code: public static SocketUDT socketUDT(final Channel channel) {
          final ChannelUDT channelUDT = channelUDT(channel);
          if (channelUDT == null) {
              return null;
          } else {
              return channelUDT.socketUDT();
          }
      }
docs: Expose underlying {@link SocketUDT} for debugging and monitoring.
  <p>
  @return underlying {@link SocketUDT} or null, if parameter is not
  {@link UdtChannel}