<#
.SYNTAX       send-udp.ps1 [<target-IP>] [<target-port>] [<message>]
.DESCRIPTION  sends a UDP datagram message to the given IP address and port
.LINK         https://github.com/fleschutz/PowerShell
.NOTES        Author: Markus Fleschutz / License: CC0
#>

param($TargetIP = "", [int]$TargetPort = 0, $Message = "")
if ($TargetIP -eq "" ) { $TargetIP = read-host "Enter target IP address" }
if ($TargetPort -eq 0 ) { $TargetPort = read-host "Enter target port" }
if ($Message -eq "" ) { $Message = read-host "Enter message to send" }

try {
	$IP = [System.Net.Dns]::GetHostAddresses($TargetIP) 
	$Address = [System.Net.IPAddress]::Parse($IP) 
	$EndPoints = New-Object System.Net.IPEndPoint($Address, $TargetPort) 
	$Socket = New-Object System.Net.Sockets.UDPClient 
	$EncodedText = [Text.Encoding]::ASCII.GetBytes($Message) 
	$SendMessage = $Socket.Send($EncodedText, $EncodedText.Length, $EndPoints) 
	$Socket.Close() 
	write-host -foregroundColor green "Done."
	exit 0
} catch {
	write-error "ERROR: line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"
	exit 1
}