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TCPnet - TCP window management

Hi,

I'm using a homemade FTP server library , and recently , I observed a strange behaviour using it with Firefox as ftp client.

When I want to download a file from my server with firefox , the browser uses a 64K buffer window for the data connection .
The server sends data as fast as it can from the SD card (~550KB/s) , but quickly, the window is decreasing to zero , and the server still try to send data.

TCPnet does not seems to manage the buffer window of the host ....

Does someone has a solution to this problem ?

thanks in advance.