Send-UdpDatagram.ps1

function Send-UdpDatagram
{
      Param ([string] $EndPoint,
      [int] $Port,
      [string] $Message)

      $IP = [System.Net.Dns]::GetHostAddresses($EndPoint)
      $Address = [System.Net.IPAddress]::Parse($IP)
      $EndPoints = New-Object System.Net.IPEndPoint($Address, $Port)
      $Socket = New-Object System.Net.Sockets.UDPClient
      $EncodedText = [Text.Encoding]::ASCII.GetBytes($Message)
      $SendMessage = $Socket.Send($EncodedText, $EncodedText.Length, $EndPoints)
      $Socket.Close()
}

# function becomes available after loading into your ISE environment
# Send-UdpDatagram -EndPoint "<REMOTE_GW_IP>" -Port 500 -Message "test.mymetric:0|c"
# Send-UdpDatagram -EndPoint "<REMOTE_GW_IP>" -Port 4500 -Message "test.myothermetric:0|c"