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