var ls = require("lightstreamer-client");
var lsClient = new ls.LightstreamerClient("http://push.lightstreamer.com","DEMO");  
lsClient.connect();

var testSubscription = new ls.Subscription("MERGE",["item1","item2","item3"],["stock_name","last_price"]);
testSubscription.setDataAdapter("QUOTE_ADAPTER");
testSubscription.setRequestedSnapshot("yes");
lsClient.subscribe(testSubscription);

lsClient.addListener({
    onStatusChange: function(newStatus) {         
      console.log(newStatus);
    }
});
 
testSubscription.addListener({
    onSubscription: function() {
      console.log("SUBSCRIBED");
    },
    onUnsubscription: function() {
      console.log("UNSUBSCRIBED");
    },
    onItemUpdate: function(obj) {
      console.log(obj.getValue("stock_name") + ": " + obj.getValue("last_price"));
    }
});