Just a simple script to test ESXi Connectivity and return the current license state of the server by using PowerCLI

Simple Script
param(
    [Parameter(Mandatory = $true, HelpMessage = 'Provide username for login on ESXi')]
    [String] $username,
    [Parameter(Mandatory = $true, HelpMessage = 'Provide password for login on ESXi', ParameterSetName = 'Secret')]
    [Security.SecureString] $password

)

#check user/pwd
if($username -like "" -Or $password -like "")
{
    Write-Host -ForegroundColor Red "Username/Password seems wrong"
    exit(1)
}

#define domain
$domain="forensik.justiz.gv.at"

#disable certificate checking as we have self signed certs
Set-PowerCLIConfiguration -InvalidCertificateAction Ignore -Confirm:$false

$hosts="SITE01-ESX01","SITE01-ESX02","SITE01-ESX03","SITE01-ESX04","SITE01-ESX05","SITE01-ESX06","SITE02-ESX01","SITE02-ESX02","SITE02-ESX03","SITE02-ESX04","SITE02-ESX05","SITE02-ESX06" 



foreach($var_host in $hosts)
{
    Write-Host -ForegroundColor Yellow $var_host"."$domain
    Connect-VIServer -Server $var_host"."$domain -User $username -Password ([Runtime.InteropServices.Marshal]::PtrToStringAuto([Runtime.InteropServices.Marshal]::SecureStringToBSTR($password)))
    $(Get-VMHost).Name
    $(Get-VMHost).Version
    $(Get-VMHost).LicenseKey
    $(Get-VMHost).Uid
    Disconnect-VIServer $var_host"."$domain -WarningAction SilentlyContinue -Confirm:$false
    Write-Host -ForegroundColor Cyan "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
}