Continuous WiFi polling may drain your battery. Avoid that by popping up a notification.
If
Connects or disconnects from any WiFi network
This Trigger fires every time your Android device connects or disconnects from any WiFi network.
Then
Send a notification from the IFTTT app
This action will send a notification to your devices from the IFTTT app.
ID sZXDhJF8
Explore more great ways to automate Notifications and Android Device