[DGD] Sending telnet KEEPALIVE packets

[Petter Nyström]

As a workaround, perhaps you could use the one telnet command DGD can
send: the ECHO request. By using send_message(0) and send_message(1)
you'll send WONT ECHO and DO ECHO, respectively. If you keep track of
the user's supposed ECHO state you could resend the proper requests
just to keep the connection alive, perhaps?

Maybe this hack is a big no-no, I wouldn't know. Just an idea for you.

I believe I am using some ANSI escape that also basically should have
no effect on the client, but since DGD doesn't support ANSI out of the
box, that's one step further to take and probably not any better than
spamming ECHO requests.

Regards,

Jimorie

On 7/20/07, Felix A. Croes <felix at dworkin.nl> wrote:
> "Kurt Nordstrom" <kurt at blar.net> wrote:
>
> > I've been asked by a user with a wonky connection if I could have the Mud
> > send them a periodic keepalive packet to avoid timing out.  I thought I'd
> > ask here about the best ways to do this.  I had a few questions:
> >
> > - Is the keepalive character something a stock DGD driver will allow to go
> > through, or am I gonna have to hack around in comm.c again?
>
> As far as I know, telnet does not actually have a "keepalive character".
> What is usually done is to send IAC NOP.  Some telnet clients can be
> configured to send this periodically, and DGD will do the proper thing
> in response, that is, it will ignore it.
>
>
> > - Assuming I can send it with the driver, how would I specify this
> > sequence in LPC?  Is there an escape code for it?
>
> DGD cannot send it.  Of course, you're free to modify comm.c to send
> periodical IAC NOPs; hopefully, not too many clients will crash as a
> result.
>
> Regards,
> Dworkin
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