Alertmobile : Avoid having alertmobile go into standby mode on samsung devices

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In Settings, go to Battery and Background usage limits. Click on "Apps never put on auto standby" and add AlertMobile.

 Now, AlertMobile should always run, even if the phone is locked and after 2 minutes. You can verify it on the navigation button  « Overview » of the phone, click on « X active in the background », if AlertMobile is displayed, you should always receive the notification.