diff --git a/web/ons-demo/js/controller.js b/web/ons-demo/js/controller.js
index fd3f6ae..929e21b 100644
--- a/web/ons-demo/js/controller.js
+++ b/web/ons-demo/js/controller.js
@@ -1,10 +1,13 @@
 /*global d3*/
 
-function callURL(url) {
+function callURL(url, cb) {
 	d3.text(url, function (error, result) {
 		if (error) {
 			alert(url + ' : ' + error.status);
 		} else {
+			if (cb) {
+				cb(result);
+			}
 			console.log(result);
 		}
 	});
@@ -37,6 +40,16 @@
 	delFlowCmd: function (flow) {
 		var url = '/proxy/gui/delflow/' + flow.flowId.value;
 		callURL(url);
+	},
+	startIPerfCmd: function (flow, duration, numSamples) {
+		var flowId = parseInt(flow.flowId.value, 16);
+		var url = '/proxy/guid/iperf/start/' + [flowId, duration, numSamples].join('/');
+		callURL(url)
+	},
+	getIPerfDataCmd: function (flow, cb) {
+		var flowId = parseInt(flow.flowId.value, 16);
+		var url = '/proxy/gui/iperf/rate/' + flowId;
+		callURL(url, cb);
 	}
 };
 
@@ -70,4 +83,12 @@
 
 function deleteFlow(flow) {
 	controllerFunctions.delFlowCmd(flow);
+}
+
+function startIPerf(flow, duration, numSamples) {
+	controllerFunctions.startIPerfCmd(flow, duration, numSamples);
+}
+
+function getIPerfData(flow, cb) {
+	controllerFunctions.getIPerfDataCmd(flow, cb);
 }
\ No newline at end of file