Re: [lwip-users] LWIP stops responding on Ping and HTTP calls from a browser

[Ruben]

Hi Kieran

It is strange but UDP frames are not blocking and keep on beeing processed by the stack but TCP not.
in the function ip_input at "switch (IPH_PROTO(iphdr)) " the UDP case it called but the TCP case us never called untill I wait a while and refresh my broser. and if i am lucky the tcp frame is decoded and the browser display a webpage.

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From: address@hidden
To: address@hidden
Date: 10:23:19, 04.26.2011
Subject: Re: [lwip-users] LWIP stops responding on Ping and HTTP calls from a browser
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>>On Fri, 2011-04-22 at 10:52 +0200, Ruben van der Kraan wrote:
>>
>> > After a boot of the software everything works ok. I can Ping, acces
>> > the webserver pages, open the telnet server.
>> > But at a point the websever and ping stop working. In wireshark i see
>> > my PC sending request to the embedded device
>> > a STM32F217 but the stack does not send a respons.
>>
>> Such problems almost always turn out to be a bug in the port or
>> application where they're violating lwIP's threading constraints,
>> resulting in more than one thread active in lwIP at one time, and so
>> corruption of some state which leads something to get stuck in an
>> infinite loop and the sort of problems you describe.
>>
>> Kieran
>>
>>
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>>
>>