[Help Wanted]:

[zpatrickbuck]

Required Reading

• Confirmed

Plugin Version

^5.0.1

Mobile operating-system(s)

• iOS
• Android

Device Manufacturer(s) and Model(s)

various

Device operating-systems(s)

varios

What do you require assistance about?

Hi FBG community,

Perhaps an unconventional post for this github, but I’m looking to hire a developer experienced with FBG.

I'm a PhD student at the University of Connecticut developing a longitudinal research application that employs FBG for location tracking on iOS/Android in background and on-terminate. The system is active now and working well overall in a release build, but I am looking for a developer with experience using FBG to audit my implementation before final release. It’s about 2000 lines of code total.

The system is for iOS and Android, and tracks GPS samples across background and terminated modes, as well as geofence events.

What I have:

• Full-tracking mode with server-side breadcrumb ingestion via Cloud Function
• Geofence ENTER/DWELL/EXIT detection with native HTTP delivery and a Dart-layer state machine
• Android headless task for terminated-state geofence events and Geofencing API re-arming
• iOS: silent push wakeup + BackgroundFetch periodic wakeup for SQLite buffer flushing
• Server-side zone tracking with GPS-computed geofence events as a fallback for missed device detections

I'm looking for an developer experienced with FBG to look over my code. Particularly, this would focus on:

• Review of geofence event reliability in terminated state on both platforms
• Assessment of long-term tracking stability (I’m looking for weeks-months of continuous use without dropoff)
• Battery and Cloud Function cost optimization review
• Help with a few bugs: 1) iOS implementation has been particularly challenging, with unreliable GPS emits once the user terminates the app. 2) Geofence events are also sometimes unreliable, primarily on iOS.

This would likely start with a short discussion for more detail on my use case, at which point the developer would take a few hours to go over the code and return with an issue/fix list. Depending on the result this could continue in further work and discussions. I would be available for additional information during this period.

The developer should budget a maximum of 6-8 hours for the project, including final discussion. Use of AI is encouraged to expedite the process but I have of course also done this myself and so am looking for a developer who has real expertise with FBG too. Depending on the outcome, this could also turn into a longer term consultancy as I deploy the app over the next year or two.

Interested parties can respond here or to my email zachary.buck@uconn.edu with their rate and FBG experience.

Thank you!

[Optional] Plugin Code and/or Config

[Optional] Relevant log output

[christocracy]

Anyone?
@transistorsoft/flutter-background-geolocation

[herman-the-worm]

If it is allowed to post here @christocracy I am providing information below.

We have recently completed similar setup for our customers feel free to contact us via contact form on https://codinghouse.biz

[ozhanaydin]

Hi Zachary,
I came across your post on GitHub and wanted to reach out.
I’m a Flutter developer with production experience using FBG (^5.x) on both iOS and Android. I’ve built and maintain a live tow truck dispatch platform called En Hızlı Çekici (enhizlicekici.com, App Store & Google Play), which uses FBG for real-time driver tracking in background and terminated states, backed by Firebase Cloud Functions and Firestore.
I haven’t implemented geofencing specifically, but I’m deeply familiar with FBG’s configuration, iOS background/terminated state behavior, and Firebase-based location ingestion pipelines — which covers a good portion of what you’re looking to have reviewed.
I’d be happy to start with a short call to understand your setup, then do a focused code review on the areas you outlined.
Best,
Özhan

[radixdt3349]

Hi @ozhanaydin and @herman-the-worm,

I wanted to check if your app is working correctly in the terminated state on iOS. I’ve been trying to get this working for the past week, but tracking does not seem to function when the app is terminated.

This setup was working back in December when I initially integrated the plugin. However, since March (possibly after recent iOS updates), it has stopped working on my end.

Could you please confirm if it’s still working for you or if there are any changes/workarounds I should be aware of?

I have doubts with Background Fetch integration!!

Thanks in advance!

[ozhanaydin]

Hi, I’m currently testing on iOS in terminated state and will update you once I have a conclusive result.

