Q:

Getting notification when device enters/ leaves WiFi

I would know about possibilities to get notified (push notification on my mobile or an email) whenever a certain device connects to/ disconnects from my WiFi.
I´m using a fritzbox.
Any ideas?
Many thanks,
Christian

A:

You can try the fritz!box "Push Services" set up your email and the trigger for every new event.
You could set up a Windows or Linux machine with periodic network scans. 

For example a RaspberryPI with Nmap. Schedule a script with crontab to run every minute 1. This script should scan your network with Nmap and post the output of that scan to Ndiff. Ndiff is a Nmap utility which compares two Nmap scans and checks for differences 2. If there is a difference your script will then send you an email with the latest scan.

