enableProximityMessaging

Enables proximity messaging. This will only succeed if:

• setProximityEnabled was set to true
• The AltBeacon dependency was included in your build.
• The device has the correct hardware and API level (18)
• The play-services-location dependency was included in your build
• The ACCESS_FINE_LOCATION permission has been granted.
• The ACCESS_BACKGROUND_LOCATION permission has been granted on Android Q+.
• The device has the supported play services version.