Will I receive Communicate notifications if app is in background?

Yes, if the app user has opted into both Location Services and Notifications for you application, Communicate notifications will be delivered in any app state (foreground/background/swipe-closed).  For use with BLE beacons, bluetooth must be turned on for the mobile device

1. The beacon is configured to work in the background. For instance, a Series 21 beacon in its default configuration
2. The beacon is in a place and you’re triggering based on the arrival to that place
3. The place does not have RSSI place attributes set (which can effectively limit the range of that beacon/size of that place), or if you do, you realize that an arrival won’t immediately +trigger when the SDK sees the beacon but only after it sees it strongly enough (greater than the RSSI threshold set for the place)
4. The app has been launched at least once previously
5. The communicate is set properly to trigger on arrival