# ___ ___ _____ ___
#| _ \ _ \_   _/ __|
#|  _/   / | || (_ |
#|_| |_|_\ |_| \___|
#    NETWORK MONITOR
#-------------------
# Description: This sensor will read water pump informations and error out if it has been running too often in the given interval 
# Parameters:
# -TargetHost:      The host address of the target appliance. Using %host within PRTG will work. 
# -Port             The used SNMP port, defaulting to 161
# -Community        The SNMP community
# -Oids             The OID
# -SensorID         The ID of the sensor 
# -Minutes          The Interval the sensor should look for pump state entries
# 
# Requirements
# ------------------
# - needs snmpget.exe within the EXEXML directory (can be obtained via https://www.snmpsoft.com/cmd-tools/snmp-get/)
# 
# Version History
# ------------------
# Version  Date        Notes
# 1.0      09/02/2017  Initial Release
#
# ------------------
# (c) 2017 Stephan Linke | Paessler AG
param(
    [string]$TargetHost = "", 
    [int]$SensorID,
    [int]$Port = 161,
    [int]$Minutes = 30,
    [string]$Community = "public",
    [string[]]$Oids = @("1.3.6.1.5")
)

$Result = @"
<?xml version="1.0" encoding="UTF-8" ?>
<prtg>
<result>
<channel>Current State</channel>
<value>{0}</value>
<NotifyChanged></NotifyChanged>
</result>
<result>
<channel>Runs in the past {1} minutes</channel>
<value>{2}</value>
</result>
<text>{3}</text>
</prtg>
"@

$EventFilter = @{
		    ProviderName="PRTG Network Monitor Sensors";
		    LogName="PRTG Sensor Logs";
		    ID=1;
		    StartTime=(get-date).AddMinutes(-$Minutes)
	    }

function getOid([string]$Oid){

    $pinfo = New-Object System.Diagnostics.ProcessStartInfo
    $pinfo.FileName = "C:\Program Files (x86)\PRTG Network Monitor\Custom Sensors\EXEXML\snmpget.exe"
    $pinfo.RedirectStandardError = $true
    $pinfo.RedirectStandardOutput = $true
    $pinfo.UseShellExecute = $false
    $pinfo.Arguments = [string]::Format("-r:{0} -p:{1} -t:10 -c:{2} -o:{3} -q", $TargetHost, $Port,$Community, $Oid); 
    $p = New-Object System.Diagnostics.Process
    $p.StartInfo = $pinfo
    $p.Start() | Out-Null

    #Do Other Stuff Here....
    $p.WaitForExit()

    return $p.StandardOutput.ReadToEnd();

} 

$state = [convert]::ToInt32((getOid -oid $Oids[0]).Trim(), 10);

# create an event log entry
Write-EventLog -LogName 'PRTG Sensor Logs' -Source "PRTG Network Monitor Sensors" -Message "Water pump is in state $($state)" -ID $state -EntryType Information

# get the amount of entries in the last x minutes
$Events = (Get-WinEvent -FilterHashtable $EventFilter)

if($State -eq 1)
{ $Message = [string]::Format("The water pump is currently running ({0} runs in the last $($Minutes) minutes)",$Events.Count) }
else
{ $Message = [string]::Format("The water pump is currently not running ({0} runs in the last $($Minutes) minutes)",$Events.Count) }

Write-Host ([string]::Format($result, $State, $Minutes, $Events.Count, $message));