[lwip-users] transfer stucks when snd_wnd is less than TCP_MSS

[Vlad]

Hi all!

I've following problem: tcp_output stops to send packets when pcb->snd_wnd is 
setup to value < TCP_MSS (i've sending "big" packets, sized by 
tcp_sndbuf(pcb)).

My program sends near 100kb and connection freezes (tcp_output drops packets 
because they are larger than current pcb->snd_wnd). Remote server sets it to 
small values (820 bytes and less) when i making stress-test (for example 
uploading few files on same network connection).

I can receive big amounts of data without problems in same code. Problem only 
in transferring.

How can i solve this problem ?

Thanks