[BaraaNairatS]

Hi, Thank you for your support regarding this issue. I thought this issue is something that can't be solved because of apple policies. If you found a solution for it will help me a lot. Since tracking the IOS drivers locations in my app is something very important and I was struggling from it after the last update. Many thanks for your continuous support. I will be waiting for your response. BR, [cid:c2cd96b3-c934-41c8-a2b5-81dd6e718834]

…

________________________________ From: OZHAN AYDIN ***@***.***> Sent: Monday, April 6, 2026 9:50 AM To: transistorsoft/flutter_background_geolocation ***@***.***> Cc: Baraa Nairat ***@***.***>; Team mention ***@***.***> Subject: Re: [transistorsoft/flutter_background_geolocation] [Help Wanted]: (Issue #1666) [https://avatars.githubusercontent.com/u/61160731?s=20&v=4]ozhanaydin left a comment (transistorsoft/flutter_background_geolocation#1666)<#1666 (comment)> Hi, I’m currently testing on iOS in terminated state and will update you once I have a conclusive result. — Reply to this email directly, view it on GitHub<#1666 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AX372Y5AADVZWJF2ZAFN4ET4UNHS7AVCNFSM6AAAAACXJ4QVBWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHM2DCOJQG43DIOJYGQ>. You are receiving this because you are on a team that was mentioned.Message ID: ***@***.***>

[EcoTransport]

Hi Can you please remove my email address from these messages. My staff uses your services. My email address is probably because I pay for the account. I don't want these emails being sent. Fredrik Schön Direct +46 (0)40 671 21 49 Office +46 (0)40 671 21 40 Mobile +46 (0)701 81 22 49 E-mail ***@***.******@***.***> Transiro Kamaxelgatan 11 SE-212 41 Malmö www.transiro.com<http://www.transiro.com/> ***@***.*** Från: BaraaNairatS ***@***.***> Skickat: den 6 april 2026 09:08 Till: transistorsoft/flutter_background_geolocation ***@***.***> Kopia: Fredrik Schön ***@***.***>; Team mention ***@***.***> Ämne: Re: [transistorsoft/flutter_background_geolocation] [Help Wanted]: (Issue #1666) [https://avatars.githubusercontent.com/u/100138339?s=20&v=4]BaraaNairatS left a comment (transistorsoft/flutter_background_geolocation#1666)<#1666 (comment)> Hi, Thank you for your support regarding this issue. I thought this issue is something that can't be solved because of apple policies. If you found a solution for it will help me a lot. Since tracking the IOS drivers locations in my app is something very important and I was struggling from it after the last update. Many thanks for your continuous support. I will be waiting for your response. BR, [cid:c2cd96b3-c934-41c8-a2b5-81dd6e718834]

…

________________________________ From: OZHAN AYDIN ***@***.***<mailto:***@***.***>> Sent: Monday, April 6, 2026 9:50 AM To: transistorsoft/flutter_background_geolocation ***@***.***<mailto:***@***.***>> Cc: Baraa Nairat ***@***.***<mailto:***@***.***>>; Team mention ***@***.***<mailto:***@***.***>> Subject: Re: [transistorsoft/flutter_background_geolocation] [Help Wanted]: (Issue #1666) [https://avatars.githubusercontent.com/u/61160731?s=20&v=4]ozhanaydin left a comment (transistorsoft/flutter_background_geolocation#1666)<#1666 (comment)> Hi, I’m currently testing on iOS in terminated state and will update you once I have a conclusive result. — Reply to this email directly, view it on GitHub<#1666 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AX372Y5AADVZWJF2ZAFN4ET4UNHS7AVCNFSM6AAAAACXJ4QVBWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHM2DCOJQG43DIOJYGQ>. You are receiving this because you are on a team that was mentioned.Message ID: ***@***.***<mailto:***@***.***>> — Reply to this email directly, view it on GitHub<#1666 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AQBH6V4IC3JHJPHLTRJLH7T4UNJTNAVCNFSM6AAAAACXJ4QVBWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHM2DCOJQHAZTOOBXHE>. You are receiving this because you are on a team that was mentioned.Message ID: ***@***.******@***.***>>

[indorock]

Hi
Can you please remove my email address from these messages. My staff uses your services. My email address is probably because I pay for the account. I don't want these emails being sent.

