Android AltBeacon background and foreground together

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Good day. In my application i want to use background and foreground beacons scan. For this task i used AltBeacon library. But after device reboot background scan not starts.

My algorith looks like:

When application started, start monitor and attach lifecycle listener
for detect when activity dies.

When activity dies - start background scan.

When activity goes back to front - stop backgroun and run foreground.

What i have now:

At first - foreground "service" (not really service, just class)

class BeaconForegroundService(private val application: Application) : BeaconConsumer {



private var beaconManager: BeaconManager? = null



companion object {

    private const val REGION_UID = "region_uid"

}



override fun getApplicationContext(): Context {

    return application.applicationContext

}



override fun unbindService(p0: ServiceConnection) {

    application.unbindService(p0)

}



override fun bindService(p0: Intent, p1: ServiceConnection, p2: Int): Boolean {

    return application.bindService(p0, p1, p2)

}



override fun onBeaconServiceConnect() {



    beaconManager!!.beaconParsers.clear()

    beaconManager!!.beaconParsers.add(AltBeaconParser())

    beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.URI_BEACON_LAYOUT))

    beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_TLM_LAYOUT))

    beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_UID_LAYOUT))

    beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_URL_LAYOUT))

    beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25"))

    beaconManager!!.backgroundMode = false



    beaconManager!!.addMonitorNotifier(object : MonitorNotifier {

        override fun didDetermineStateForRegion(p0: Int, p1: Region?) {

            Timber.d("FGBeacon: didDetermineStateForRegion INSIDE = ${p0 == MonitorNotifier.INSIDE}")

        }



        override fun didEnterRegion(p0: Region?) {

            Timber.d("FGBeacon: didEnterRegion")

        }



        override fun didExitRegion(p0: Region?) {

            Timber.d("FGBeacon: didExitRegion")

        }

    })

    beaconManager!!.addRangeNotifier { mutableCollection: MutableCollection<Beacon>, region: Region ->

        Timber.d("FGBeacon $mutableCollection")

    }

    beaconManager!!.startMonitoringBeaconsInRegion(Region(REGION_UID, null, null, null))

    beaconManager!!.startRangingBeaconsInRegion(Region(REGION_UID, null, null, null))

}



fun startScan() {

    beaconManager = BeaconManager.getInstanceForApplication(application)

    beaconManager!!.bind(this)

}



fun stopScan() {

    beaconManager?.unbind(this)

}

}

Background scan inside application class:

class MyApplication : Application(), BootstrapNotifier {



// Fields

private var beaconManager: BeaconManager? = null

private var backgroundPowerSaver: BackgroundPowerSaver ?= null

private var regionBootstrap : RegionBootstrap ?= null

private var foregroundService: BeaconForegroundService ?= null

val REGION_UID = "region_uid"



//Method for start background scan here



fun startScan() {

        beaconManager = BeaconManager.getInstanceForApplication(this)

        beaconManager!!.beaconParsers.clear()

        beaconManager!!.beaconParsers.add(AltBeaconParser())

        beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.URI_BEACON_LAYOUT))

        beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_TLM_LAYOUT))

        beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_UID_LAYOUT))

        beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_URL_LAYOUT))

        beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25"))



        val notificationBuilder = Notification.Builder(this)

        notificationBuilder.setSmallIcon(R.drawable.ic_launcher_foreground)

        notificationBuilder.setContentTitle("Scanning for beacons")

        val intent = Intent(this, MainActivity::class.java)

        val pendingIntent = PendingIntent.getActivity(this, MainActivity.BEACON_REQUEST_CODE, intent, PendingIntent.FLAG_UPDATE_CURRENT)

        notificationBuilder.setContentIntent(pendingIntent)



        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

            val channel = NotificationChannel("MyChannelId", "NotyName", NotificationManager.IMPORTANCE_DEFAULT)

            channel.description = "NotyDesc"

            val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

            notificationManager.createNotificationChannel(channel)

            notificationBuilder.setChannelId(channel.id)

        }









        val region = Region(REGION_UID, null, null, null)



        beaconManager!!.enableForegroundServiceScanning(notificationBuilder.build(), 456)

        beaconManager!!.setEnableScheduledScanJobs(false)

        beaconManager!!.backgroundBetweenScanPeriod = 0

        beaconManager!!.backgroundScanPeriod = TimeUnit.SECONDS.toMillis(5)

        beaconManager!!.backgroundMode = true



        regionBootstrap  = RegionBootstrap(this, region)

        backgroundPowerSaver = BackgroundPowerSaver(this)



        beaconManager!!.addRangeNotifier { mutableCollection: MutableCollection<Beacon>, r: Region ->

            Timber.d("PBeacon $mutableCollection")

        }

    }



//Disable background scan if application start in foreground

fun disableMonitoring() {

        regionBootstrap?.disable()

        regionBootstrap = null

        beaconManager?.removeAllRangeNotifiers()

    }



  override fun didDetermineStateForRegion(p0: Int, p1: Region?) {

        Timber.d("PBeacon: StateForRegion INSIDE = ${p0 == MonitorNotifier.INSIDE}")

    }



//Start ranging if we inside region

    override fun didEnterRegion(p0: Region?) {

        Timber.d("PBeacon: I see a beacon first time")

        beaconManager!!.startRangingBeaconsInRegion(Region(REGION_UID, null, null, null))



    }



//Stop ranging if we move out from region

    override fun didExitRegion(p0: Region?) {

        Timber.d("PBeacon : I no longer see a beacon.")

        beaconManager!!.stopRangingBeaconsInRegion(Region(REGION_UID, null, null, null))

