1. Go to iPhone’s settings > Notifications and check if notifications is turned on for GDB monitor app.
2. Launch GDB monitor app, Go to the ‘About’ tab and logout. Then login again.
3. Make sure “DON’T DISTURB” is not on. If you are not familiar with this setting, see this link https://support.apple.com/en-us/HT204321. Also check the focus settings (https://support.apple.com/guide/iphone/set-up-a-focus-iphd6288a67f/ios).
4. Check the GDB monitor app notification frequency settings by tapping the device in the monitor app and then tapping ‘Notification Frequency’. Have you disabled the initial notification? If yes, you will only get notifications when the garage is left open for certain time.
5. Try rebooting the phone.
6. If you are using iOS8, upgrade to iOS 9 to try again. There are some issues for notifications on iOS 8.
7. Did you change the setting in the monitor app to only notify you when the garage door is left open for some amount of time? If yes, you won’t get the initial notifications when the garage door opens or closes.
8. Logout. Click the “About” tab in the monitor app, then click “Logout”. Delete the monitor app from your phone. Install the monitor app again from app store. Login. Check if you get notifications when open/close the garage door.