Powershell Notification Parameters

I'm trying to use a powershell Script in a Notification, but I can't get it to work correctly with parameters, that are Placeholders.

The Script I'm trying to run just writes a file containing the parameters and some other info.

I tried with standard parameters: "%sitename %device %name %status %down %message" -> I get no file at all, but as soon as I remove the %sitename, I get a file, but the other parameters aren't resolved, just passed as string %device, %name etc. (In the Notification Test) - which is normal I suppose, since there is no device that sent the event.

When I test this with a real device though ( I set the new Notification on a Ping sensor and then killed the Network Connection) I get no file again.

This is the Script:

param(
    [string]$SiteName = "N/A",
    [string]$Device = "N/A",
    [string]$Name = "N/A",
    [string]$Status = "N/A", 
    [string]$Down = "N/A",
    [string]$Message = "N/A"
    )


$numbers = @(0000)
$outpath = "\\server\sms\outgoing\"
foreach ($number in $numbers){
    $date = Get-Date
    $outfile = $outpath + $date.ToString("hhmmssfff")
    $outstr = "To: $number" + [System.Environment]::NewLine + [System.Environment]::NewLine

    $outstr= $outstr +"$SiteName $Device $Name $Status $Down $Message"
    $outstr | Out-File -FilePath $outfile -Encoding ascii
}

exit 0

   '%hostname' '%linuxuser' 'linuxpassword'

   "%hostname" "%linuxuser" "%linuxpassword"

param(
    [string]$hostName= "N/A",
    [string]$lxuser= "N/A",
    [string]$lxpasswd= "N/A",
    )
$creds = New-Object System.Management.Automation.PSCredential($lxuser,$lxpasswd)

New-SSHSession -ComputerName $hostName -Credentials $creds -AcceptKey $TRUE
Invoke-SSHCommand -Index 0 -Command "service apache2 start"
Remove-SSHSession -Index 0