    }

And finally - registered listener for detect foreground/background app state changes (inside onCreate of application)

registerActivityLifecycleCallbacks(object : ActivityLifecycleCallbacks {



            //Stop background scan and start foreground

            override fun onActivityStarted(activity: Activity?) {

                disableMonitoring() 



                foregroundService = BeaconForegroundService(this@MyApplication)

                foregroundService!!.startScan()

            }



              //Stop foreground scan and start background

              override fun onActivityStopped(activity: Activity?) {

                foregroundService?.stopScan()

                foregroundService = null



                startScan()

            }



        })

Logs here:

Logs when application starting in foreground (looks fine)

D/BeaconParser: Parsing beacon layout: m:2-3=beac,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25

D/BeaconParser: Parsing beacon layout: m:2-3=beac,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25

D/BeaconParser: Parsing beacon layout: s:0-1=fed8,m:2-2=00,p:3-3:-41,i:4-21v

D/BeaconParser: Parsing beacon layout: x,s:0-1=feaa,m:2-2=20,d:3-3,d:4-5,d:6-7,d:8-11,d:12-15

D/BeaconParser: Parsing beacon layout: s:0-1=feaa,m:2-2=00,p:3-3:-41,i:4-13,i:14-19

D/BeaconParser: Parsing beacon layout: s:0-1=feaa,m:2-2=10,p:3-3:-41,i:4-21v

D/BeaconParser: Parsing beacon layout: m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25

....

BeaconForegroundService$onBeaconServiceConnect: [id1: b5b182c7-eab1-4988-aa99-b5c1517008d9 id2: 1 id3: 57197]

Close app (background mode?):

Processing pdu type FF: 0201061aff4c000215b5b182c7eab14988aa99b5c1517008d90001df6dc50d0961626561636f6e5f36444446000000000000000000000000000000000000 with startIndex: 5, endIndex: 29

D/BeaconParser: This is not a matching Beacon advertisement. Was expecting aa fe at offset 5 and 20 at offset 7.  The bytes I see are: 0201061aff4c000215b5b182c7eab14988aa99b5c1517008d90001df6dc50d0961626561636f6e5f36444446000000000000000000000000000000000000

 D/BeaconParser: Ignoring pdu type 01

...

 D/BeaconParser: Processing pdu type FF: 0201061aff4c000215b5b182c7eab14988aa99b5c1517008d90001df6dc50d0961626561636f6e5f36444446000000000000000000000000000000000000 with startIndex: 5, endIndex: 29

D/BeaconParser: This is a recognized beacon advertisement -- 02 15 seen

D/BeaconParser: Bytes are: 0201061aff4c000215b5b182c7eab14988aa99b5c1517008d90001df6dc50d0961626561636f6e5f36444446000000000000000000000000000000000000

D/ScanHelper: Beacon packet detected for: id1: b5b182c7-eab1-4988-aa99-b5c1517008d9 id2: 1 id3: 57197 with rssi -46

D/RangeState: adding id1: b5b182c7-eab1-4988-aa99-b5c1517008d9 id2: 1 id3: 57197 to existing range for: org.altbeacon.beacon.service.RangedBeacon@332c859

After reboot:

I/BeaconManager: BeaconManager started up on pid 7407 named 'com.myapp' for application package 'com.myapp'.  isMainProcess=true

D/BeaconParser: Parsing beacon layout: m:2-3=beac,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25

And that's all. No detections, waiting (20+ minutes)

Is it bug of library/device or i doing something wrong?

Can we use background scan without notification?

Whan we start application again (to foreground) notification refreshed. How can i avoid this?

Big thanks

asked Nov 22 at 16:34

Yuriy Aizenberg

161421

1

Try moving the startRanginfBeaconsInRegion() call inside the didDetermineStateForRegion method. After restart, the region state is persisted, so you will not get a new call to didEnterRegion if you were already inside when the app last was running. The didDetermineState callback is always made on restart so it is a good place to trigger starting ranging..
– davidgyoung
Nov 22 at 17:42

1

Also, make sure the startScan() call is triggered in the Application class' onCreate method, and verify by debug lines that it gets called.
– davidgyoung
Nov 23 at 0:04

1

If you are using Android 8+, make sure you have library version 2.15.2 or higher (the version shows up in the logs) otherwise starting a foreground service in the background won't work. See: github.com/AltBeacon/android-beacon-library/pull/746
– davidgyoung
Nov 23 at 0:23

@davidgyoung Thanks for the reply. Unfortunately, not working. Lib version - 2.15.2 onCreate of application not called. I move startRangingBeaconsInRegion inside didDetermineStateForRegion callback method, but after reboot still not started.
– Yuriy Aizenberg
Nov 23 at 15:22

@davidgyoung So i took code from example (github.com/AltBeacon/android-beacon-library-reference/blob/…) and now scanner work after reboot! But no beacons found :( I see that didDetermineStateForRegion always has first arg = 0, it's "OUTSIDE". D/BeaconService: Currently monitoring 1 regions. I/BeaconService: stop ranging received D/BeaconService: Currently ranging 0 regions.
– Yuriy Aizenberg
Nov 23 at 16:51

|
show 1 more comment

up vote
0
down vote

favorite

Good day. In my application i want to use background and foreground beacons scan. For this task i used AltBeacon library. But after device reboot background scan not starts.

My algorith looks like:

When application started, start monitor and attach lifecycle listener
for detect when activity dies.

When activity dies - start background scan.

When activity goes back to front - stop backgroun and run foreground.

