ping-RDP.ps1

<# This gist is TRIMMED to just the core pieces #>

#*------v Function Test-Port() v------
function Test-Port {
    # attempt to open a port (telnet xxx.yyy.zzz nnn)
    # call: Test-Port $server $port
    PARAM([parameter(Mandatory=$true)] [alias("s")] [string]$Server, [parameter(Mandatory=$true)][alias("p")]
    [int]$port
    ) ; 
    $ErrorActionPreference = “SilentlyContinue” ; 
    $socket = new-object Net.Sockets.TcpClient ; 
    $socket.Connect($Server, $port) ; 
    if ($socket.Connected) {
        write-verbose -verbose:$true  "Successful connection to $($Server):$($port)"
        $socket.Close()
        return $True;
    } else {
        write-verbose -verbose:$true  "Failed to connect to $($Server):$($port)"
         return $False;
    } # if-block end
    $socket = $null
}#*------^ END Function Test-Port() ^------

#*======v SUB MAIN v======
$tsrvr=read-host -prompt "Server to be pinged until RDP available" ;
Do {write-host "." -NoNewLine;Start-Sleep -m (1000 * 5)} Until ((test-port $tsrvr 3389)) ;
 write-host "`a" ; # beep
 write-verbose -verbose:$true  "$((get-date).ToString('HH:mm:ss')):Launching rdp to $($tsrvr)..." ;
mstsc.exe /v:$($tsrvr) ;
#*======^ END SUB MAIN ^======