How do I see if the user has disconnected?

[Mark Antony]

> If you keep complaining, you will be banned from the list. I have zero patience for people who don't follow instructions, try to lord it over me, and who complain when told that their behavior is inappropriate.

I wasn't complaining. I was admiring you. You are already an internet celebrity. People blog about you. In case you didn't know about your reputation:

https://networkingpills.wordpress.com/2019/06/20/how-ive-got-banned-from-freeradius-users-mailing-list/