What i have now:

At first - foreground "service" (not really service, just class)

class BeaconForegroundService(private val application: Application) : BeaconConsumer {



private var beaconManager: BeaconManager? = null



companion object {

    private const val REGION_UID = "region_uid"

}



override fun getApplicationContext(): Context {

    return application.applicationContext

}



override fun unbindService(p0: ServiceConnection) {

    application.unbindService(p0)

}



override fun bindService(p0: Intent, p1: ServiceConnection, p2: Int): Boolean {

    return application.bindService(p0, p1, p2)

}



override fun onBeaconServiceConnect() {



    beaconManager!!.beaconParsers.clear()

    beaconManager!!.beaconParsers.add(AltBeaconParser())

    beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.URI_BEACON_LAYOUT))

    beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_TLM_LAYOUT))

    beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_UID_LAYOUT))

    beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_URL_LAYOUT))

    beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25"))

    beaconManager!!.backgroundMode = false



    beaconManager!!.addMonitorNotifier(object : MonitorNotifier {

        override fun didDetermineStateForRegion(p0: Int, p1: Region?) {

            Timber.d("FGBeacon: didDetermineStateForRegion INSIDE = ${p0 == MonitorNotifier.INSIDE}")

        }



        override fun didEnterRegion(p0: Region?) {

            Timber.d("FGBeacon: didEnterRegion")

        }



        override fun didExitRegion(p0: Region?) {

            Timber.d("FGBeacon: didExitRegion")

        }

    })

    beaconManager!!.addRangeNotifier { mutableCollection: MutableCollection<Beacon>, region: Region ->

        Timber.d("FGBeacon $mutableCollection")

    }

    beaconManager!!.startMonitoringBeaconsInRegion(Region(REGION_UID, null, null, null))

    beaconManager!!.startRangingBeaconsInRegion(Region(REGION_UID, null, null, null))

}



fun startScan() {

    beaconManager = BeaconManager.getInstanceForApplication(application)

    beaconManager!!.bind(this)

}



fun stopScan() {

    beaconManager?.unbind(this)

}

}

Background scan inside application class:

class MyApplication : Application(), BootstrapNotifier {



// Fields

private var beaconManager: BeaconManager? = null

private var backgroundPowerSaver: BackgroundPowerSaver ?= null

private var regionBootstrap : RegionBootstrap ?= null

private var foregroundService: BeaconForegroundService ?= null

val REGION_UID = "region_uid"



//Method for start background scan here



fun startScan() {

        beaconManager = BeaconManager.getInstanceForApplication(this)

        beaconManager!!.beaconParsers.clear()

        beaconManager!!.beaconParsers.add(AltBeaconParser())

        beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.URI_BEACON_LAYOUT))

        beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_TLM_LAYOUT))

        beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_UID_LAYOUT))

        beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_URL_LAYOUT))

        beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25"))



        val notificationBuilder = Notification.Builder(this)

        notificationBuilder.setSmallIcon(R.drawable.ic_launcher_foreground)

        notificationBuilder.setContentTitle("Scanning for beacons")

        val intent = Intent(this, MainActivity::class.java)

        val pendingIntent = PendingIntent.getActivity(this, MainActivity.BEACON_REQUEST_CODE, intent, PendingIntent.FLAG_UPDATE_CURRENT)

        notificationBuilder.setContentIntent(pendingIntent)



        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

            val channel = NotificationChannel("MyChannelId", "NotyName", NotificationManager.IMPORTANCE_DEFAULT)

            channel.description = "NotyDesc"

            val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

            notificationManager.createNotificationChannel(channel)

            notificationBuilder.setChannelId(channel.id)

        }









        val region = Region(REGION_UID, null, null, null)



        beaconManager!!.enableForegroundServiceScanning(notificationBuilder.build(), 456)

        beaconManager!!.setEnableScheduledScanJobs(false)

        beaconManager!!.backgroundBetweenScanPeriod = 0

        beaconManager!!.backgroundScanPeriod = TimeUnit.SECONDS.toMillis(5)

        beaconManager!!.backgroundMode = true



        regionBootstrap  = RegionBootstrap(this, region)

        backgroundPowerSaver = BackgroundPowerSaver(this)



        beaconManager!!.addRangeNotifier { mutableCollection: MutableCollection<Beacon>, r: Region ->

            Timber.d("PBeacon $mutableCollection")

        }

    }



//Disable background scan if application start in foreground

fun disableMonitoring() {

        regionBootstrap?.disable()

        regionBootstrap = null

        beaconManager?.removeAllRangeNotifiers()

    }



  override fun didDetermineStateForRegion(p0: Int, p1: Region?) {

        Timber.d("PBeacon: StateForRegion INSIDE = ${p0 == MonitorNotifier.INSIDE}")

    }



//Start ranging if we inside region

    override fun didEnterRegion(p0: Region?) {

        Timber.d("PBeacon: I see a beacon first time")

        beaconManager!!.startRangingBeaconsInRegion(Region(REGION_UID, null, null, null))



    }



//Stop ranging if we move out from region

    override fun didExitRegion(p0: Region?) {

        Timber.d("PBeacon : I no longer see a beacon.")

        beaconManager!!.stopRangingBeaconsInRegion(Region(REGION_UID, null, null, null))

    }

And finally - registered listener for detect foreground/background app state changes (inside onCreate of application)

registerActivityLifecycleCallbacks(object : ActivityLifecycleCallbacks {



            //Stop background scan and start foreground

            override fun onActivityStarted(activity: Activity?) {

                disableMonitoring() 



                foregroundService = BeaconForegroundService(this@MyApplication)

                foregroundService!!.startScan()

            }



              //Stop foreground scan and start background

              override fun onActivityStopped(activity: Activity?) {

                foregroundService?.stopScan()

                foregroundService = null



                startScan()

