Have you read the docs ? the wiki ? you can pump into the buffer as much as it fits into the buffer.TCP can send as much as its window allows, and will certainly need ACKs to keep sending thereafter.
http://lwip.wikia.com/wiki/Raw/TCP -- Sergio R. Caprile, Human Being, Bs.As., Argentina http://www.scaprile.ldir.com.ar/
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