TLV_HDR_LEN
uint16_t len = TLV_HDR_LEN;
tlvlen = TLV_HDR_LEN;
if (len < TLV_HDR_LEN) {
buf += TLV_HDR_LEN;
len -= TLV_HDR_LEN;
offset = TLV_HDR_LEN;
uint16_t len = TLV_HDR_LEN;