            }



        })

Logs here:

Logs when application starting in foreground (looks fine)

D/BeaconParser: Parsing beacon layout: m:2-3=beac,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25

D/BeaconParser: Parsing beacon layout: m:2-3=beac,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25

D/BeaconParser: Parsing beacon layout: s:0-1=fed8,m:2-2=00,p:3-3:-41,i:4-21v

D/BeaconParser: Parsing beacon layout: x,s:0-1=feaa,m:2-2=20,d:3-3,d:4-5,d:6-7,d:8-11,d:12-15

D/BeaconParser: Parsing beacon layout: s:0-1=feaa,m:2-2=00,p:3-3:-41,i:4-13,i:14-19

D/BeaconParser: Parsing beacon layout: s:0-1=feaa,m:2-2=10,p:3-3:-41,i:4-21v

D/BeaconParser: Parsing beacon layout: m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25

....

BeaconForegroundService$onBeaconServiceConnect: [id1: b5b182c7-eab1-4988-aa99-b5c1517008d9 id2: 1 id3: 57197]

Close app (background mode?):

Processing pdu type FF: 0201061aff4c000215b5b182c7eab14988aa99b5c1517008d90001df6dc50d0961626561636f6e5f36444446000000000000000000000000000000000000 with startIndex: 5, endIndex: 29

D/BeaconParser: This is not a matching Beacon advertisement. Was expecting aa fe at offset 5 and 20 at offset 7.  The bytes I see are: 0201061aff4c000215b5b182c7eab14988aa99b5c1517008d90001df6dc50d0961626561636f6e5f36444446000000000000000000000000000000000000

 D/BeaconParser: Ignoring pdu type 01

...

 D/BeaconParser: Processing pdu type FF: 0201061aff4c000215b5b182c7eab14988aa99b5c1517008d90001df6dc50d0961626561636f6e5f36444446000000000000000000000000000000000000 with startIndex: 5, endIndex: 29

D/BeaconParser: This is a recognized beacon advertisement -- 02 15 seen

D/BeaconParser: Bytes are: 0201061aff4c000215b5b182c7eab14988aa99b5c1517008d90001df6dc50d0961626561636f6e5f36444446000000000000000000000000000000000000

D/ScanHelper: Beacon packet detected for: id1: b5b182c7-eab1-4988-aa99-b5c1517008d9 id2: 1 id3: 57197 with rssi -46

D/RangeState: adding id1: b5b182c7-eab1-4988-aa99-b5c1517008d9 id2: 1 id3: 57197 to existing range for: org.altbeacon.beacon.service.RangedBeacon@332c859

After reboot:

I/BeaconManager: BeaconManager started up on pid 7407 named 'com.myapp' for application package 'com.myapp'.  isMainProcess=true

D/BeaconParser: Parsing beacon layout: m:2-3=beac,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25

And that's all. No detections, waiting (20+ minutes)

Is it bug of library/device or i doing something wrong?

Can we use background scan without notification?

Whan we start application again (to foreground) notification refreshed. How can i avoid this?

Big thanks

asked Nov 22 at 16:34

Yuriy Aizenberg

161421

1

Try moving the startRanginfBeaconsInRegion() call inside the didDetermineStateForRegion method. After restart, the region state is persisted, so you will not get a new call to didEnterRegion if you were already inside when the app last was running. The didDetermineState callback is always made on restart so it is a good place to trigger starting ranging..
– davidgyoung
Nov 22 at 17:42

1

Also, make sure the startScan() call is triggered in the Application class' onCreate method, and verify by debug lines that it gets called.
– davidgyoung
Nov 23 at 0:04

1

If you are using Android 8+, make sure you have library version 2.15.2 or higher (the version shows up in the logs) otherwise starting a foreground service in the background won't work. See: github.com/AltBeacon/android-beacon-library/pull/746
– davidgyoung
Nov 23 at 0:23

@davidgyoung Thanks for the reply. Unfortunately, not working. Lib version - 2.15.2 onCreate of application not called. I move startRangingBeaconsInRegion inside didDetermineStateForRegion callback method, but after reboot still not started.
– Yuriy Aizenberg
Nov 23 at 15:22

@davidgyoung So i took code from example (github.com/AltBeacon/android-beacon-library-reference/blob/…) and now scanner work after reboot! But no beacons found :( I see that didDetermineStateForRegion always has first arg = 0, it's "OUTSIDE". D/BeaconService: Currently monitoring 1 regions. I/BeaconService: stop ranging received D/BeaconService: Currently ranging 0 regions.
– Yuriy Aizenberg
Nov 23 at 16:51

|
show 1 more comment

up vote
0
down vote

favorite

Good day. In my application i want to use background and foreground beacons scan. For this task i used AltBeacon library. But after device reboot background scan not starts.

My algorith looks like:

When application started, start monitor and attach lifecycle listener
for detect when activity dies.

When activity dies - start background scan.

When activity goes back to front - stop backgroun and run foreground.

