public void start() {
int port = 9191;
HttpServer server = vertx.createHttpServer();
SocketIOServer io = new DefaultSocketIOServer(vertx, server);
io.sockets().onConnection(new Handler<SocketIOSocket>() {
public void handle(final SocketIOSocket socket) {
socket.on("set nickname", new Handler<JsonObject>() {
public void handle(JsonObject name) {
System.out.println("name: " + name);
socket.set("nickname", name, new Handler<Void>() {