Solution:

The wl-acl-mac command : What does it do? Set access control policy MAC address for Access Point mode. The argument is the MAC address that will be used in conjunction with the wl-acl-policy field to perform basic MAC level access control. The format of this string should be xx:xx:xx:xx:xx:xx, where the xx's are hexadecimal byte values composing a valid MAC address. If desired, the wildcard ('*') character can be used as one or more of the xx's. For example, to allow only clients with a MAC address starting with 00:0B:28 to associate, the wl-acl-policy should be 'allow', and this MAC address should be '00:0B:28:*:*:*'. The AIrborne code only supports one address (address range with *) in the wl-acl-policy