What i have now:

At first - foreground "service" (not really service, just class)

class BeaconForegroundService(private val application: Application) : BeaconConsumer {



private var beaconManager: BeaconManager? = null



companion object {

    private const val REGION_UID = "region_uid"

}



override fun getApplicationContext(): Context {

    return application.applicationContext

}



override fun unbindService(p0: ServiceConnection) {

    application.unbindService(p0)

}



override fun bindService(p0: Intent, p1: ServiceConnection, p2: Int): Boolean {

    return application.bindService(p0, p1, p2)

}



override fun onBeaconServiceConnect() {



    beaconManager!!.beaconParsers.clear()

    beaconManager!!.beaconParsers.add(AltBeaconParser())

    beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.URI_BEACON_LAYOUT))

    beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_TLM_LAYOUT))

    beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_UID_LAYOUT))

    beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_URL_LAYOUT))

    beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25"))

    beaconManager!!.backgroundMode = false



    beaconManager!!.addMonitorNotifier(object : MonitorNotifier {

        override fun didDetermineStateForRegion(p0: Int, p1: Region?) {

            Timber.d("FGBeacon: didDetermineStateForRegion INSIDE = ${p0 == MonitorNotifier.INSIDE}")

        }



        override fun didEnterRegion(p0: Region?) {

            Timber.d("FGBeacon: didEnterRegion")

        }



        override fun didExitRegion(p0: Region?) {

            Timber.d("FGBeacon: didExitRegion")

        }

    })

    beaconManager!!.addRangeNotifier { mutableCollection: MutableCollection<Beacon>, region: Region ->

        Timber.d("FGBeacon $mutableCollection")

    }

    beaconManager!!.startMonitoringBeaconsInRegion(Region(REGION_UID, null, null, null))

    beaconManager!!.startRangingBeaconsInRegion(Region(REGION_UID, null, null, null))

}



fun startScan() {

    beaconManager = BeaconManager.getInstanceForApplication(application)

    beaconManager!!.bind(this)

}



fun stopScan() {

    beaconManager?.unbind(this)

}

}

Background scan inside application class:

class MyApplication : Application(), BootstrapNotifier {



// Fields

private var beaconManager: BeaconManager? = null

private var backgroundPowerSaver: BackgroundPowerSaver ?= null

private var regionBootstrap : RegionBootstrap ?= null

private var foregroundService: BeaconForegroundService ?= null

val REGION_UID = "region_uid"



//Method for start background scan here



fun startScan() {

        beaconManager = BeaconManager.getInstanceForApplication(this)

        beaconManager!!.beaconParsers.clear()

        beaconManager!!.beaconParsers.add(AltBeaconParser())

        beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.URI_BEACON_LAYOUT))

        beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_TLM_LAYOUT))

        beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_UID_LAYOUT))

        beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_URL_LAYOUT))

        beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25"))



        val notificationBuilder = Notification.Builder(this)

        notificationBuilder.setSmallIcon(R.drawable.ic_launcher_foreground)

        notificationBuilder.setContentTitle("Scanning for beacons")

        val intent = Intent(this, MainActivity::class.java)

        val pendingIntent = PendingIntent.getActivity(this, MainActivity.BEACON_REQUEST_CODE, intent, PendingIntent.FLAG_UPDATE_CURRENT)

        notificationBuilder.setContentIntent(pendingIntent)



        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

            val channel = NotificationChannel("MyChannelId", "NotyName", NotificationManager.IMPORTANCE_DEFAULT)

            channel.description = "NotyDesc"

            val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

            notificationManager.createNotificationChannel(channel)

            notificationBuilder.setChannelId(channel.id)

        }









        val region = Region(REGION_UID, null, null, null)



        beaconManager!!.enableForegroundServiceScanning(notificationBuilder.build(), 456)

        beaconManager!!.setEnableScheduledScanJobs(false)

        beaconManager!!.backgroundBetweenScanPeriod = 0

        beaconManager!!.backgroundScanPeriod = TimeUnit.SECONDS.toMillis(5)

        beaconManager!!.backgroundMode = true



        regionBootstrap  = RegionBootstrap(this, region)

        backgroundPowerSaver = BackgroundPowerSaver(this)



        beaconManager!!.addRangeNotifier { mutableCollection: MutableCollection<Beacon>, r: Region ->

            Timber.d("PBeacon $mutableCollection")

        }

    }



//Disable background scan if application start in foreground

fun disableMonitoring() {

        regionBootstrap?.disable()

        regionBootstrap = null

        beaconManager?.removeAllRangeNotifiers()

    }



  override fun didDetermineStateForRegion(p0: Int, p1: Region?) {

        Timber.d("PBeacon: StateForRegion INSIDE = ${p0 == MonitorNotifier.INSIDE}")

    }



//Start ranging if we inside region

    override fun didEnterRegion(p0: Region?) {

        Timber.d("PBeacon: I see a beacon first time")

        beaconManager!!.startRangingBeaconsInRegion(Region(REGION_UID, null, null, null))



    }



//Stop ranging if we move out from region

    override fun didExitRegion(p0: Region?) {

        Timber.d("PBeacon : I no longer see a beacon.")

        beaconManager!!.stopRangingBeaconsInRegion(Region(REGION_UID, null, null, null))

    }

And finally - registered listener for detect foreground/background app state changes (inside onCreate of application)

registerActivityLifecycleCallbacks(object : ActivityLifecycleCallbacks {



            //Stop background scan and start foreground

            override fun onActivityStarted(activity: Activity?) {

                disableMonitoring() 



                foregroundService = BeaconForegroundService(this@MyApplication)

                foregroundService!!.startScan()

            }



              //Stop foreground scan and start background

              override fun onActivityStopped(activity: Activity?) {

                foregroundService?.stopScan()

                foregroundService = null



                startScan()

            }



        })

Logs here:

Logs when application starting in foreground (looks fine)

D/BeaconParser: Parsing beacon layout: m:2-3=beac,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25

D/BeaconParser: Parsing beacon layout: m:2-3=beac,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25

D/BeaconParser: Parsing beacon layout: s:0-1=fed8,m:2-2=00,p:3-3:-41,i:4-21v

D/BeaconParser: Parsing beacon layout: x,s:0-1=feaa,m:2-2=20,d:3-3,d:4-5,d:6-7,d:8-11,d:12-15

D/BeaconParser: Parsing beacon layout: s:0-1=feaa,m:2-2=00,p:3-3:-41,i:4-13,i:14-19

D/BeaconParser: Parsing beacon layout: s:0-1=feaa,m:2-2=10,p:3-3:-41,i:4-21v

D/BeaconParser: Parsing beacon layout: m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25

....

