Reward a user if his internet was on

Hello All!

I want to reward a user if he clicks and watches an ad or if an ad was not available from the Unity for any reason but not if his internet was switched off. Please guide how I can do this.

Also Please inform of the difference between onunityadsdidfinish notavailable and nofill. as I could not understand these.

Here is the same question answered: Detect if device is connected to Wifi - Questions & Answers - Unity Discussions