[lwip-users] Re:TCP transmission error

[boter]

Hi all,

   Firstly thanks for Richard's reply.  yes, I am using lwip on the 
AT91SAM7X256.
The TCP server is based on the demo lwip_Demo_Rowley_ARM7 from FreeRTOS 
v3.2.2,
I also think  I should free the memory. but how can I do it.  now I list 
the important program lines

     while((pxRxBuffer = netconn_recv( pxNetCon )) != NULL)
     {
           netbuf_data(pxRxBuffer, ( void * ) &pcRxString, &usLength);
           netconn_write(pxNetCon, pcRxString, usLength, NETCONN_COPY);
     }
part of program above is loop .
while((pxRxBuffer = netconn_recv( pxNetCon )) != NULL) ,this line will wait 
for a new
incoming data , netbuf_data(pxRxBuffer, ( void * ) &pcRxString, &usLength); 
this line will
obtain the payload.  netconn_write(pxNetCon, pcRxString, usLength, 
NETCONN_COPY);
this line will write back the payload , how can I free the memory . should I 
use the netbuf_delete()
to free the memory ?

thanks
Boter
Dec 30, 2005

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Sent: Thursday, December 29, 2005 8:42 AM
Subject: lwip-users Digest, Vol 28, Issue 27


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>   1. Server Program in Raw API without OS
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>   2. TCP  transmission error (boter)
>   3. Re: TCP  transmission error (FreeRTOS Info)
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> Date: Thu, 29 Dec 2005 10:38:20 +0800 (CST)
> From: =?big5?q?=B3=AF=20=A4p=BE=D6?= <address@hidden>
> Subject: [lwip-users] Server Program in Raw API without OS
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> Hi all:
>      I am going to do a project using LwIP without OS . my program can 
> transmited data yet . However , my tutor ask me to let the program can 
> process multi-connection .  My question is that
>  1.  How can i record that connection ? can i use a array(struct 
> tcp_pcb[]) after
>       listen() ?
>  2. If using array can work , How can i handle the closing ?
>
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> Message: 2
> Date: Thu, 29 Dec 2005 18:52:42 -0800
> From: "boter" <address@hidden>
> Subject: [lwip-users] TCP  transmission error
> To: "lwip-users" <address@hidden>
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>
> Hi all,
>
>    I  writed  a simple TCP-server program base on Rowley webserver demo 
> using lwip.
> the server function is that transmit back what it received.  when the 
> function netconn_recv()
> is executed the fifth time ,the error will occur . I traced the program . 
> I found the case is the
> function netconn_recv() cann't obtain memory for the new incoming data. 
> (the return of
> buf = memp_malloc(MEMP_NETBUF) in netconn_recv() function is NULL) . so 
> the server
> program cann't receive incoming data again.  I changed MEM_SIZE  from 2000 
> to 4000 ,but
> the result is  same. if anyone need the source code ,please email to me . 
> or anybody send
> me your successful program of TCP communication. let me appreciate your 
> experience.
>    My email address : address@hidden
>
> Thanks
> Boter
> 29 Dec, 2005
>
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> ------------------------------
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> Message: 3
> Date: Thu, 29 Dec 2005 12:35:56 -0000
> From: "FreeRTOS Info" <address@hidden>
> Subject: Re: [lwip-users] TCP  transmission error
> To: "Mailing list for lwIP users" <address@hidden>
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset="gb2312"
>
> >    I  writed  a simple TCP-server program base on Rowley webserver demo
> using lwip.
>
> For ARM?
>
> > the server function is that transmit back what it received.  when the
> function netconn_recv()
> > is executed the fifth time ,the error will occur .
>
> Sounds like you are not freeing memory correctly.
>
> > or anybody send
> > me your successful program of TCP communication.
> > let me appreciate your experience.
>
> I don't know if this is what you have seen already - but the FreeRTOS.org
> WEB site (link below) has an lwIP server demo also using Rowley tools. 
> May
> help.
>
> Regards,
> Richard.
>
> http://www.FreeRTOS.org
>
>
>
>
>
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