JSDoc for extra/

Signed-off-by: Matthew Nickson <mnickson@sidingsmedia.com>

extra/simple-mqtt-server.js

@@ -11,6 +11,7 @@ class SimpleMqttServer {
         this.port = port;
     }
 
+    /** Start the MQTT server */
     start() {
         this.server.listen(this.port, () => {
             console.log("server started and listening on port ", this.port);