Make SNMP generate OK or System Error

This is more something that perhaps other people can use too. PRTG is very good for monitoring value's from SNMP, I use it a lot for my Cisco's, harddisk usage etc. But now I wanted PRTG to generate an error (red button) when the temperature from one of our environment sensors reached a certain value.

So this is how I did that.

1. Installed Simple SNMP Query Tool (http://www.digigrupp.com/ssnmpq/)

2. Build a Powershell script that take parameters and uses the above program :

param([string]$OID,[string]$COMMUNITY,[string]$SHOST,[int]$TVALUE)

$OID = "/o:$OID"

# For a little debugging from my side, can be removed
write-host $OID $COMMUNITY $SHOST $TVALUE 

# Get SNMP values
cd "C:\Program Files\ssnmpq"
$waarde=./ssnmpq.exe /h:$SHOST /c:$COMMUNITY $OID|Select-String Value

# Remove some spaces and stuff
$waarde = $waarde -replace " ",""
$waarde = $waarde -replace "'",""
[int]$waardeg = [int]$waarde.Substring(6)

if ($waardeg -ge $TVALUE)
 {
  write-host $waardeg":NOK"
  exit 2
 }
else
 {
  write-host $waardeg":OK"
  exit 0
 }

3. Created a custom sensor in PRTG which uses (for example) these parameters:
"1.3.6.1.4.1.9.9.13.1.3.1.3.1005" "public" "192.168.1.1" 40

Mind you, I am no programmer so feel free to shoot on this, perhaps I can learn something from it, too :)

powershell prtg snmp