LWIP server recovery after cable unplug/replug

There should be a function called something like "Ethernet_Link_Periodic_Handle", where the PHY link status is checked on a regular basis.

There you can re-initialize the netif and lwip stuff if link is down.

I think the Cube version doesn't work, that is something I yet have to take care of, so I can't help you anymore.

But there should be a thread somewhere, maybe start here:

https://community.st.com/s/question/0D50X0000BOtfhnSQB/how-to-make-ethernet-and-lwip-working-on-stm32

Rather than relying on Cube generated stuff, check more recent ETH examples here: https://github.com/stm32-hotspot/STM32H7-LwIP-Examples

Please check the version of HAL Library.

​

If you use v1.10.0, it included bug in link callback function.

​(it is possible to improve using updated HAL Library as v1.11.0)

You should ​enable for Link Callback in LwIP Key Options.

Check the code of the ethernet_link_thread() function in the ethernetif.c file

  if(linkchanged)

  {

   /* Get MAC Config MAC */

   HAL_ETH_GetMACConfig(&heth, &MACConf);

   MACConf.DuplexMode = duplex;

   MACConf.Speed = speed;

   HAL_ETH_SetMACConfig(&heth, &MACConf);

   HAL_ETH_Start_IT(&heth);

   netif_set_up(netif);

   netif_set_link_up(netif);

  }

You need to change the initialization function to _IT() as shown below.

HAL_ETH_Start(&heth); -> HAL_ETH_Start_IT(&heth);

Best regards.