BeaconForegroundService$onBeaconServiceConnect: [id1: b5b182c7-eab1-4988-aa99-b5c1517008d9 id2: 1 id3: 57197]

Close app (background mode?):

Processing pdu type FF: 0201061aff4c000215b5b182c7eab14988aa99b5c1517008d90001df6dc50d0961626561636f6e5f36444446000000000000000000000000000000000000 with startIndex: 5, endIndex: 29

D/BeaconParser: This is not a matching Beacon advertisement. Was expecting aa fe at offset 5 and 20 at offset 7.  The bytes I see are: 0201061aff4c000215b5b182c7eab14988aa99b5c1517008d90001df6dc50d0961626561636f6e5f36444446000000000000000000000000000000000000

 D/BeaconParser: Ignoring pdu type 01

...

 D/BeaconParser: Processing pdu type FF: 0201061aff4c000215b5b182c7eab14988aa99b5c1517008d90001df6dc50d0961626561636f6e5f36444446000000000000000000000000000000000000 with startIndex: 5, endIndex: 29

D/BeaconParser: This is a recognized beacon advertisement -- 02 15 seen

D/BeaconParser: Bytes are: 0201061aff4c000215b5b182c7eab14988aa99b5c1517008d90001df6dc50d0961626561636f6e5f36444446000000000000000000000000000000000000

D/ScanHelper: Beacon packet detected for: id1: b5b182c7-eab1-4988-aa99-b5c1517008d9 id2: 1 id3: 57197 with rssi -46

D/RangeState: adding id1: b5b182c7-eab1-4988-aa99-b5c1517008d9 id2: 1 id3: 57197 to existing range for: org.altbeacon.beacon.service.RangedBeacon@332c859

After reboot:

I/BeaconManager: BeaconManager started up on pid 7407 named 'com.myapp' for application package 'com.myapp'.  isMainProcess=true

D/BeaconParser: Parsing beacon layout: m:2-3=beac,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25

And that's all. No detections, waiting (20+ minutes)

Is it bug of library/device or i doing something wrong?

Can we use background scan without notification?

Whan we start application again (to foreground) notification refreshed. How can i avoid this?

Big thanks

asked Nov 22 at 16:34

Yuriy Aizenberg

161421

Good day. In my application i want to use background and foreground beacons scan. For this task i used AltBeacon library. But after device reboot background scan not starts.

My algorith looks like:

When application started, start monitor and attach lifecycle listener
for detect when activity dies.

When activity dies - start background scan.

When activity goes back to front - stop backgroun and run foreground.

What i have now:

At first - foreground "service" (not really service, just class)

class BeaconForegroundService(private val application: Application) : BeaconConsumer {



private var beaconManager: BeaconManager? = null



companion object {

    private const val REGION_UID = "region_uid"

}



override fun getApplicationContext(): Context {

    return application.applicationContext

}



override fun unbindService(p0: ServiceConnection) {

    application.unbindService(p0)

}



override fun bindService(p0: Intent, p1: ServiceConnection, p2: Int): Boolean {

    return application.bindService(p0, p1, p2)

}



override fun onBeaconServiceConnect() {



    beaconManager!!.beaconParsers.clear()

    beaconManager!!.beaconParsers.add(AltBeaconParser())

    beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.URI_BEACON_LAYOUT))

    beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_TLM_LAYOUT))

    beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_UID_LAYOUT))

    beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_URL_LAYOUT))

    beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25"))

    beaconManager!!.backgroundMode = false



    beaconManager!!.addMonitorNotifier(object : MonitorNotifier {

        override fun didDetermineStateForRegion(p0: Int, p1: Region?) {

            Timber.d("FGBeacon: didDetermineStateForRegion INSIDE = ${p0 == MonitorNotifier.INSIDE}")

        }



        override fun didEnterRegion(p0: Region?) {

            Timber.d("FGBeacon: didEnterRegion")

        }



        override fun didExitRegion(p0: Region?) {

            Timber.d("FGBeacon: didExitRegion")

        }

    })

    beaconManager!!.addRangeNotifier { mutableCollection: MutableCollection<Beacon>, region: Region ->

        Timber.d("FGBeacon $mutableCollection")

    }

    beaconManager!!.startMonitoringBeaconsInRegion(Region(REGION_UID, null, null, null))

    beaconManager!!.startRangingBeaconsInRegion(Region(REGION_UID, null, null, null))

}



fun startScan() {

    beaconManager = BeaconManager.getInstanceForApplication(application)

    beaconManager!!.bind(this)

}



fun stopScan() {

    beaconManager?.unbind(this)

}

}

Background scan inside application class:

class MyApplication : Application(), BootstrapNotifier {



// Fields

private var beaconManager: BeaconManager? = null

private var backgroundPowerSaver: BackgroundPowerSaver ?= null

private var regionBootstrap : RegionBootstrap ?= null

private var foregroundService: BeaconForegroundService ?= null

val REGION_UID = "region_uid"



