text: //  Estimote Fleet Management SDK
  //  Copyright © 2016 Estimote. All rights reserved.
  
  /**
   *  Monitoring proximity represents mental model of a beacon's range.
   */
  typedef NS_ENUM (NSUInteger, ESTMonitoringProximity) {
      /**
       *  Unknown proximity. Placeholder for a nil value.
       */
      ESTMonitoringProximityUnknown,
      /**
       *  Phone hears a beacon in near distance (≤ 1.5m).
       */
      ESTMonitoringProximityNear,
      /**
       *  Phone hears a beacon in medium distance (≤ 7m).
       */
      ESTMonitoringProximityMedium,
      /**
       *  Phone hears a far beacon (≤ 15m).
       */
      ESTMonitoringProximityFar
  };
  