How do I read the JN51xx MAC address?

The MAC address location can be found by calling pvAppApiGetMacAddrLocation() The prototype can be found in AppApi.h

For example:

PUBLIC void MAC_vReadExtAddress(MAC_ExtAddr_s *psExtAddress)
{
    uint32 *pu32Mac = pvAppApiGetMacAddrLocation();
    psExtAddress->u32H = pu32Mac[0];
    psExtAddress->u32L = pu32Mac[1];   
}