I needed to implement a networking application with a server in a local network, with no Internet access. Then I found that unity5 networking api providing exactly what i want. So I studied manual, scripting API and made simple & light implementation providing basic features. It will be useful for non-game, which like manage client's realtime status.
In my case, UNET is actually quite strong. I am using this unity multiplayer feature as a kind of test tool for children. About 2~30 mobile devices connect to server(also mobile device), and then test result are displayed on server in realtime.
See my workaround to click the below link.
https://github.com/ifndefdeadmau5/unity5-networking-HLAPI-getting-started