Here is a snippet of my server code that I use with Firebase. If you want to understand in more detail try this blog post (it is how I figured out how to get everything to work in the end): http://www.grokkingandroid.com/xmpp-server-google-cloud-messaging/
In order to get the code below to work you will need to go to the Firebase console and go to project settings
![enter image description here]()
From here you will need to take note of your Server Key and Sender ID and replace it in the code snippet below (it is near the bottom of the code) and save it in your path as SmackCcsClient.class
![enter image description here]()
After doing that you can compile and run your server through the command promt:
// Set up java file (replace PATH_TO_WHERE_YOUR_CLASS_IS with your own path and make sure to put the json and smack JARs there as well
javac -d PATH_TO_WHERE_YOUR_CLASS_IS -sourcepath src -cp PATH_TO_WHERE_YOUR_CLASS_IS\json-simple-1.1.1.jar;PATH_TO_WHERE_YOUR_CLASS_IS\smack-3.4.1-0cec571.jar PATH_TO_WHERE_YOUR_CLASS_IS\SmackCcsClient.java
// Run
java -cp PATH_TO_WHERE_YOUR_CLASS_IS;PATH_TO_WHERE_YOUR_CLASS_IS\json-simple-1.1.1.jar;PATH_TO_WHERE_YOUR_CLASS_IS\smack-3.4.1-0cec571.jar SmackCcsClient
/*
SmackCcsClient:
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.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.util.StringUtils;
import org.json.simple.JSONValue;
import org.json.simple.parser.ParseException;
import org.xmlpull.v1.XmlPullParser;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.io.*;
import javax.net.ssl.SSLSocketFactory;
/**
* Sample Smack implementation of a client for GCM Cloud Connection Server.
*
* For illustration purposes only.
*/
public class SmackCcsClient {
static final String REG_ID_STORE = "gcmchat.txt";
static final String MESSAGE_KEY = "SM";
Logger logger = Logger.getLogger("SmackCcsClient");
public static final String GCM_SERVER = "fcm-xmpp.googleapis.com";
public static final int GCM_PORT = 5235;
public static final String GCM_ELEMENT_NAME = "gcm";
public static final String GCM_NAMESPACE = "google:mobile:data";
static Random random = new Random();
XMPPConnection connection;
ConnectionConfiguration config;
/**
* XMPP Packet Extension for GCM Cloud Connection Server.
*/
class GcmPacketExtension extends DefaultPacketExtension {
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, json, GCM_ELEMENT_NAME);
}
@SuppressWarnings("unused")
public Packet toPacket() {
return new Message() {
// Must override toXML() because it includes a <body>
@Override
public String toXML() {
StringBuilder buf = new StringBuilder();
buf.append("<message");
if (getXmlns() != null) {
buf.append(" xmlns=\"").append(getXmlns()).append("\"");
}
if (getLanguage() != null) {
buf.append(" xml:lang=\"").append(getLanguage())
.append("\"");
}
if (getPacketID() != null) {
buf.append(" id=\"").append(getPacketID()).append("\"");
}
if (getTo() != null) {
buf.append(" to=\"")
.append(StringUtils.escapeForXML(getTo()))
.append("\"");
}
if (getFrom() != null) {
buf.append(" from=\"")
.append(StringUtils.escapeForXML(getFrom()))
.append("\"");
}
buf.append(">");
buf.append(GcmPacketExtension.this.toXML());
buf.append("</message>");
return buf.toString();
}
};
}
}
public SmackCcsClient() {
// Add GcmPacketExtension
ProviderManager.getInstance().addExtensionProvider(GCM_ELEMENT_NAME,
GCM_NAMESPACE, new PacketExtensionProvider() {
@Override
public PacketExtension parseExtension(XmlPullParser parser)
throws Exception {
String json = parser.nextText();
GcmPacketExtension packet = new GcmPacketExtension(json);
return packet;
}
});
}
/**
* 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 getRandomMessageId() {
return "m-" + Long.toString(random.nextLong());
}
/**
* Sends a downstream GCM message.
*/
public void send(String jsonRequest) {
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 process an upstream message.
