Checksum Error LWIP

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The error seems to add a 1 sec delay before it moves on. The delay is to much for my application.

Any idea how to address the issue or shorten the delay after checksum error is found?[/b]

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To be honest you need to look at the cause of the checksum errors, or provide a simple test case to reproduce it. If you really want to change the retransmission frequency, which I think will only move your problem the the function you need to look at is tcp_slowtmr in tcp.c.