I used the following steps to successfully debug over wifi connection. I recommend this solution to everybody experiencing problems using integrated solutions like Android WiFi ADB plugin. In my case it failed to keep the Wifi connection to my device after unplugging USB. The following solution overcomes this problem.
Nokia C5-00.2 Wifi Software 28
After that adb devices -lshows a single wifi connected device. This devices shows also up in android studio and can then be selected for debugging. When the connection is unstable you may need to repeat the above command from time to time to reactivate the connection.
Android wifi ADB was earlier working on my IDE but after Updating Android Studio (my current is Android Studio 3.3) it is not working and always prompt as "Unable to connect to device......Same network"
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