t_key
bwfm_key_set_cb(sc, &t->t_key);
bwfm_key_delete_cb(sc, &t->t_key);
t->t_key.key = wk;
memcpy(t->t_key.mac, mac, sizeof(t->t_key.mac));
t->t_key.key = wk;
memset(t->t_key.mac, 0, sizeof(t->t_key.mac));