//Method for start background scan here



fun startScan() {

        beaconManager = BeaconManager.getInstanceForApplication(this)

        beaconManager!!.beaconParsers.clear()

        beaconManager!!.beaconParsers.add(AltBeaconParser())

        beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.URI_BEACON_LAYOUT))

        beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_TLM_LAYOUT))

        beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_UID_LAYOUT))

        beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout(BeaconParser.EDDYSTONE_URL_LAYOUT))

        beaconManager!!.beaconParsers.add(BeaconParser().setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25"))



        val notificationBuilder = Notification.Builder(this)

        notificationBuilder.setSmallIcon(R.drawable.ic_launcher_foreground)

        notificationBuilder.setContentTitle("Scanning for beacons")

        val intent = Intent(this, MainActivity::class.java)

        val pendingIntent = PendingIntent.getActivity(this, MainActivity.BEACON_REQUEST_CODE, intent, PendingIntent.FLAG_UPDATE_CURRENT)

        notificationBuilder.setContentIntent(pendingIntent)



        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

            val channel = NotificationChannel("MyChannelId", "NotyName", NotificationManager.IMPORTANCE_DEFAULT)

            channel.description = "NotyDesc"

            val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

            notificationManager.createNotificationChannel(channel)

            notificationBuilder.setChannelId(channel.id)

        }









        val region = Region(REGION_UID, null, null, null)



        beaconManager!!.enableForegroundServiceScanning(notificationBuilder.build(), 456)

        beaconManager!!.setEnableScheduledScanJobs(false)

        beaconManager!!.backgroundBetweenScanPeriod = 0

        beaconManager!!.backgroundScanPeriod = TimeUnit.SECONDS.toMillis(5)

        beaconManager!!.backgroundMode = true



        regionBootstrap  = RegionBootstrap(this, region)

        backgroundPowerSaver = BackgroundPowerSaver(this)



        beaconManager!!.addRangeNotifier { mutableCollection: MutableCollection<Beacon>, r: Region ->

            Timber.d("PBeacon $mutableCollection")

        }

    }



//Disable background scan if application start in foreground

fun disableMonitoring() {

        regionBootstrap?.disable()

        regionBootstrap = null

        beaconManager?.removeAllRangeNotifiers()

    }



  override fun didDetermineStateForRegion(p0: Int, p1: Region?) {

        Timber.d("PBeacon: StateForRegion INSIDE = ${p0 == MonitorNotifier.INSIDE}")

    }



//Start ranging if we inside region

    override fun didEnterRegion(p0: Region?) {

        Timber.d("PBeacon: I see a beacon first time")

        beaconManager!!.startRangingBeaconsInRegion(Region(REGION_UID, null, null, null))



    }



//Stop ranging if we move out from region

    override fun didExitRegion(p0: Region?) {

        Timber.d("PBeacon : I no longer see a beacon.")

        beaconManager!!.stopRangingBeaconsInRegion(Region(REGION_UID, null, null, null))

    }

And finally - registered listener for detect foreground/background app state changes (inside onCreate of application)

registerActivityLifecycleCallbacks(object : ActivityLifecycleCallbacks {



            //Stop background scan and start foreground

            override fun onActivityStarted(activity: Activity?) {

                disableMonitoring() 



                foregroundService = BeaconForegroundService(this@MyApplication)

                foregroundService!!.startScan()

            }



              //Stop foreground scan and start background

              override fun onActivityStopped(activity: Activity?) {

                foregroundService?.stopScan()

                foregroundService = null



                startScan()

            }



        })

Logs here:

Logs when application starting in foreground (looks fine)

D/BeaconParser: Parsing beacon layout: m:2-3=beac,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25

D/BeaconParser: Parsing beacon layout: m:2-3=beac,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25

D/BeaconParser: Parsing beacon layout: s:0-1=fed8,m:2-2=00,p:3-3:-41,i:4-21v

D/BeaconParser: Parsing beacon layout: x,s:0-1=feaa,m:2-2=20,d:3-3,d:4-5,d:6-7,d:8-11,d:12-15

D/BeaconParser: Parsing beacon layout: s:0-1=feaa,m:2-2=00,p:3-3:-41,i:4-13,i:14-19

D/BeaconParser: Parsing beacon layout: s:0-1=feaa,m:2-2=10,p:3-3:-41,i:4-21v

D/BeaconParser: Parsing beacon layout: m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25

....

BeaconForegroundService$onBeaconServiceConnect: [id1: b5b182c7-eab1-4988-aa99-b5c1517008d9 id2: 1 id3: 57197]

Close app (background mode?):

Processing pdu type FF: 0201061aff4c000215b5b182c7eab14988aa99b5c1517008d90001df6dc50d0961626561636f6e5f36444446000000000000000000000000000000000000 with startIndex: 5, endIndex: 29

D/BeaconParser: This is not a matching Beacon advertisement. Was expecting aa fe at offset 5 and 20 at offset 7.  The bytes I see are: 0201061aff4c000215b5b182c7eab14988aa99b5c1517008d90001df6dc50d0961626561636f6e5f36444446000000000000000000000000000000000000

 D/BeaconParser: Ignoring pdu type 01

...

 D/BeaconParser: Processing pdu type FF: 0201061aff4c000215b5b182c7eab14988aa99b5c1517008d90001df6dc50d0961626561636f6e5f36444446000000000000000000000000000000000000 with startIndex: 5, endIndex: 29

D/BeaconParser: This is a recognized beacon advertisement -- 02 15 seen

D/BeaconParser: Bytes are: 0201061aff4c000215b5b182c7eab14988aa99b5c1517008d90001df6dc50d0961626561636f6e5f36444446000000000000000000000000000000000000

D/ScanHelper: Beacon packet detected for: id1: b5b182c7-eab1-4988-aa99-b5c1517008d9 id2: 1 id3: 57197 with rssi -46

D/RangeState: adding id1: b5b182c7-eab1-4988-aa99-b5c1517008d9 id2: 1 id3: 57197 to existing range for: org.altbeacon.beacon.service.RangedBeacon@332c859

After reboot:

I/BeaconManager: BeaconManager started up on pid 7407 named 'com.myapp' for application package 'com.myapp'.  isMainProcess=true

D/BeaconParser: Parsing beacon layout: m:2-3=beac,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25

And that's all. No detections, waiting (20+ minutes)

Is it bug of library/device or i doing something wrong?

