Perl

Send an FTP NOOP (Keep-Alive)

Demonstrates the Chilkat Ftp2.Noop method, which sends the FTP NOOP command. It takes no arguments and succeeds only when the server returns a positive reply.

Background: NOOP asks the server to do nothing and simply reply, which makes it the standard keep-alive: sending one periodically resets the server's idle timer so a long-running job does not lose its control connection between transfers. Because it exercises a real request/reply round trip, a successful NOOP is also firmer evidence the connection is alive than CheckConnection.

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use strict;
use warnings;
use Chilkat2;

# Demonstrates the Ftp2.Noop method, which sends the FTP NOOP command.  It takes no arguments.
# The server must return a positive reply for the method to succeed.

my $ftp = Chilkat2::Ftp2->new;

$ftp->Hostname('ftp.example.com');
$ftp->Username('myFtpLogin');

# Normally you would not hard-code the password in source.  You should instead obtain it
# from an interactive prompt, environment variable, or a secrets vault.
$ftp->Password('myPassword');

# Connect and log in (Connect performs both).
my $success = $ftp->Connect();
if (!$success) {
    print $ftp->LastErrorText, "\n";
    exit;
}

# NOOP does nothing on the server, but a successful reply confirms the control connection is
# still responsive -- useful as a keep-alive during an otherwise idle session.
$success = $ftp->Noop();
if (!$success) {
    print $ftp->LastErrorText, "\n";
    exit;
}

print "NOOP acknowledged by the server.\n";

$success = $ftp->Disconnect();
if (!$success) {
    print $ftp->LastErrorText, "\n";
    exit;
}