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