Mirror Networking has a lot of example scenes that show how to use it. I tried running two instances of one of their examples called Pong. Pong Example Folder
It worked pretty well, however when I tried running it on two different devices (my pc and my smartphone) it didn't work. It actually worked for less than a second, but then the app stops suddenly. I tried disabling the firewall on Windows, but nothing changed.
This video below shows exactly the problem I am facing: https://www.youtube.com/watch?v=k3qa4lFM7xo&feature=youtu.be The IP address shown in the video (192.168.15.5) is the IP of my phone, which in that case is the host.