TREAD_STR
TREAD_STR(sptr, ap_req.data, ap_req.length);
TREAD_STR(ptr, ptr2, reqcksum.length);
TREAD_STR(ptr, ptr2, option.length);
TREAD_STR(sptr, ap_rep.data, ap_rep.length);
TREAD_STR(sptr, ap_rep.data, ap_rep.length);