Forgot one: DownyTif wrote:
Is TCP_WND only for receiving data? If I only receive small frames in my lwip, do I have to still make it big?
TCP_WND is the receive window announced to the other side with a SYN, but it is also used as a maximum limitation on a transmit window received from the other side. This is to limit memory allocation in the lwIP application. So you still have to set it high when only receiving a little data but sending much.
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