Hello Sam,
I successfully used a TFTP server that I downloaded and installed to my workstation. Get it at http://tftpd32.jounin.net.
Here's the pertinent Powershell code:
$URL = "tftp://" + $WorkstationIP_Address + "/" + $Bay1_Certificate_File
Write-Host " Beginning certificate download to" $Target_FQDN -ForegroundColor Cyan
$Result = Start-HPOACertificateDownload -Connection $Target_OA -Type OA -Bay 1 -URL $URL
IF ($Result.StatusType -eq "Error")
{
Write-Host $Result.StatusMessage " Press Enter to continue" -ForegroundColor Red
[console]::Beep(999,2000)
Read-Host
}
ELSE
{
Write-Host $Result.StatusMessage " Process will now sleep for 3 minutes." -ForegroundColor Cyan
Sleep -Seconds 180
}