FreeRTOS unexpected CRC error

Libraries
1

Hello all,

I am running a server and a client on two microcontrollers that have their TCP/IP stack setup in the exact same way. Sometimes it works, but more often than not I cannot get reliable communication between the two. The hardware is fine, and my links are short with a switch that has nothing else connected to it.

I keep getting this error on the server side after a connectionis established, but I don’t get the same error on the client side.

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When I reduce the buffer size to 520 bytes, I get the following on the server side, but not on the client

eSYN_RECEIVED: ACK expected, not SYN: peer missed our SYN+ACK

Any ideas where I could start debugging to see where the issue is?

Thanks in advance

2

@MateoSegura,
The logging shows that incoming packets have an incorrect checksum.
Doesn’t your hardware calculate the checksums? And if so, maybe it changes the value of the CRC-fields?

Another thing I think of is data corruption. Can you tell what platform you are using, and can you show the contents of your FreeRTOSIPConfig.h?

When I reduce the buffer size to 520 bytes

What “buffer size” do you mean?