Re: [lwip-users] lwIP 1.3.x and tcp socket disconnects in the ESTABLISHED state

[Simon Goldschmidt]

In the past, such things as errors depending on timing (which also could be why 
full debug doesn't work) mostly were errors in the port or driver like more 
than one thread working in the lwIP core at the same time.

You should check your port and driver for correctness first. Of course it could 
also be a bug in lwIP, but things like "I cannot turn on all TCP debug as this 
will cause the stack not to work at all" are highly suspicious of threading 
problems!

Simon



Dustin Stahlback wrote:
> Gentleman,
> 
> I have the following setup:
> 
> lwIP 1.3.0.x (latest CVS), freeRTOS 5.0.0, AT91SAM7X256
> 
> I use the PPP driver to interface to analog and wireless modems.
> 
> 
> I am looking for some advice an trying to track down an issue while
> recieving data from a TCP socket using the netconn api.
> 
> 
> I have a specific file (random data padded with 230K+ bytes of 0xFF).
> Sometimes, this file transfer causes the TCP socket to close and send
> the FIN packet even though the file has not finished being received.
> The state the TCP socket is in is ESTABLISHED when the socket closes,
> whereas on a proper functioning file transfer, the socket closes in the
> state CLOSE_WAIT.  This was determined from the tcp_debug_print_state()
> mechanism.  The stats_display() indicates that I have allocated enough
> resources for this specific task so I believe I have a decent lwipopts.h
> setup.  I can decrease the failure rate by enabling a debug statement
> (2ms to printout) in the function tcp_process() under the ESTABLISHED
> case.  I cannot turn on all TCP debug as this will cause the stack not
> to work at all.
> 
> If you have any ideas I would appreciate them.
> 
> Thanks,
> 
> Dustin
> 
> 
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