RE: [lwip-users] LWIP configuration large packet size

[Damon, Antoine]

Hi

 

I relance this subject. Please have you got an idea.

 

Best regards

 

Antoine Damon

 

 

 

De : address@hidden [mailto:address@hidden De la part de Damon, Antoine
Envoyé : jeudi 6 mai 2010 09:54
À : Mailing list for lwIP users
Objet : [lwip-users] LWIP configuration large packet size

 

Hi

 

 

I use LWiP for my project. I run the stack on an embedded board (with blackfin BF527 processor). I use the webserver too. I have created a webpage which is located on my webserver. I would like to use this webpage to show some dynamic data. I couldn’t send some big packets. After two segments, the stack send an acknowledge of the end of transmission.  On my webpage, I get the data with the command xmlhttprequest.

I copy hear the main lines I could see with the sniffer Wireshark

192.168.1.1         192.168.1.11                      HTTP                     GET /polyline_c.xml HTPP/1.1

192.168.1.11      192.168.1.1                        TCP                        TCP segment of reassembled PDU

192.168.1.11      192.168.1.1                        TCP                        TCP segment of reassembled PDU

192.168.1.1         192.168.1.11                      TCP                        vaultbase > http [ACK] seq=444 Ack=1111 win =64425 len=0

192.168.1.11      192.168.1.1                        TCP                        http> vaultbase [FIN,ACK] Seq=1111 ack=444 Win=8192 Len=0

….

 

I configured the TCP IP stack to accept the large packet size (file lwipopts.h), but this change nothing. After the transmission of two segments, the transmission is closed.

 

I attached the file of trace and the file of the Stack configuration.

Thanks for your help.

 

Best regards.       

 

 

 

Antoine Damon

DSP Software Designer

Tel: +33.2.4360.0044

Fax: +33.2.4360.2870

FAURE HERMAN

 

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