Objective-C

Send a POP3 NOOP Command

Demonstrates the Chilkat MailMan.Pop3Noop method, which sends a POP3 NOOP command to the server. NOOP does nothing except elicit a positive response, which is useful for keeping a session alive or verifying the connection is still responsive. This example begins a POP3 session and sends a NOOP.

Background: NOOP ("no operation") is a standard keep-alive across many internet protocols. Servers often drop idle connections after a timeout; sending a periodic NOOP resets that timer so a long-running session stays open. It also serves as a cheap "are you still there?" probe — a successful reply confirms the socket and the authenticated session are still healthy.

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Objective-C

#import <CkoMailMan.h>

BOOL success = NO;

//  Demonstrates the MailMan.Pop3Noop method, which sends a POP3 NOOP command to the server.
//  NOOP does nothing except elicit a positive response, which is useful for keeping a
//  session alive or verifying the connection is still responsive.

CkoMailMan *mailman = [[CkoMailMan alloc] init];

//  Configure the POP3 server connection.
mailman.MailHost = @"pop.example.com";
mailman.MailPort = [NSNumber numberWithInt:995];
mailman.PopSsl = YES;
mailman.PopUsername = @"user@example.com";
mailman.PopPassword = @"myPassword";

//  Begin a POP3 session.

success = [mailman Pop3BeginSession];
if (success == NO) {
    NSLog(@"%@",mailman.LastErrorText);
    return;
}

//  Send a NOOP to keep the session alive.
success = [mailman Pop3Noop];
if (success == NO) {
    NSLog(@"%@",mailman.LastErrorText);
    return;
}

NSLog(@"%@",@"POP3 NOOP succeeded.");