Radperf Template example

So after a long time, radperf is back and available for download. I've got it downloaded and it's working well, although there is no readme for the product. And since i never used the old version, I don't have the requisite knowledge to do what I need. I need to implement the -T feature (template) for radius requests in order to add the NAS-ID or NAS-IP-Address fields. I'm assuming there is a specific format for adding these fields to the Radius-Request, but no clue what it needs to be. Any help would be appreciated. Thanks Jake