The function codes for this enforcer as string. A function code has the syntax: <val> If more than one value is given for a function code, values are separated by a , sign (comma). Note: The user can define any number between 0-255. The code must be a number (in decimal format). Following function codes are defined by the DNP3 standard IEEE 1815-2012: 0 confirm 1 read 2 write 3 select 4 operate 5 direct_operate 6 direct_operate_nr 7 immed_freeze 8 immed_freeze_nr 9 freeze_clear 10 freeze_clear_nr 11 freeze_at_time 12 freeze_at_time_nr 13 cold_restart 14 warm_restart 15 initialize_data 16 initialize_appl 17 start_appl 18 stop_appl 19 save_config 20 enable_unsolicited 21 disable_unsolicited 22 assign_class 23 delay_measure 24 record_current_time 25 open_file 26 close_file 27 delete_file 28 get_file_info 29 authenticate_file 30 abort_file 31 activate_config 32 authenticate_req 33 authenticate_err 129 response 130 unsolicited_response 131 authenticate_resp