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TCPnet ultralow bandwith with high ping connections

Hi,

I'm currently using TCPnet on Ethernet in my app and I get decent speed in my LAN (650 Ko/s FTP reading on a SD card).
We deployed recently the project with a intercontinental
connection so we get high ping (about 300ms).

And now the speed is catastrophic !! (3-4 kB/s).
After some (little) research I found why :
TCPnet has to wait an ACK from the remote IP after every packet sending. So even with full packets of 1500 bytes
, and with a 300ms of ping,TCPnet can send only 3 frames every second ....

Could it be possible to implement a TCPnet side sliding-window management in order to be able to send more than only one frame before getting an ACK ?