Re: [lwip-users] RE : RE : tcp_write() problem from outside callbacksfunctions

[Yann Suisini]

Merci d'avoir pointé avec Kieran ce problème. C'est effectivement a ce niveau
que j'ai fais une mauvaise interprétation du fonctionnement !


Frédéric BERNON wrote:
> 
> Are you sure you don't try to write on the listen pcb, and not on the
> "accepted" pcb ? Do you have read "18.2 Directly interfacing the stack" in
> the old "Design and Implementation of the lwIP TCP/IP Stack" pdf file? 
>   
> ====================================
> Frédéric BERNON 
> HYMATOM SA 
> Chef de projet informatique 
> Microsoft Certified Professional 
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> P Avant d'imprimer, penser à l'environnement
>  
> 
> 
> -----Message d'origine-----
> De : address@hidden
> [mailto:address@hidden De la
> part de Yann Suisini
> Envoyé : jeudi 5 avril 2007 15:46
> À : address@hidden
> Objet : Re: [lwip-users] RE : tcp_write() problem from outside
> callbacksfunctions
> 
> 
> 
> Hello ,
> 
> I had just get the tcp_pcb  state just before the tcp_write in my main
> loop and in the callback function. In the main : state=1 (LISTEN) in the
> callback : state=4 (ESTABLISHED) 
> 
> It seems more and more strange to me ...
> 
> 
> 
> 
> 
> Frédéric BERNON wrote:
>> 
>> It seems that only possible ERR_CONN cause is you call tcp_write with 
>> a connection in a invalid state. Can you tell us what is the 
>> "tcpweb->state" value when you call tcp_write ?
>> 
>> ====================================
>> Frédéric BERNON
>> HYMATOM SA 
>> Chef de projet informatique 
>> Microsoft Certified Professional 
>> Tél. : +33 (0)4-67-87-61-10 
>> Fax. : +33 (0)4-67-70-85-44 
>> Email : address@hidden 
>> Web Site : http://www.hymatom.fr 
>> ====================================
>> P Avant d'imprimer, penser à l'environnement
>>  
>> 
>> 
>> -----Message d'origine-----
>> De : address@hidden
>> [mailto:address@hidden De 
>> la part de Yann Suisini Envoyé : jeudi 5 avril 2007 14:51
>> À : address@hidden
>> Objet : Re: [lwip-users] tcp_write() problem from outside callbacks
>> functions
>> 
>> 
>> 
>> In fact I didn't put the connection part in the previous mail but the 
>> connection is ok :) (the tcp_new/tcp_bind:tcp_listen/tcp_accept 
>> sequence). Once the connection is established the tcp_write data frome 
>> the callbacks are sent well . But the tcp_write from the main loop 
>> that you can see in the source always return the ERR_CON .  I read  2 
>> or 3 times the rawapi.txt . But I probably missed something :(
>> 
>> 
>> 
>> 
>> Kieran Mansley wrote:
>>> 
>>> On Thu, 2007-04-05 at 09:57 +0000, Yann Suisini wrote:
>>>> At the first tcp_write , it's right that I'm not connected soe
>>>> ERR_CON is ok . But even when I'm connected after, the ERR_CON is 
>>>> always returned . I really don't know what I'm doing wrong.
>>> 
>>> When do you establish the connection? I can only see calls to
>>> tcp_write (), not to 
>>> tcp_new()/tcp_bind()/tcp_listen()/tcp_accept()/tcp_connect()
>>> - at least some of these are required.  I suggest having a read of
>>> lwip/doc/rawapi.txt
>>> 
>>> Kieran
>>> 
>>> 
>>> 
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>>> 
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