code: public boolean send(Socket socket, int flags)
      {
          Utils.checkArgument(socket != null, "socket parameter must be set");
          return socket.send(data, flags);
      }
docs: Internal method to call org.zeromq.Socket send() method.
  @param socket
  0MQ socket to send on
  @param flags
  Valid send() method flags, defined in org.zeromq.ZMQ class
  @return
  True if success, else False