Trigger on string change

[mvrasmussen]

Hello

I need some advice on creating functional triggers based on what string is present as value

I have an specifik SNMP item on one of our printers, on normal curcumstances it says:

 "Ready           "

If there is no paper left (or the paper tray is opened it changes to

"Load Paper"

So it resembles whats in the display

What i'm trying to do is triggering when the value changes to "Load Paper" -so an action can be issued.

I've tried the directions in http://www.zabbix.com/forum/showthread.php?t=12402 but it doesent accept it

Any clues?

Thanks
Mads
Denmark

[Davidus]

Probably might work for you,

{HOSTNAME:itemname.strlen(0)}=10
Word "Load Paper" contains 10 characters. Therefore, this trigger will fire up if string length equals to 10
Choose “Character” for your item type

good luck

[mvrasmussen]

{HOSTNAME:itemname.strlen(0)}=10

Thank you for your reply, unfortionally it only returns:

Not allowed value detected in element: Check expression part starting from ' strlen(0)}=10 '

When i tried to add the trigger

My trigger looks like this:

{HP LaserJet P2055dn:display.strlen(0)}=10

Do i understand it right, there is'nt a way to trigger with a string?

[Davidus]

{HP LaserJet P2055dn:display.strlen(0)}=10

This condition is right

What is your item type? Is it zabbix trapper, agent or..?
What is your Type of information? Is it Character, Log…?

[Davidus]

try also,

{HP LaserJet P2055dn:display.strlen(15)}#15

Usually string is 15character long and trigger will fire up if this string will be less or grater than 15

this one might not be right, but take a shot...

[mvrasmussen]

It's SNMP

See attachment

[mvrasmussen]

try also,

{HP LaserJet P2055dn:display.strlen(15)}#15

Usually string is 15character long and trigger will fire up if this string will be less or grater than 15

this one might not be right, but take a shot...

Same error ;/

[Davidus]

The only issue could be with data type
Honestly, have never worked with SNMP yet…

My item looks like this:
Type: zabbix trapper
Type of information: character

My zabbix trapper sends 0 to item if everything is ok, else my strings length is more than 1 (example: “cant ping server”) and my trigger expression looks like this {HOSTNAME:itemname.strlen(0)}#1
It works for me

[Davidus]

ok, why do you have "display" for your item name? "display" is your item description

[mvrasmussen]

I cant get the data anywhere else than snmp

the item is called display because it resembles whats written in the display on the printer

[Davidus]

No, I mean that you should have SNMP OID in your trigger expression instead of item description

{HP LaserJet P2055dn:display.strlen(0)}=10

In this case there is no link to your snmp item

[mvrasmussen]

I really don't understand that.. the data comes back on the item just fine, i have a similar trigger working on the printer where i'm using another item with a diffent OID and that works fine (but thats a numeric value)

[Davidus]

Can you show me the other trigger which is working good?

[mvrasmussen]

The other item i have is attached

The trigger used:

{HP LaserJet P2055dn:paper.last(0)}=0

This is working fine

(The problem with it is that it goes to 0 with all errors, not just paper)

[Davidus]

In this case I`m out of options, sorry