Fredrik Schön
Direct
+46 (0)40 671 21 49
Office
+46 (0)40 671 21 40
Mobile
+46 (0)701 81 22 49
E-mail
@.@.>

Transiro
Kamaxelgatan 11
SE-212 41 Malmö
www.transiro.com<http://www.transiro.com/>

@.***

Från: BaraaNairatS @.>
Skickat: den 6 april 2026 09:08
Till: transistorsoft/flutter_background_geolocation @.>
Kopia: Fredrik Schön @.>; Team mention @.>
Ämne: Re: [transistorsoft/flutter_background_geolocation] [Help Wanted]: (Issue #1666)

[https://avatars.githubusercontent.com/u/100138339?s=20&v=4]BaraaNairatS left a comment (transistorsoft/flutter_background_geolocation#1666)<#1666 (comment)>
Hi,
Thank you for your support regarding this issue. I thought this issue is something that can't be solved because of apple policies. If you found a solution for it will help me a lot. Since tracking the IOS drivers locations in my app is something very important and I was struggling from it after the last update.

Many thanks for your continuous support.

I will be waiting for your response.

BR,

[cid:c2cd96b3-c934-41c8-a2b5-81dd6e718834]
…

Just unsubscribe from this discussion.

[radixdt3349]

Hi @herman-the-worm and @ozhanaydin
Have you checked this in iOS?

[ozhanaydin]

"I've resolved the issue on my end. I'm sharing my location_service.dart — feel free to reach out if it doesn't help."

class LocationService {
// -------------------- HEARTBEAT YÖNETİMİ --------------------
static const int HEARTBEAT_ACTIVE = 30;
static const int HEARTBEAT_IDLE = 60;
static const int HEARTBEAT_OFFLINE = 120;

static Future setHeartbeatInterval(String status) async {
int interval;
switch (status) {
case 'active':
interval = HEARTBEAT_ACTIVE;
break;
case 'idle':
interval = HEARTBEAT_IDLE;
break;
case 'offline':
default:
interval = HEARTBEAT_OFFLINE;
}
await bg.BackgroundGeolocation.setConfig(bg.Config(
heartbeatInterval: interval,
));
debugPrint('💓 Heartbeat güncellendi: ${interval}s (durum: $status)');
}

// -------------------- FİZİKSEL AKTİVİTE İZNİ --------------------
static Future requestActivityRecognition() async {
if (kIsWeb) return;
if (Platform.isAndroid) {
final status = await Permission.activityRecognition.request();
if (!status.isGranted) {
debugPrint('⚠️ Fiziksel aktivite izni verilmedi');
}
}
}

// -------------------- ARKA PLAN KONUM BAŞLAT --------------------
static Future start() async {
if (kIsWeb) {
debugPrint('⚠️ Background location sadece mobilde çalışır');
return;
}

// ✅ HEADLESS CALLBACK'İ KAYDET
bg.BackgroundGeolocation.registerHeadlessTask(
    _backgroundGeolocationHeadlessTask);

// ✅ 1. LOCATION EVENT
bg.BackgroundGeolocation.onLocation((bg.Location location) async {
  String? uid;
  try {
    final prefs = await SharedPreferences.getInstance();
    uid = prefs.getString('cached_user_id') ??
        FirebaseAuth.instance.currentUser?.uid;
    if (uid == null) {
      debugPrint('⚠️ Kullanıcı giriş yapmamış veya UID cache yok');
      return;
    }
    await prefs.setString('cached_user_id', uid);
  } catch (e) {
    debugPrint('❌ Auth kontrol hatası: $e');
    return;
  }

  // ✅ Role kontrolü: Firestore'dan oku
  final userSnap = await FirebaseFirestore.instance
      .collection('users')
      .doc(uid)
      .get();
  final role = userSnap.data()?['role'] ?? 'surucu';

