Invert a value in SNMP monitor

[shshs]

Greetings,

I have a pfSense with bunch of IPSec VPN tunnels setup. To monitor the tunnel status (which is provided by strongswan daemon that is tunning in pfSense) I had to install additional scripts:

https://github.com/alanwds/zabbix_ipsec_pfsense/

In general everything works fine, but status of the IPSec tunnel itself is returned in inverse value on the graph: when it's "UP" zabbix draws it in "0" and when the tunnels is "DOWN" it draws it in "1". Here is an example when the actual tunnel status is "DOWN":


on the graph below the tunnel is "UP":


I know that you are not responsible for 3rd party integration tools/scripts, but may be you can advice me the easiest way to invert tunnel "status" graph values. Is it in .xml template file?
Thank you.

[Hamardaban]

You can change the script check_ipsec.sh so that it returns inverse values.After that, change the trigger prototype in LLD so that it responds to the value <1.