remctl_noop - Send a NOOP message to a remctl server

       Russ Allbery <eagle@eyrie.org>

       This interface was added in version 3.0.

       Copyright 2011, 2014 The Board of Trustees of the Leland Stanford Junior University

       Copying and distribution of this file, with or without modification, are permitted in any medium without
       royalty provided the copyright notice and this notice are preserved.  This file is offered as-is, without
       any warranty.

       SPDX-License-Identifier: FSFAP

remctl_noop() sends a NOOP message to a remctl server and reads the expected NOOP response.  This is
       primarily used to keep a connection to a remctl server alive, such as through a firewall with a session
       timeout, while waiting to issue further commands.

       The NOOP message requires protocol version 3 support in the server, so the caller should be prepared for
       this function to fail, indicating that the connection could not be kept alive and possibly that it was
       closed by the server.  In this case, the client will need to explicitly reopen the connection with
       remctl_open().

       remctl_noop - Send a NOOP message to a remctl server

remctl_noop() returns true on success and false on failure.  On failure, the caller should call
       remctl_error() to retrieve the error message.  In addition to network errors, this function may fail if
       the server doesn't support protocol version 3.

remctl_new(3), remctl_open(3), remctl_command(3), remctl_error(3)

       The current version of the remctl library and complete details of the remctl protocol are available from
       its web page at <https://www.eyrie.org/~eagle/software/remctl/>.

3.18                                               2022-05-09                                     REMCTL_NOOP(3)

       #include <remctl.h>

       int remctl_noop(struct remctl *r);