Send UDP datagram from Powershell

Send-Datagram

function Send-Datagram {
    [CmdletBinding()]
    param(
      [parameter(Mandatory=$true)][string] $data,
      [parameter(Mandatory=$false)][string] $address="127.0.0.1",  
      [parameter(Mandatory=$false)][int] $port=8125
    )

    $ipAddress = $null
    $parseResult = [System.Net.IPAddress]::TryParse($address, [ref] $ipAddress)

    if ( $parseResult -eq $false ) 
    {
        $addresses = [System.Net.Dns]::GetHostAddresses($address)
        
        if ( $addresses -eq $null ) 
        {
            throw "Unable to resolve address: $address"
        }

        $ipAddress = $addresses[0]
    }    

    $endpoint = New-Object System.Net.IPEndPoint($ipAddress, $port)
    $udpClient = New-Object System.Net.Sockets.UdpClient

    $encodedData=[System.Text.Encoding]::ASCII.GetBytes($data)
    $bytesSent=$udpClient.Send($encodedData,$encodedData.length,$endpoint)

    $udpClient.Close()
}

you forget to connect to the server before you send the payload.

26.  `$udpClient.Connect($address,$port)`