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

[Frédéric BERNON]

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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-----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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