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[lwip-users] Problem sending huge bytes of data

From: Sanchayan
Subject: [lwip-users] Problem sending huge bytes of data
Date: Sat, 5 Nov 2011 11:26:31 +0530

Hello everyone,
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.
To find this out, i captured the data sent over TCP IP by the application running on PC, through wireshark, so i know what bytes are being sent exactly by the application i am running. To check whether this is received correctly, i send the data which was captured by my controller board back over a serial connection.
The wireshark capture file showing the data sent by my PC having IP is included in the attached debug.pcap wireshark capture file.
The data which my controller board having IP receives can be seen in the attached debug.txt file.
A comparison of the two shows, that in Frame 14 with a payload of 388 bytes, only the first 200 bytes are received correctly. And i have tried this quiet a few times, the same thing happens everytime.
Can someone help me out, as to why this may be happening. What i can think of is either the buffer gets cleared somewhere in the middle or this is a problem with buffer size. This problem does not occur for low payload sizes of a few 20 to 30 bytes.
Any help or pointers would be appreciated. Thanks.
Thanks & Best Regards,
Sanchayan Maity.

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Attachment: debug.txt
Description: Text document

Attachment: debug.pcap
Description: Binary data

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