[lwip-users] TCP message merging fault

[Çağlar AKYÜZ]

Hi,

First of all forgive me if I'm asking something so fundamental but I 
can't find any remedy to my problem. Besides, I have no idea what's 
going on.

I'm running lwIP on my custom Arm7 board successfully for a while. Until 
now I used UDP(it's working quite well), but I want to implement TCP 
functionlity as well. I write my TCP code
(actually I'm using one of the examples presented in this list before) 
using raw api. I can successfully send large packets ( ~ 1k) but small 
packets(~ 30 bytes) are merged into one packet.
For example, When I send "Read" and "Write" messages, they're delivered 
as "ReadWrite".

I'm not sure that this is fault of  lwIP stack! Because I see the same 
behaviour when I send messages from my linux box also. I don't know what 
kind of an error I'm making can cause this
kind of strange behaviour.

Should I play with my lwIP options or should I review my linux network 
programming knowledge? Moreover, can I investigate this problem using 
Ethereal?

Thanks for your valuable comments.
Çağlar AKYÜZ