returns a byte bitfield with a given bit set . concode_field_sep byte NUL concode_elem_sep byte RST concode_elem_sep UByte SYN_HEADER_LENGTH concode_elem_sep byte SYN concode_elem_sep int CHECKSUM_INDEX concode_elem_sep byte EACK concode_elem_sep byte ACK concode_elem_sep UByte NUL_HEADER_LENGTH concode_elem_sep UByte ACK_HEADER_LENGTH concode_elem_sep UByte EACK_HEADER_LENGTH concode_elem_sep UByte RST_HEADER_LENGTH concode_field_sep placeholderType placeHolder