Currently seems only LWIP_NSC_IPV4_ADDRESS_CHANGED check if the
setting is actually being changed.
When enable LWIP_NETIF_EXT_STATUS_CALLBACK:
I got below event everytime when dhcp server re-assigned ip address even the
gateway/netmask/ip are exactly the same with previous setting.
LWIP_NSC_IPV4_GATEWAY_CHANGED
LWIP_NSC_IPV4_NETMASK_CHANGED
LWIP_NSC_IPV4_SETTINGS_CHANGED
I'm wondering if these callbacks should be called only when the
setting is actually being changed.
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