivesoftware.smack.SmackException.NotConnectedException;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.filter.PacketTypeFilter;
import org.jivesoftware.smack.packet.DefaultPacketExtension;
import org.jivesoftware.smack.packet.Message;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smack.packet.PacketExtension;
import org.jivesoftware.smack.provider.PacketExtensionProvider;
import org.jivesoftware.smack.provider.ProviderManager;
import org.jivesoftware.smack.tcp.XMPPTCPConnection;
import org.jivesoftware.smack.util.StringUtils;
import org.json.simple.JSONValue;
import org.json.simple.parser.ParseException;
import org.xmlpull.v1.XmlPullParser;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.net.ssl.SSLSocketFactory;

/**
 * Sample Smack implementation of a client for GCM Cloud Connection Server. This
 * code can be run as a standalone CCS client.
 *
 * <p>For illustration purposes only.
 */
public class SmackCcsClient 
{
    private static final Logger logger = Logger.getLogger("SmackCcsClient");

private static final String GCM_SERVER = "gcm.googleapis.com";
private static final int GCM_PORT = 5235;

private static final String GCM_ELEMENT_NAME = "gcm";
private static final String GCM_NAMESPACE = "google:mobile:data";
private static final long senderId = 561560678360L;
private static final String password = "AIzaSyDKiIbL8Dn_2Lxci_kN3shU9i_ORseJF08";
private XMPPConnection connection;

/**
 * Indicates whether the connection is in draining state, which means that it
 * will not accept any new downstream messages.
 */
protected volatile boolean connectionDraining = false;

static 
{
    ProviderManager.addExtensionProvider(GCM_ELEMENT_NAME, GCM_NAMESPACE,
        new PacketExtensionProvider() {
            @Override
            public PacketExtension parseExtension(XmlPullParser parser) throws
                    Exception {
                String json = parser.nextText();
                return new GcmPacketExtension(json);
            }
        });
}



/*public SmackCcsClient() throws Exception 
    {
        SmackCcsClient ccsClient = new SmackCcsClient();

        ccsClient.connect(senderId, password);
// Send a sample hello downstream message to a device.
        String toRegId ="APA91bHAxquB3kjk-VV5FY_dxgm1qYege0aepIZ7ZQ7rc8fPReiSPNCf5b7t5Hu4neKI7pf2Pl6P6D6M7zH17E9GJZmUV8Cu1BojlTTQQfM1IiZPomsxlyInZaZ5Qk6AP9qzAGz2oVVkC5zUZ5U2noERNxkUBqjfrw";
        String messageId = ccsClient.nextMessageId();
        Map<String, String> payload = new HashMap<String, String>();
        payload.put("Hello", "World");
        payload.put("CCS", "Dummy Message");
        payload.put("EmbeddedMessageId", messageId);
        String collapseKey = "sample";
        Long timeToLive = 10000L;
        String message = createJsonMessage(toRegId, messageId, payload, collapseKey, timeToLive, true);

        ccsClient.sendDownstreamMessage(message);
    }*/
/**
 * Sends a downstream message to GCM.
 *
 * @return true if the message has been successfully sent.
 */
public boolean sendDownstreamMessage(String jsonRequest) throws
        NotConnectedException {
    if (!connectionDraining) {
        send(jsonRequest);
        return true;
    }
    logger.info("Dropping downstream message since the connection is draining");
    return false;
}

/**
 * Returns a random message id to uniquely identify a message.
 *
 * <p>Note: This is generated by a pseudo random number generator for
 * illustration purpose, and is not guaranteed to be unique.
 */
public String nextMessageId() {
    return "m-" + UUID.randomUUID().toString();
}

/**
 * Sends a packet with contents provided.
 */
protected void send(String jsonRequest) throws NotConnectedException {
    Packet request = new GcmPacketExtension(jsonRequest).toPacket();
    connection.sendPacket(request);
}

/**
 * Handles an upstream data message from a device application.
 *
 * <p>This sample echo server sends an echo message back to the device.
 * Subclasses should override this method to properly process upstream messages.
 */
protected void handleUpstreamMessage(Map<String, Object> jsonObject) {
    // PackageName of the application that sent this message.
String category = (String) jsonObject.get("category");
String from = (String) jsonObject.get("from");
@SuppressWarnings("unchecked")
Map<String, String> payload = (Map<String, String>) jsonObject.get("data");
payload.put("ECHO", "Application: " + category);

// Send an ECHO response back
String echo = createJsonMessage(from, nextMessageId(), payload,
        "echo:CollapseKey", null, false);

try {
    sendDownstreamMessage(echo);
} catch (NotConnectedException e) {
    logger.log(Level.WARNING, "Not connected anymore, echo message is not sent", e);
    }
}

