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