Re: [lwip-users] Problem sending huge bytes of data

[vincent cui]

I always use it as 1024....

Vincent Cui
Sr. Firmware Engineer
Mobile: +8613255150315
Tel: +86 21 34612525x6104
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Shanghai EnLogic Electric Technology Co., Ltd.
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-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Sanchayan
Sent: 2011年11月11日 10:37
To: Mailing list for lwIP users
Subject: Re: [lwip-users] Problem sending huge bytes of data

Thanks Kieran and Stephen for helping out. I changed the value of 
PBUF_POOL_BUFSIZE from 256 to 512. The problem was resolved.

Thanks & Best Regards,
Sanchayan Maity.


----- Original Message ----- 
From: "Stephen Cleary" <address@hidden>
To: "Mailing list for lwIP users" <address@hidden>
Sent: Friday, November 11, 2011 02:05
Subject: Re: [lwip-users] Problem sending huge bytes of data


> Another common problem is a lack of message framing.
>
> Ensure that your application is correctly receiving 300 bytes. I.e., check 
> the return value of lwip_recv.
>
> http://lwip.wikia.com/wiki/Receiving_data_with_LWIP
>
>        -Steve
>
> ________________________________________
> From: address@hidden 
> address@hidden on behalf of 
> Kieran Mansley address@hidden
> Sent: Thursday, November 10, 2011 11:28 AM
> To: Mailing list for lwIP users
> Cc: Hemant
> Subject: Re: [lwip-users] Problem sending huge bytes of data
>
> On Sat, 2011-11-05 at 11:26 +0530, Sanchayan wrote:
>>
>> In my application i am trying to send around 300 plus bytes to my
>> controller board using the lwip stack, over TCP IP. I receive 200
>> bytes correctly, but the rest are garbage.
>
> My best guess is that your packet buffers are configured to be around
> 256 bytes long each, and so the first one contains headers and ~200
> bytes of data.  This gets sent properly, but your driver doesn't handle
> pbuf chains properly (iterating over pbuf->next to find all the data).
> This means everything after the first pbuf is garbage.
>
> Check that out and see if it makes sense.
>
> Kieran
>
>
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