/**
 * Handles an ACK.
 *
 * <p>Logs a INFO message, but subclasses could override it to
 * properly handle ACKs.
 */
protected void handleAckReceipt(Map<String, Object> jsonObject) {
    String messageId = (String) jsonObject.get("message_id");
String from = (String) jsonObject.get("from");
logger.log(Level.INFO, "handleAckReceipt() from: " + from + ", messageId: " + messageId);
}

/**
 * Handles a NACK.
 *
 * <p>Logs a INFO message, but subclasses could override it to
 * properly handle NACKs.
 */
protected void handleNackReceipt(Map<String, Object> jsonObject) {
    String messageId = (String) jsonObject.get("message_id");
String from = (String) jsonObject.get("from");
logger.log(Level.INFO, "handleNackReceipt() from: " + from + ", messageId: " + messageId);
}

protected void handleControlMessage(Map<String, Object> jsonObject) {
    logger.log(Level.INFO, "handleControlMessage(): " + jsonObject);
String controlType = (String) jsonObject.get("control_type");
if ("CONNECTION_DRAINING".equals(controlType)) {
    connectionDraining = true;
} else {
    logger.log(Level.INFO, "Unrecognized control type: %s. This could"+
   " happen if new features are " + "added to the CCS protocol.", controlType);
    }
}

/**
 * Creates a JSON encoded GCM message.
 *
 * @param to RegistrationId of the target device (Required).
 * @param messageId Unique messageId for which CCS will send an
 *         "ack/nack" (Required).
 * @param payload Message content intended for the application. (Optional).
 * @param collapseKey GCM collapse_key parameter (Optional).
 * @param timeToLive GCM time_to_live parameter (Optional).
 * @param delayWhileIdle GCM delay_while_idle parameter (Optional).
 * @return JSON encoded GCM message.
 */
public static String createJsonMessage(String to, String messageId,
        Map<String, String> payload, String collapseKey, Long timeToLive,
        Boolean delayWhileIdle) {
    Map<String, Object> message = new HashMap<String, Object>();
    message.put("to", to);
if (collapseKey != null) {
    message.put("collapse_key", collapseKey);
}
if (timeToLive != null) {
    message.put("time_to_live", timeToLive);
}
if (delayWhileIdle != null && delayWhileIdle) {
    message.put("delay_while_idle", true);
    }
  message.put("message_id", messageId);
  message.put("data", payload);
  return JSONValue.toJSONString(message);
}

/**
 * Creates a JSON encoded ACK message for an upstream message received
 * from an application.
 *
 * @param to RegistrationId of the device who sent the upstream message.
 * @param messageId messageId of the upstream message to be acknowledged to CCS.
 * @return JSON encoded ack.
 */
protected static String createJsonAck(String to, String messageId) {
Map<String, Object> message = new HashMap<String, Object>();
message.put("message_type", "ack");
message.put("to", to);
message.put("message_id", messageId);
    return JSONValue.toJSONString(message);
}

/**
 * Connects to GCM Cloud Connection Server using the supplied credentials.
 *
 * @param senderId Your GCM project number
 * @param apiKey API Key of your project
 */
public void connect(long senderId, String apiKey) throws XMPPException, IOException, SmackException 
{
    ConnectionConfiguration config = new ConnectionConfiguration(GCM_SERVER, GCM_PORT);
    config.setSecurityMode(SecurityMode.enabled);
    config.setReconnectionAllowed(true);
    config.setRosterLoadedAtLogin(false);
    config.setSendPresence(false);
    config.setSocketFactory(SSLSocketFactory.getDefault());

    connection = new XMPPTCPConnection(config);
    connection.connect();

    connection.addConnectionListener(new LoggingConnectionListener());

    // Handle incoming packets
connection.addPacketListener(new PacketListener() 
{
    @Override
    public void processPacket(Packet packet)
    {
        logger.log(Level.INFO, "Received: " + packet.toXML());
Message incomingMessage = (Message) packet;
GcmPacketExtension gcmPacket = (GcmPacketExtension) incomingMessage.getExtension(GCM_NAMESPACE);
String json = gcmPacket.getJson();
try 
{
    @SuppressWarnings("unchecked")
    Map<String, Object> jsonObject = (Map<String, Object>) JSONValue.parseWithException(json);

    // present for "ack"/"nack", null otherwise
    Object messageType = jsonObject.get("message_type");

    if (messageType == null) {
        // Normal upstream data message
        handleUpstreamMessage(jsonObject);