Can we use background scan without notification?

Whan we start application again (to foreground) notification refreshed. How can i avoid this?

Big thanks

android bluetooth-lowenergy ibeacon beacon altbeacon

asked Nov 22 at 16:34

Yuriy Aizenberg

161421

asked Nov 22 at 16:34

Yuriy Aizenberg

161421

asked Nov 22 at 16:34

Yuriy Aizenberg

161421

asked Nov 22 at 16:34

Yuriy Aizenberg

161421

asked Nov 22 at 16:34

Yuriy Aizenberg

161421

1

Try moving the startRanginfBeaconsInRegion() call inside the didDetermineStateForRegion method. After restart, the region state is persisted, so you will not get a new call to didEnterRegion if you were already inside when the app last was running. The didDetermineState callback is always made on restart so it is a good place to trigger starting ranging..
– davidgyoung
Nov 22 at 17:42

1

Also, make sure the startScan() call is triggered in the Application class' onCreate method, and verify by debug lines that it gets called.
– davidgyoung
Nov 23 at 0:04

1

If you are using Android 8+, make sure you have library version 2.15.2 or higher (the version shows up in the logs) otherwise starting a foreground service in the background won't work. See: github.com/AltBeacon/android-beacon-library/pull/746
– davidgyoung
Nov 23 at 0:23

@davidgyoung Thanks for the reply. Unfortunately, not working. Lib version - 2.15.2 onCreate of application not called. I move startRangingBeaconsInRegion inside didDetermineStateForRegion callback method, but after reboot still not started.
– Yuriy Aizenberg
Nov 23 at 15:22

@davidgyoung So i took code from example (github.com/AltBeacon/android-beacon-library-reference/blob/…) and now scanner work after reboot! But no beacons found :( I see that didDetermineStateForRegion always has first arg = 0, it's "OUTSIDE". D/BeaconService: Currently monitoring 1 regions. I/BeaconService: stop ranging received D/BeaconService: Currently ranging 0 regions.
– Yuriy Aizenberg
Nov 23 at 16:51

|
show 1 more comment

1

Try moving the startRanginfBeaconsInRegion() call inside the didDetermineStateForRegion method. After restart, the region state is persisted, so you will not get a new call to didEnterRegion if you were already inside when the app last was running. The didDetermineState callback is always made on restart so it is a good place to trigger starting ranging..
– davidgyoung
Nov 22 at 17:42

1

Also, make sure the startScan() call is triggered in the Application class' onCreate method, and verify by debug lines that it gets called.
– davidgyoung
Nov 23 at 0:04

1

If you are using Android 8+, make sure you have library version 2.15.2 or higher (the version shows up in the logs) otherwise starting a foreground service in the background won't work. See: github.com/AltBeacon/android-beacon-library/pull/746
– davidgyoung
Nov 23 at 0:23

@davidgyoung Thanks for the reply. Unfortunately, not working. Lib version - 2.15.2 onCreate of application not called. I move startRangingBeaconsInRegion inside didDetermineStateForRegion callback method, but after reboot still not started.
– Yuriy Aizenberg
Nov 23 at 15:22

@davidgyoung So i took code from example (github.com/AltBeacon/android-beacon-library-reference/blob/…) and now scanner work after reboot! But no beacons found :( I see that didDetermineStateForRegion always has first arg = 0, it's "OUTSIDE". D/BeaconService: Currently monitoring 1 regions. I/BeaconService: stop ranging received D/BeaconService: Currently ranging 0 regions.
– Yuriy Aizenberg
Nov 23 at 16:51

Try moving the startRanginfBeaconsInRegion() call inside the didDetermineStateForRegion method. After restart, the region state is persisted, so you will not get a new call to didEnterRegion if you were already inside when the app last was running. The didDetermineState callback is always made on restart so it is a good place to trigger starting ranging..
– davidgyoung
Nov 22 at 17:42

Also, make sure the startScan() call is triggered in the Application class' onCreate method, and verify by debug lines that it gets called.
– davidgyoung
Nov 23 at 0:04

If you are using Android 8+, make sure you have library version 2.15.2 or higher (the version shows up in the logs) otherwise starting a foreground service in the background won't work. See: github.com/AltBeacon/android-beacon-library/pull/746
– davidgyoung
Nov 23 at 0:23

@davidgyoung Thanks for the reply. Unfortunately, not working. Lib version - 2.15.2 onCreate of application not called. I move startRangingBeaconsInRegion inside didDetermineStateForRegion callback method, but after reboot still not started.
– Yuriy Aizenberg
Nov 23 at 15:22

@davidgyoung So i took code from example (github.com/AltBeacon/android-beacon-library-reference/blob/…) and now scanner work after reboot! But no beacons found :( I see that didDetermineStateForRegion always has first arg = 0, it's "OUTSIDE". D/BeaconService: Currently monitoring 1 regions. I/BeaconService: stop ranging received D/BeaconService: Currently ranging 0 regions.
– Yuriy Aizenberg
Nov 23 at 16:51

|
show 1 more comment

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