Geofence radius defaulting to 150?

[lloydelvt]

Your Environment

• Plugin version: 4.14.0
• Platform: Android
• OS version: Several
• Device manufacturer / model: Several

• Plugin config:

  bg.Config(
      //locationUpdateInterval: 5,
      //batchSync: true,
      useSignificantChangesOnly: Platform.isAndroid,
      maxRecordsToPersist: 25,
      url: 'https://${GetIt.I.get<EnvironmentsManager>().appDomain}${Endpoints.locationFlutterReport}',
      params: {'profile_id': profileId, 'location_token': securityToken.isSuccess ? securityToken.data : ''},
      autoSync: true,
      //transistorAuthorizationToken: token,
      backgroundPermissionRationale: bg.PermissionRationale(
          title: "Allow MotorMouth to always access this device's location",
          message: 'MotorMouth collects location data to enable recording your trips,'
              ' geofence entries and exits, and to calculate distance-travelled even '
              'when the app is closed or not in use. '
              'Motormouth does not sell location data to any 3rd parties.',
          positiveAction: 'Change to "{backgroundPermissionOptionLabel}"',
          negativeAction: 'Cancel'),
      notification: bg.Notification(title: 'Motor Mouth', text: 'Location Service'),
      desiredAccuracy: bg.Config.DESIRED_ACCURACY_HIGH,
      distanceFilter: 50.0,
  
      /*** stop receiving location updates when the app is terminated ***/
      stopOnTerminate: false,
      startOnBoot: true,
  
      /*** set to true to star location tracking immediately ***/
      isMoving: true,
  
      /*** enable headless mode for android, must be set to true! ***/
      enableHeadless: true,
  
      /*** et to false in release mode ***/
      debug: false,
      logLevel: bg.Config.LOG_LEVEL_VERBOSE));

Expected Behavior

The Geofence should be set to whatever Radius we set.

Actual Behavior

The Radius is being defaulted to 150 if the radius is smaller

Steps to Reproduce

1. Create a geofence with a radius smaller than 150
2. check the Geofence radius using (await bg.BackgroundGeolocation.geofences)

[christocracy]

That’s right, the minimum functional radius is 150 meters, imposed by the OS.

[lloydelvt]

Is this a new imposition by the OS?

[christocracy]

No, the OS have always only responded to a minimum radius of 150 meters. It doesn’t matter if you set it to 0, the OS will respond as if you set it to 150.

you cannot have a geofence on either iOS or Android with a radius < 150.

[lloydelvt]

Ok I see thank you Chris

[lloydelvt]

Chris, the family tracking and safety application Life360 applies a 250ft radius (about 76 meters) to their smallest geofence. Do you know why they are able to do this differently form the OS limitation standpoint?

[christocracy]

Both iOS and Android respond only to a minimum geofence radius is 150 meters. Google it.