        // Send ACK to CCS
        String messageId = (String) jsonObject.get("message_id");
        String from = (String) jsonObject.get("from");
        String ack = createJsonAck(from, messageId);
        send(ack);
    }
    else if ("ack".equals(messageType.toString())) 
    {     // Process Ack
          handleAckReceipt(jsonObject);
    }
    else if ("nack".equals(messageType.toString())) 
    {     // Process Nack
          handleNackReceipt(jsonObject);
    }
    else if ("control".equals(messageType.toString())) 
    {     // Process control message
          handleControlMessage(jsonObject);
    }
    else
    {
          logger.log(Level.WARNING, "Unrecognized message type (%s)", messageType.toString());
    }
}
catch (ParseException e) 
{
    logger.log(Level.SEVERE, "Error parsing JSON " + json, e);
} 
catch (Exception e) 
{
    logger.log(Level.SEVERE, "Failed to process packet", e);
        }
    }
}, new PacketTypeFilter(Message.class));

// Log all outgoing packets
connection.addPacketInterceptor(new PacketInterceptor()
{
    @Override
    public void interceptPacket(Packet packet) 
    {
        logger.log(Level.INFO, "Sent: {0}", packet.toXML());
    }
}, new PacketTypeFilter(Message.class));

connection.login(senderId + "@" + GCM_SERVER, apiKey);
    }

   /* public static void main(String[] args) throws Exception 
    {
        SmackCcsClient ccsClient = new SmackCcsClient();

        ccsClient.connect(senderId, password);
// Send a sample hello downstream message to a device.
        String toRegId ="APA91bHAxquB3kjk-VV5FY_dxgm1qYege0aepIZ7ZQ7rc8fPReiSPNCf5b7t5Hu4neKI7pf2Pl6P6D6M7zH17E9GJZmUV8Cu1BojlTTQQfM1IiZPomsxlyInZaZ5Qk6AP9qzAGz2oVVkC5zUZ5U2noERNxkUBqjfrw";
        String messageId = ccsClient.nextMessageId();
        Map<String, String> payload = new HashMap<String, String>();
        payload.put("Hello", "World");
        payload.put("CCS", "Dummy Message");
        payload.put("EmbeddedMessageId", messageId);
        String collapseKey = "sample";
        Long timeToLive = 10000L;
        String message = createJsonMessage(toRegId, messageId, payload, collapseKey, timeToLive, true);

        ccsClient.sendDownstreamMessage(message);
    }*/

public static void sendMessage() throws Exception
{
    SmackCcsClient ccsClient = new SmackCcsClient();

    ccsClient.connect(senderId, password);
// Send a sample hello downstream message to a device.
String toRegId ="APA91bHAxquB3kjk-VV5FY_dxgm1qYege0aepIZ7ZQ7rc8fPReiSPNCf5b7t5Hu4neKI7pf2Pl6P6D6M7zH17E9GJZmUV8Cu1BojlTTQQfM1IiZPomsxlyInZaZ5Qk6AP9qzAGz2oVVkC5zUZ5U2noERNxkUBqjfrw";
String messageId = ccsClient.nextMessageId();
Map<String, String> payload = new HashMap<String, String>();
payload.put("Hello", "World");
payload.put("CCS", "Dummy Message");
payload.put("EmbeddedMessageId", messageId);
String collapseKey = "sample";
    Long timeToLive = 10000L;
    String message = createJsonMessage(toRegId, messageId, payload, collapseKey, timeToLive, true);

    ccsClient.sendDownstreamMessage(message);
}
/**
 * XMPP Packet Extension for GCM Cloud Connection Server.
 */
private static final class GcmPacketExtension extends DefaultPacketExtension {

    private final String json;

    public GcmPacketExtension(String json) {
        super(GCM_ELEMENT_NAME, GCM_NAMESPACE);
        this.json = json;
    }

    public String getJson() {
        return json;
    }

    @Override
    public String toXML() {
        return String.format("<%s xmlns=\"%s\">%s</%s>",
                GCM_ELEMENT_NAME, GCM_NAMESPACE,
                StringUtils.escapeForXML(json), GCM_ELEMENT_NAME);
    }

    public Packet toPacket() {
        Message message = new Message();
        message.addExtension(this);
        return message;
    }
}

private static final class LoggingConnectionListener
        implements ConnectionListener {

    @Override
    public void connected(XMPPConnection xmppConnection) {
        logger.info("Connected.");
}

@Override
public void authenticated(XMPPConnection xmppConnection) {
    logger.info("Authenticated.");
}

@Override
public void reconnectionSuccessful() {
    logger.info("Reconnecting..");
}

@Override
public void reconnectionFailed(Exception e) {
    logger.log(Level.INFO, "Reconnection failed.. ", e);
}

@Override
public void reconnectingIn(int seconds) {
    logger.log(Level.INFO, "Reconnecting in %d secs", seconds);
}

@Override
public void connectionClosedOnError(Exception e) {
    logger.info("Connection closed on error.");
}

@Override
public void connectionClosed() {
    logger.info("Connection closed.");
        }
    }
}