  // ✅ Sadece çekiciler için RTDB'ye yaz
  if (role != 'cekici') {
    debugPrint('ℹ️ Sürücü kullanıcı – RTDB konum yazılmadı');
    return;
  }

  // ✅ Role'ü SharedPreferences'a cache'le (headless task için)
  final prefs = await SharedPreferences.getInstance();
  await prefs.setString('cached_user_role', role);

  if (location.mock) {
    await FirebaseFirestore.instance.collection('users').doc(uid).update({
      'isOnline': false,
      'mockDetectedAt': FieldValue.serverTimestamp(),
    });
    debugPrint('❌ Mock location detected – çekici offline yapıldı');
    return;
  }

  final odometerKm = location.odometer / 1000;
  if (odometerKm > 0) {
    debugPrint(
        '🚗 Odometer güncelleniyor: ${odometerKm.toStringAsFixed(2)} km');
    await OdometerService.updateDailyOdometer(odometerKm);
  }

  final speedKmh = (location.coords.speed * 3.6).toInt();

  await FirebaseDatabase.instance.ref('locations/$uid').set({
    'latitude': location.coords.latitude,
    'longitude': location.coords.longitude,
    'accuracy': location.coords.accuracy,
    'speed': location.coords.speed,
    'speedKmh': speedKmh,
    'heading': location.coords.heading,
    'timestamp': DateTime.now().toIso8601String(),
    'role': role,
    'battery': location.battery.level,
    'isCharging': location.battery.isCharging,
    'odometer': odometerKm,
  });

  await LocationPublisher.publishToFirestore(
    userId: uid,
    latitude: location.coords.latitude,
    longitude: location.coords.longitude,
  );

  debugPrint(
      '📍 Konum güncellendi: $speedKmh km/h, batarya: ${location.battery.level}%');

  final schedulerMode = userSnap.data()?['schedulerMode'] ?? false;
  final schedulerOnline = userSnap.data()?['schedulerOnline'] ?? true;
  if (schedulerMode) {
    if (schedulerOnline) {
      debugPrint('📅 Scheduler aktif - Çekici online');
    } else {
      debugPrint('⏸️ Scheduler pasif - Çekici offline');
    }
  }
});

// ✅ 2. MOTION CHANGE EVENT
bg.BackgroundGeolocation.onMotionChange(
        (bg.Location location) async {
      final currentUser = FirebaseAuth.instance.currentUser;
      if (currentUser == null) {
        debugPrint('⚠️ Kullanıcı giriş yapmamış, motion change kaydedilmiyor');
        return;
      }
      final uid = currentUser.uid;
      final userSnap = await FirebaseFirestore.instance
          .collection('users')
          .doc(uid)
          .get();
      final role = userSnap.data()?['role'] ?? 'surucu';
      if (role != 'cekici') return;

      final isMoving = location.isMoving;
      debugPrint(isMoving ? '🚗 Çekici hareket ediyor' : '🛑 Çekici durdu');

      await FirebaseDatabase.instance.ref('locations/$uid').set({
        'latitude': location.coords.latitude,
        'longitude': location.coords.longitude,
        'accuracy': location.coords.accuracy,
        'speed': location.coords.speed,
        'heading': location.coords.heading,
        'timestamp': DateTime.now().toIso8601String(),
        'role': role,
        'isMoving': isMoving,
      });

      await LocationPublisher.publishToFirestore(
        userId: uid,
        latitude: location.coords.latitude,
        longitude: location.coords.longitude,
      );

      if (isMoving) {
        await setHeartbeatInterval('active');
      } else {
        await setHeartbeatInterval('idle');
      }
    });

