"When MEMP_MEM_MALLOC is disabled, use LWIP_IGMP requires LWIP_MULTICAST_TX_OPTIONS enabled and also MEMP_NUM_IGMP_GROUP>1."In addition, you need to have the followingMDNS_MAX_SERVICES 1MDNS_RESP_USENETIF_EXTCALLBACK 1LWIP_NETIF_STATUS_CALLBACK 1LWIP...

I have made a PTP implementation for STM32H7 based on the code from mpthompson. You can find it here: https://github.com/hasseb/stm32h7_atsame70_ptpd