Re: [lwip-users] HTTP server help needed

[Navcon - Pedro Paulo Santos]

Hi Stojan,

No, I created my own HTTP handler code, but I have an example of one made by 
Luminary Micro. My version is much more simple. I just process the HTTP 
packeges in tcp_recv callback function. Depending on what is the client 
looking for, I create a different amont of data an concatenate it with the 
HTTP header I wrote in memory, and then I send it with tcp_write (). I just 
had to put (and I'm still puting) some effort in the way the big packages 
are transmitted, because I want to avoid Nagle's algoritm (I have low 
memory).

Regards,
Pedro Paulo.



----- Original Message ----- 
From: "Stojan Kovacevic" <address@hidden>
To: <address@hidden>
Sent: Wednesday, April 07, 2010 4:30 AM
Subject: [lwip-users] HTTP server help needed


Hi,
I need some help setting up an http server, since you 've got it
working. First, have you used http files from /contrib folder? Second,
did you make a special thread for it, or does it use tcpip_thread?

Thanks in advance,
Stojan Kovacevic

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>    1. lwIP malloc fail (Navcon - Pedro Paulo Santos)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Tue, 6 Apr 2010 12:38:19 -0300
> From: "Navcon - Pedro Paulo Santos" <address@hidden>
> Subject: [lwip-users] lwIP malloc fail
> To: <address@hidden>
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi all!
>
> I'm having a problem in trying to make a system with lwIP that sends a 
> large file with TCP from an external serial Flash memory.
>
> I use the following logic: read certain amont of data from the external 
> memory, send over TCP with tcp_write (), read more data, send again, and 
> there goes on. I made a function to handle lack of memory because of 
> Nagle's algoritm (because I have little memory and can't prepare a large 
> TCP message), and use tcp_output () to force the send of the amont of 
> data. The problem is that after some transfers (no more than 15 tcp 
> transfers) the program doesn't find memory to alloc in the following lines 
> of tcp_enqueue () function:
>
>     /* Allocate memory for tcp_seg, and fill in fields. */
>     seg = memp_malloc(MEMP_TCP_SEG);
>     if (seg == NULL) {
>       LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 2, ("tcp_enqueue: could not allocate 
> memory for tcp_seg\n"));
>       goto memerr;
>     }
>
> In my thinking, the tcp_output () function should free memory for the 
> further transfers so that I can transfer any amont of data if I make a lot 
> of consecutive "small" transfers.
>
> It occurs even if I send really small messages, with 20 bytes, for 
> example. I already tried to edit lwipopts.h raising TCP_SND_BUF, TCP_WND, 
> TCP_MSS, PBUF_POOL_SIZE, MEM_SIZE... but I got no good results.
>
> Do I have to free memory, myself, in any part of the lwIP implementation?
> (I already free the pbuf that my recv function returns as callback after 
> the read)
>
> Anyone have a suggestion of what could be the problem?
>
> Informations: I'm using an ARM microcontroller with 64kB SRAM and 256kB 
> flash. I already made an HTTP server into it, but it spends very little 
> memory. My external serial (SPI) flash memory have 128MB.
>
> Thanks to all!
>
> Pedro Paulo.
>
>
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--
Stojan Kovacevic, M.Sc.
Engineer / UACB
Tel +381-(0)21-4801-127
Fax +381-(0)21-450-721
address@hidden

RT-RK Group
Fruskogorska 11
21000 Novi Sad
Serbia
www.rt-rk.com



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__________ Informação do ESET NOD32 Antivirus, versão da vacina 4628 
(20091122) __________

A mensagem foi verificada pelo  ESET NOD32 Antivirus.

http://www.eset.com




__________ Informação do ESET NOD32 Antivirus, versão da vacina 4628 (20091122) 
__________

A mensagem foi verificada pelo  ESET NOD32 Antivirus.

http://www.eset.com