*/
public void handleIncomingDataMessage(Map<String, Object> jsonObject) {
String from = jsonObject.get("from").toString();
// PackageName of the application that sent this message.
String category = jsonObject.get("category").toString();
// Use the packageName as the collapseKey in the echo packet
String collapseKey = "echo:CollapseKey";
@SuppressWarnings("unchecked")
Map<String, String> payload = (Map<String, String>) jsonObject
.get("data");
String messageText = payload.get("message_text");
String messageFrom = payload.get("message_userfrom");
String messageTime = payload.get("message_timestamp");
String toUser = payload.get("message_recipient");
payload.put("message_text", messageText);
payload.put("message_userfrom", messageFrom);
payload.put("message_timestamp", messageTime);
String message = createJsonMessage(toUser, getRandomMessageId(),
payload, collapseKey, null, false);
send(message);
}
/**
* Handles an ACK.
*
* <p>
* By default, it only logs a INFO message, but subclasses could override it
* to properly handle ACKS.
*/
public void handleAckReceipt(Map<String, Object> jsonObject) {
String messageId = jsonObject.get("message_id").toString();
String from = jsonObject.get("from").toString();
logger.log(Level.INFO, "handleAckReceipt() from: " + from
+ ", messageId: " + messageId);
}
/**
* Handles a NACK.
*
* <p>
* By default, it only logs a INFO message, but subclasses could override it
* to properly handle NACKS.
*/
public void handleNackReceipt(Map<String, Object> jsonObject) {
String messageId = jsonObject.get("message_id").toString();
String from = jsonObject.get("from").toString();
logger.log(Level.INFO, "handleNackReceipt() from: " + from
+ ", messageId: " + messageId);
}
/**
* 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.
*/
public 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 username
* [email protected]
* @param password
* API Key
* @throws XMPPException
*/
public void connect(String username, String password) throws XMPPException {
config = new ConnectionConfiguration(GCM_SERVER, GCM_PORT);
config.setSecurityMode(SecurityMode.enabled);
config.setReconnectionAllowed(true);
config.setRosterLoadedAtLogin(false);
config.setSendPresence(false);
config.setSocketFactory(SSLSocketFactory.getDefault());
// NOTE: Set to true to launch a window with information about packets
// sent and received
config.setDebuggerEnabled(true);
// -Dsmack.debugEnabled=true
XMPPConnection.DEBUG_ENABLED = true;
connection = new XMPPConnection(config);
connection.connect();
connection.addConnectionListener(new ConnectionListener() {
@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.log(Level.INFO, "Connection closed on error.");
}
@Override
public void connectionClosed() {
logger.info("Connection closed.");
}
});
// 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
handleIncomingDataMessage(jsonObject);
// Send ACK to CCS
String messageId = jsonObject.get("message_id")
.toString();
String from = jsonObject.get("from").toString();
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 {
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, "Couldn't send echo.", 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(username, password);
}
public void writeToFile(String name, String regId) throws IOException {
Map<String, String> regIdMap = readFromFile();
regIdMap.put(name, regId);
PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(
REG_ID_STORE, false)));
for (Map.Entry<String, String> entry : regIdMap.entrySet()) {
out.println(entry.getKey() + "," + entry.getValue());
}
out.println(name + "," + regId);
out.close();
}
public Map<String, String> readFromFile() {
Map<String, String> regIdMap = null;
try {
BufferedReader br = new BufferedReader(new FileReader(REG_ID_STORE));
String regIdLine = "";
regIdMap = new HashMap<String, String>();
while ((regIdLine = br.readLine()) != null) {
String[] regArr = regIdLine.split(",");
regIdMap.put(regArr[0], regArr[1]);
}
br.close();
} catch(IOException ioe) {
}
return regIdMap;
}
public static void main(String [] args) {
final String userName = "Sender ID" + "@gcm.googleapis.com";
final String password = "Server key";
SmackCcsClient ccsClient = new SmackCcsClient();
try {
ccsClient.connect(userName, password);
} catch (XMPPException e) {
e.printStackTrace();
}
}
}
