Nucleo-F439ZI FreeRTOS + TCP always returns a byte count of 0xfffffff4

[ActoryOu]

@sensor_guru

I’m able to ping the Nucleo fine from the PC, verified through Wireshark (can’t upload pcap as I’m a new user), getting a successful [SYN}, [SYN, ACK] and [ACK]. When I go to send a message of 0xDE AD BE EF to the Nucleo Wireshark shows it keeps trying a [TCP Retransmission].

Hi @sensor_guru,
The value 0xfffffff4 represents -pdFREERTOS_ERRNO_ENOMEM , which prvRECVWait returns when unable to allocate memory for the TCP stream buffer. For helpful advice on this issue, please see: FreeRTOS TCP/IP pdFREERTOS_ERRNO_ENOMEM (Nucleo-F767Zi).

Thank you.