Sample node.js server code to implement an XMPP server that will integrate with Android's Google Cloud Messaging (GCM) "device to cloud" message functionality - CCS. This sample only receives upstream messages (i.e. from the device).

gcmcss.js

var xmpp = require('node-xmpp');

//Set node-xmpp options.
//Replace with your projectID in the jid and your API key in the password
//The key settings for CCS are the last two to force SSL and Plain SASL auth.
var options = {
  type: 'client',
  jid: 'XXXXXXXXX@gcm.googleapis.com',
  password: 'XXXXXXXX',
  port: 5235,
  host: 'gcm.googleapis.com',
  legacySSL: true,
  preferredSaslMechanism : 'PLAIN'
};

console.log('creating xmpp app');

var cl = new xmpp.Client(options);
cl.on('online',
  function() {
    console.log("online");
  });

cl.on('stanza',
  function(stanza) {
    if (stanza.is('message') &&
        // Best to ignore an error
        stanza.attrs.type !== 'error') {

      console.log("Message received");
      
      //Message format as per here: https://developer.android.com/google/gcm/ccs.html#upstream
      var messageData = JSON.parse(stanza.getChildText("gcm"));

      if (messageData && messageData.message_type != "ack" && messageData.message_type != "nack") {

        var ackMsg = new xmpp.Element('message').c('gcm', { xmlns: 'google:mobile:data' }).t(JSON.stringify({
          "to":messageData.from,
          "message_id": messageData.message_id,
          "message_type":"ack"
        }));
        //send back the ack.
        cl.send(ackMsg);
        console.log("Sent ack");

        //Now do something useful here with the message
        //e.g. awesomefunction(messageData);
        //but let's just log it.
        console.log(messageData);

      } else {
        //Need to do something more here for a nack.
        console.log("message was an ack or nack...discarding");
      }

    } else {
      console.log("error");
      console.log(stanza)
    }

  });

cl.on('error',
 function(e) {
   console.log("Error occured:");
   console.error(e);
   console.error(e.children);
 });