No UDP packets transmitted after ARP reply

[Armageddon]

Hello,

I'm using the STM32F767ZITx MCU and the lwIP library to transmit and receive UDP packets every 1 ms.

Everything works fine but sometimes, after the ARP table has expired, UDP packets are no longer transmitted for several seconds even though my STM has received a response to its ARP request (as seen with Wireshark).

What solutions are there to avoid this scenario? Is this normal lwIP behavior?

Thanks for your help.

[Armageddon · Accepted solution]

I was able to solve the problem.
Although I don't have a powerful enough tool to see the problem, I think that the ETH_REF_CLOCK signal (RMI only) used as a reference clock at 50MHz was not clean enough.

The clock was indeed at 50MHz but with another signal on it probably, because after a little filtering my problems disappeared.

Sorry to have involved you, thank you for your time.