Re: [lwip-users] TCP KeepAlive

[Kelly_C]

Hi Martin,

Do you mind sharing the "sys_arch.c" file that you have adapted for lwIP
1.4.0 and AVR32?  I (and likely many others) would find it exceedingly
valuable!  Thanks.

-Kelly


Martin Persich wrote:
> 
> Hi, there is a quite old Atmel's bug (aprox one year ago was discussed in
> LwIP forum) . Both the timers (slow, fast) are started from the wrong task
> and dont work anyway. Please upgrade to last version of LwIP (1.4.0) and
> Atmel AVR32 library V 1.7. I had the same problems with old version. I'm
> using LwIP 1.3.2 with many, many updates from CVS (nearly version 1.4.0)
> and my "LwIP V 1.4.0 - ready" adapted port file "sys_arch.c" on AVR32 MCU
> (IAR EWAVR32 compiler) without problems.
> Best Regards
> Martin Persich
> 
>   ----- Original Message -----
>   From: farid mahini
>   To: Mailing list for lwIP users
>   Sent: Tuesday, September 21, 2010 1:37 AM
>   Subject: Re: [lwip-users] TCP KeepAlive
> 
> 
>   Upon accepting a client connection, I set the following socket options:
> 
>   - SOF_KEEPALIVE
>   - TCP_KEEPIDLE
>   - TCP_KEEPINTVL
> 
>   - TCP_KEEPCNT
> 
> 
> 
>   I have also set LWIP_TCP_KEEPALIVE =  1 and have verified that
> lwip_setsockopt_internal is populating the appropriate registers. What
> puzzles me is that neither slow or fast timer are firing which is where
> KeepAlive action is detected and performed !
> 
> 
> 
>   I am using lwIP 1.3.0 which is what AVR32 Studio had shipped.
> 
> 
> 
>   Thanx,
> 
>   -FM
> 
> 
> 
> 
> 
> 
> ------------------------------------------------------------------------------
>   From: Jeff Barber <address@hidden>
>   To: Mailing list for lwIP users <address@hidden>
>   Sent: Mon, September 20, 2010 2:38:21 PM
>   Subject: Re: [lwip-users] TCP KeepAlive
> 
>   On Mon, Sep 20, 2010 at 10:07 AM, farid mahini <address@hidden>
> wrote:
>   > I am trying to enable KeepAlive/Idle feature, but I do not see a hit
> on
>   > tcp_tmr, tcp_slowtmr, tcp_fasttmr on an established connection!  I am
> using
>   > lwIP 1.3 with FreeRTOS. I do not see the KeepAlive variables being
> accessed
>   > anywhere else. Any ideas on what I may have overlooked?
> 
>   I am using keepalives and they do work.  I'm using lwip version 1.3.2.
>   Here are a few notes that may help.
> 
>   The keepalive packet is sent in tcp_slowtmr when appropriate (assuming
>   the SOF_KEEPALIVE flag is set).  The eventual timeout is also
>   determined by that function when the limit of keepalives to be sent is
>   reached.  The per-session tick counter is set to the current global
>   tick counter value in tcp_process whenever a packet is received on a
>   given session, and the keep_alive_sent count is reset to zero at the
>   same time.
> 
>   I found the documentation for the keepalive variables to be a bit
>   unclear.  Bottom line is that (by default) the first keepalive is sent
>   when there has been no activity on the session for
>   TCP_KEEPIDLE_DEFAULT milliseconds, then a new keepalive is sent every
>   TCP_KEEPINTVL_DEFAULT milliseconds until a total of
>   TCP_KEEPCNT_DEFAULT probes have been sent.  At that point, the session
>   is closed.
> 
>   The default settings are such that the first keepalive is not sent
>   until two hours of inactivity, then 9 keepalives are sent spaced 75
>   seconds apart.  These were much too large for what I wanted: I have a
>   backplane ethernet between two closely-coupled systems and need to
>   detect loss of peer relatively quickly.  I reduced them to 10 seconds
>   for the first keepalive, then 9 more probes sent two seconds apart.
>   (This is also *much* easier to test since you don't have to wait
>   around for two+ hours to see your session timeout. :-)
> 
>   Note that the setsockopts API also lets you set the values of these,
>   but in that case they are specified in seconds, not milliseconds.
> 
>   Jeff
> 
>   _______________________________________________
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>   http://lists.nongnu.org/mailman/listinfo/lwip-users
> 
> 
> 
> 
> 
> ------------------------------------------------------------------------------
> 
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