Send WOL Packet

Send-WakeOnLan.ps1

function Send-WakeOnLan
{
    [CmdletBinding()]
    param(
        [Parameter(Mandatory=$True, Position=1, ValueFromPipeline=$True, ValueFromPipelineByPropertyName=$True)]
        [Alias("Name")]
        [string[]] $ComputerName
    )

    Begin
    {
        Write-Verbose "Initialize UDP Client."
        $Udp = New-Object System.Net.Sockets.UdpClient
    }
    Process
    {
        ForEach ($Computer in $ComputerName)
        {
            $MacAddresses = (Get-WmiObject -Class SMS_R_SYSTEM -Namespace "Root\SMS\Site_100" -ComputerName "<AD Controller>" -Filter "Name='$Computer'").MACAddresses

            ForEach ($MacAddress in $MacAddresses)
            {
                Write-Verbose ("Sending Packet to Computer:{0} @ MacAddress: {1}" -f $Computer, $MacAddress)
                
                $MByteArr = $MacAddress -split "[:-]" | % { [Byte] "0x$_" }
                [Byte[]] $MPacket = (,0xFF * 6) + ($MByteArr  * 16)
                
                $Udp.Connect(([System.Net.IPAddress]::Broadcast),7)
                $Udp.Send($MPacket,$MPacket.Length) | out-null
            }
        }
    }
    End
    {
        Write-Verbose "Close UDP Connection."
        $Udp.Close()
    }    

}