diff --git a/www/main.html b/www/main.html
index df3739b..88fa897 100644
--- a/www/main.html
+++ b/www/main.html
@@ -117,10 +117,14 @@
         <script>
             var fs;
 
+            function callbackData(data) {
+                console.log(data);
+            }
+
             function connect() {
                 fs = new FLYSocket(
                     addr.value, // websocket addr
-                    // callbackData
+                    callbackData
                     // callbackRaw
                     );
             }