code: @Handler(channels = EncryptedChannel.class)
      public void onConnected(Connected event, IOSubchannel encryptedChannel) {
          new PlainChannel(event, encryptedChannel);
      }
docs: Creates a new downstream connection as {@link LinkedIOSubchannel}
  of the network connection together with an {@link SSLEngine}.
  
  @param event
  the accepted event