code: public EpollSocketChannelConfig setTcpNotSentLowAt(long tcpNotSentLowAt) {
          try {
              ((EpollSocketChannel) channel).socket.setTcpNotSentLowAt(tcpNotSentLowAt);
              return this;
          } catch (IOException e) {
              throw new ChannelException(e);
          }
      }
docs: Set the {@code TCP_NOTSENT_LOWAT} option on the socket. See {@code man 7 tcp} for more details.
  @param tcpNotSentLowAt is a uint32_t