code: @TargetApi(Build.VERSION_CODES.FROYO)
      public String getBase64EncodedTelemetry(Beacon beacon) {
          byte[] bytes = getTelemetryBytes(beacon);
          if (bytes != null) {
              String base64EncodedTelemetry = Base64.encodeToString(bytes, Base64.DEFAULT);
              // 12-21 00:17:18.844 20180-20180/? D/EddystoneTLMAccessor: Rehydrated telemetry bytes are :20 00 00 00 88 29 18 4d 00 00 18 4d 00 00
              // 12-21 00:17:18.844 20180-20180/? D/EddystoneTLMAccessor: Base64 telemetry bytes are :IAAAAIgpGE0AABhNAAA=
              Log.d(TAG, "Base64 telemetry bytes are :"+base64EncodedTelemetry);
              return base64EncodedTelemetry;
          }
          else {
              return null;
          }
      }
docs: Extracts the raw Eddystone telemetry bytes from the extra data fields of an associated beacon
  and base64 encodes them.  This is useful for passing the telemetry to Google's backend
  services.
  @param beacon
  @return base64 encoded telemetry bytes