code: public final UdpServer doOnBind(Consumer<? super Bootstrap> doOnBind) {
  		Objects.requireNonNull(doOnBind, "doOnBind");
  		return new UdpServerDoOn(this, doOnBind, null, null);
  
  	}
docs: Setup a callback called when {@link io.netty.channel.Channel} is about to
  bind.
  
  @param doOnBind a consumer observing server start event
  
  @return a new {@link UdpServer}