// ✅ 3. HEARTBEAT
bg.BackgroundGeolocation.onHeartbeat(
        (bg.HeartbeatEvent event) async {
      final currentUser = FirebaseAuth.instance.currentUser;
      if (currentUser == null) {
        debugPrint('⚠️ Kullanıcı giriş yapmamış, heartbeat atlandı');
        return;
      }
      final uid = currentUser.uid;
      debugPrint('💓 HEARTBEAT: $uid -> ${DateTime.now()}');

      try {
        final location =
        await bg.BackgroundGeolocation.getCurrentPosition(
          samples: 1,
          persist: false,
          timeout: 30,
        );

        final userSnap = await FirebaseFirestore.instance
            .collection('users')
            .doc(uid)
            .get();
        final role = userSnap.data()?['role'] ?? 'surucu';
        if (role != 'cekici') return;

        await FirebaseDatabase.instance.ref('locations/$uid').set({
          'latitude': location.coords.latitude,
          'longitude': location.coords.longitude,
          'accuracy': location.coords.accuracy,
          'speed': location.coords.speed,
          'heading': location.coords.heading,
          'timestamp': DateTime.now().toIso8601String(),
          'role': role,
          'source': 'heartbeat',
        });

        await LocationPublisher.publishToFirestore(
          userId: uid,
          latitude: location.coords.latitude,
          longitude: location.coords.longitude,
        );

        debugPrint('💓 Heartbeat konumu kaydedildi (RTDB + Firestore)');
      } catch (e) {
        debugPrint('❌ Heartbeat hatası: $e');
      }
    });

// ✅ 4. GEOFENCE EVENT
bg.BackgroundGeolocation.onGeofence((bg.GeofenceEvent event) async {
  debugPrint('🎯 GEOFENCE EVENT: ${event.identifier} - ${event.action}');
  if (event.action == 'ENTER' &&
      event.identifier.startsWith('customer_')) {
    final requestId =
    event.identifier.replaceFirst('customer_', '');
    debugPrint('📍 Müşteri adresine yaklaşıldı: $requestId');
    await GeofenceService.sendArrivingNotification(requestId);
    await GeofenceService.removeCustomerGeofence(requestId);
  }
});

// ✅ 5. CONFIG
bg.State state = await bg.BackgroundGeolocation.ready(bg.Config(
  desiredAccuracy: bg.Config.DESIRED_ACCURACY_HIGH,
  distanceFilter: 30,
  disableElasticity: false,
  stopOnTerminate: false,
  startOnBoot: true,
  debug: false,
  enableHeadless: true,
  logLevel: bg.Config.LOG_LEVEL_VERBOSE,
  preventSuspend: true,
  geofenceProximityRadius: 1500,
  geofenceModeHighAccuracy: true,
  heartbeatInterval: 60,
  locationUpdateInterval: 10 * 1000,
  fastestLocationUpdateInterval: 5 * 1000,
  persistMode: bg.Config.PERSIST_MODE_LOCATION,
  stopTimeout: 3,
  stopOnStationary: false,
  disableMotionActivityUpdates: false,
  disableStopDetection: false,
  foregroundService: true,
  notification: bg.Notification(
    title: "En Hızlı Çekici",
    text: "Konumunuz arka planda alınıyor",
    priority: bg.NotificationPriority.high,
    sticky: true,
  ),
  locationAuthorizationRequest: 'Always',
  backgroundPermissionRationale: bg.PermissionRationale(
    title: "Arka plan konum izni gerekiyor",
    message:
    "Yeni talepleri hızlı göstermek için uygulama kapalıyken bile konumunuza erişim gerekir.",
    positiveAction: "Ayarlara Git",
    negativeAction: "Vazgeç",
  ),
));

if (!state.enabled) {
  bg.BackgroundGeolocation.start();
}

await requestActivityRecognition();

}

// ✅ Konum servisini durdur
static Future stop() async {
if (kIsWeb) return;
try {
await bg.BackgroundGeolocation.stop();
debugPrint('🛑 LocationService durduruldu');
} catch (e) {
debugPrint('❌ LocationService durdurma hatası: $e');
}
}
}

