LWIP will drop the oldest package at the arp packet cache queue and return "ERR_OK" We change it that ARP level will drop the current packet and return "ERR_MEM" to tell user that you should send the packet again latter.
LWIP will drop the oldest package at the arp packet cache queue and return "ERR_OK" We change it that ARP level will drop the current packet and return "ERR_MEM" to tell user that you should send the packet again latter.