code: public static TcpServer<ByteBuf, ByteBuf> newServer(int port, EventLoopGroup eventLoopGroup,
                                                           Class<? extends ServerChannel> channelClass) {
          return newServer(port, eventLoopGroup, eventLoopGroup, channelClass);
      }
docs: Creates a new server using the passed port.
  
  @param port Port for the server. {@code 0} to use ephemeral port.
  @param eventLoopGroup Eventloop group to be used for server as well as client sockets.
  @param channelClass The class to be used for server channel.
  
  @return A new {@link TcpServer}