Re: 5250 telnet keepalive

Thanks Scott.

As I understand it,  your program sends a request to the terminal to send
the latest screen? How does it know which terminal to send it to? It
sounds like I could modify my bridge program to send the request to the
terminal but would the AS/400 know what to do with it?

Albert

  ----- Original Message -----
  From: "Scott Klement"
  To: "Midrange Systems Technical Discussion"
  Subject: Re: 5250 telnet keepalive
  Date: Tue, 20 Sep 2005 13:39:59 -0500 (CDT)



  > It works quite well except for the timeout problem. After 15
  > minutes or so of inactivity the connection just hangs and I have
  > to disconnect and reconnect.

  It "hangs"? Have you looked to see if something is wrong with your
  proxy program? Maybe it has a bug that's causing it to hang? I
  can't imagine that the connection hanging is a timeout problem.

  > I would like to know if there is some UDDS string (like a poll)
  that my
  > bridge program could send to either the AS/400 or the terminal
  emulation
  > program which would keep the connection alive but would not effect
  the
  > job in any way.

  Sure... just tell the terminal to send you the contents of the
  screen on a regular basis. You can use the signal APIs to send you
  a signal on a regular interval, and the DSM APIs (which I prefer
  over UDDS) to request the contents of the screen.

  I've been experimenting with writing an RPG program that works like
  an old MS-DOS TSR (Terminate and Stay Resident) program. This
  seems like a good application for something like that. You run the
  program. It does it's setup and then ends, but remains in memory.
  A signal wakes it up every second or so, and it reads the contents
  of the screen, causing the traffic to flow over the network.

  To give it a try, download the following code, and put it in the
  QRPGLESRC file on your iSeries:
  http://www.scottklement.com/rpg/traffic.zip

  Compile the program (requires V5R1 since it's written in free
  format):
  CRTBNDRPG TRAFFIC SRCFILE(mylib/QRPGLESRC) DBGVIEW(*LIST)

  Call the program:
  CALL TRAFFIC

  from here on, it'll read your screen every second. (Generating
  network traffic that should prevent inactivity from ever being a
  concern).

  When you want to stop it from polling your screen, type:
  RCLACTGRP TRAFFIC

  Good luck

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