app.js

var app = app || {
  id:         "unique application instance id",
  session_id: "unique session id",
  render: function(){
    console.log("%c %s","font-size: 50px;color:yellow;", 
      "chat changed!");
    console.table(chat);
  }
};

// extend a Backbone.Collection
var SwarmChat = Swarm.Set.extend(Backbone.Collection); 

// create a Swarm Host 
app.host = new Swarm.Host(app.id+app.session_id);

// create a syncable Chat object
var chat = app.chat = new SwarmChat(app.id);

// initialize the collection
chat.on('.init', function(){/* do stuff */});

// subscribe on changes
chat.on('set', app.render);

// connect to the WebSocket endpoint;
app.host.connect('ws://<your-app>.swarmix.io/v1/websocket');