Re: Telnet negotiation

[Scott Klement <rpg400-l@xxxxxxxxxxxxxxxx>]

Hi Jon,

I, too, have written my own Telnet client.  But, it has been many years, 
and I do not have the telnet negotiation codes memorized.  I suspect 
you'll have to go look them up in the RFCs.

The other thing to consider here is the terminal emulation that's in use 
here.  Telnet itself is only a starting point, and the Telnet standard 
only defines a simple NVT terminal.  From there, you are supposed to 
upgrade to another terminal emulation type such as ASCII terminals like 
VT220, or EBCDIC ones like the 5250 or 3270.

Stuff like "line mode" seems like it'd be more closely related to the 
terminal emulation than the telnet protocol itself...   at least, that's 
what I remember (but my memory is quite fuzzy).

-SK




On 12/5/2012 8:54 AM, Jon S wrote:
> All,
>
> I wrote my own Telnet Client in RPG several years ago and I have been asked to change it from character-at-a-time to line-at-a-time mode. I am sure this is done in the negotation string that I send back to the host. The following is what I received from my customer:
>
> "There is an understanding known as kludge-line mode, which means that if either "suppress go ahead" or "echo" is enabled but not both, then Telnet operates in line-at-a-time mode."
> I am not sure how to do this. Currently I am sending back
> request = X'FFFE03+
> FFFE01' + CRLF2
> but it's been so long ago that I don't even remember what that means.
>
> Can anyone help me out?
>
> Thanks, Jon