// -------------------- HEADLESS CALLBACK (GLOBAL FONKSIYON) --------------------
@pragma('vm:entry-point')
void _backgroundGeolocationHeadlessTask(
bg.HeadlessEvent headlessEvent) async {
print('🎯 [HeadlessTask] Event: ${headlessEvent.name}');

try {
await Firebase.initializeApp(
options: DefaultFirebaseOptions.currentPlatform,
);
} catch (e) {
print('ℹ️ [HeadlessTask] Firebase zaten başlatılmış: $e');
}

final prefs = await SharedPreferences.getInstance();
final cachedRole = prefs.getString('cached_user_role') ?? 'surucu';
if (cachedRole != 'cekici') {
print('ℹ️ [HeadlessTask] Sürücü kullanıcı – konum yazılmadı, atlanıyor');
return;
}

final uid = prefs.getString('cached_user_id');
if (uid == null) {
print('❌ [HeadlessTask] UID bulunamadı');
return;
}

switch (headlessEvent.name) {
case bg.Event.LOCATION:
bg.Location location = headlessEvent.event;
try {
print(
'📍 [HeadlessTask] Konum: ${location.coords.latitude}, ${location.coords.longitude}');
final database = FirebaseDatabase.instance;
final speedKmh = (location.coords.speed * 3.6).toInt();
await database.ref('locations/$uid').set({
'latitude': location.coords.latitude,
'longitude': location.coords.longitude,
'accuracy': location.coords.accuracy,
'speed': location.coords.speed,
'speedKmh': speedKmh,
'heading': location.coords.heading,
'timestamp': DateTime.now().toIso8601String(),
'role': cachedRole,
'battery': location.battery.level,
'isCharging': location.battery.isCharging,
'source': 'headless-location',
});
print('✅ [HeadlessTask] Konum RTDB'ye yazıldı');
} catch (e) {
print('❌ [HeadlessTask] Hata: $e');
}
break;

case bg.Event.HEARTBEAT:
  print('💓 [HeadlessTask] Heartbeat');
  try {
    final location =
    await bg.BackgroundGeolocation.getCurrentPosition(
      samples: 1,
      persist: false,
      timeout: 30,
    );
    final database = FirebaseDatabase.instance;
    final speedKmh = (location.coords.speed * 3.6).toInt();
    await database.ref('locations/$uid').set({
      'latitude': location.coords.latitude,
      'longitude': location.coords.longitude,
      'accuracy': location.coords.accuracy,
      'speed': location.coords.speed,
      'speedKmh': speedKmh,
      'heading': location.coords.heading,
      'timestamp': DateTime.now().toIso8601String(),
      'role': cachedRole,
      'battery': location.battery.level,
      'isCharging': location.battery.isCharging,
      'source': 'headless-heartbeat',
    });
    final firestore = FirebaseFirestore.instance;
    await firestore.collection('locations').doc(uid).set({
      'latitude': location.coords.latitude,
      'longitude': location.coords.longitude,
      'timestamp': FieldValue.serverTimestamp(),
      'lastUpdated': DateTime.now().toIso8601String(),
      'role': cachedRole,
      'userId': uid,
    }, SetOptions(merge: true));
    print('✅ [HeadlessTask] Heartbeat konumu yazıldı');
  } catch (e) {
    print('❌ [HeadlessTask] Heartbeat hatası: $e');
  }
  break;

case bg.Event.GEOFENCE:
  print('🎯 [HeadlessTask] Geofence');
  break;

}
}

[christocracy]

@ozhanaydin why are you spamming this issue with completely unrelated posts on a thread where a guy is reaching out to the community with a consulting job posting?

Hi FBG community,

Perhaps an unconventional post for this github, but I’m looking to hire a developer experienced with FBG.

I'm a PhD student at the University of Connecticut developing a longitudinal research application that employs FBG for location tracking on iOS/Android in background and on-terminate. The system is active now and working well overall in a release build, but I am looking for a developer with experience using FBG to audit my implementation before final release. It’s about 2000 lines of code total.

[ozhanaydin]

Apologies, I misunderstood the thread's purpose. Won't happen again.

[radixdt3349]

Hi @ozhanaydin ,
I have raised the ticket for the same purpose. I will reach out there.
#1665