After few minutes the app does not find any beacon.

[bkhayargoli]

I am ranging beacons and it ranges fine, I get the beacon information like:

[Beacon{id: BeaconId{proximityUUID: 01020304-0506-0708-090A-0B0C0D0E0F10, majorId: 256, minorId: 1}, macAddress: 38:CD:CD:9E:03:BC, proximity: Proximity.near, rssi: -44, txPower: -60, accuracy: 0.07879706709651121}]

Yet after some time of running the app, ( the phone is locked and the app is in background but not killed) for like 5 to 10 minutes, I get the following error and they no beacons are detected.

I am running it on android 10, ONEPLUS A5010 device.

I/flutter ( 7686): [Beacon{id: BeaconId{proximityUUID: 01020304-0506-0708-090A-0B0C0D0E0F10, majorId: 256, minorId: 1}, macAddress: 38:CD:CD:9E:03:BC, proximity: Proximity.near, rssi: -44, txPower: -60, accuracy: 0.07879706709651121}]
I/ScanJob ( 7686): Scan job runtime expired: org.altbeacon.beacon.service.ScanJob@e92eb0a
3
D/BluetoothAdapter( 7686): isLeEnabled(): ON
D/BluetoothLeScanner( 7686): could not find callback wrapper
I/flutter ( 7686): [Beacon{id: BeaconId{proximityUUID: 01020304-0506-0708-090A-0B0C0D0E0F10, majorId: 256, minorId: 1}, macAddress: 38:CD:CD:9E:03:BC, proximity: Proximity.near, rssi: -44, txPower: -60, accuracy: 0.07544612653512178}]
I/ScanJob ( 7686): Using immediateScanJobId from manifest: 208352939
I/ScanJob ( 7686): Using periodicScanJobId from manifest: 208352940
W/JobInfo ( 7686): Requested interval +5m0s0ms for job 208352940 is too small; raising to +15m0s0ms
W/JobInfo ( 7686): Requested flex 0 for job 208352940 is too small; raising to +5m0s0ms
I/ScanJob ( 7686): ScanJob Lifecycle START: org.altbeacon.beacon.service.ScanJob@3665653
D/ScanHelper( 7686): BeaconParsers set to  count: 1
D/ScanHelper( 7686): First parser layout: m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24
I/CycledLeScanner( 7686): Using Android O scanner
I/ScanJob ( 7686): Using immediateScanJobId from manifest: 208352939
I/ScanJob ( 7686): Running immediate scan job: instance is org.altbeacon.beacon.service.ScanJob@3665653
I/ScanJob ( 7686): scanJob version 2.19.5 is starting up on the main process
2
W/ModelSpecificDistanceCalculator( 7686): Cannot find match for this device.  Using default
D/BluetoothAdapter( 7686): isLeEnabled(): ON
I/ScanJob ( 7686): Scan job running for 300000 millis
D/BluetoothAdapter( 7686): isLeEnabled(): ON
D/BluetoothLeScanner( 7686): onScannerRegistered() - status=0 scannerId=5 mScannerId=0
I/flutter ( 7686): No beacons around.
W/DistanceConfigFetcher( 7686): error reading beacon data
W/DistanceConfigFetcher( 7686): java.io.FileNotFoundException: https://s3.amazonaws.com/android-beacon-library/android-distance.json
W/DistanceConfigFetcher( 7686): 	at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:255)
W/DistanceConfigFetcher( 7686): 	at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.getInputStream(DelegatingHttpsURLConnection.java:211)
W/DistanceConfigFetcher( 7686): 	at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:30)
W/DistanceConfigFetcher( 7686): 	at org.altbeacon.beacon.distance.DistanceConfigFetcher.request(DistanceConfigFetcher.java:94)
W/DistanceConfigFetcher( 7686): 	at org.altbeacon.beacon.distance.ModelSpecificDistanceUpdater.doInBackground(ModelSpecificDistanceUpdater.java:28)
W/DistanceConfigFetcher( 7686): 	at org.altbeacon.beacon.distance.ModelSpecificDistanceUpdater.doInBackground(ModelSpecificDistanceUpdater.java:16)
W/DistanceConfigFetcher( 7686): 	at android.os.AsyncTask$3.call(AsyncTask.java:378)
W/DistanceConfigFetcher( 7686): 	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
W/DistanceConfigFetcher( 7686): 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
W/DistanceConfigFetcher( 7686): 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
W/DistanceConfigFetcher( 7686): 	at java.lang.Thread.run(Thread.java:919)
W/ModelSpecificDistanceCalculator( 7686): Cannot updated distance models from online database at java.io.FileNotFoundException: https://s3.amazonaws.com/android-beacon-library/android-distance.json
4
I/flutter ( 7686): No beacons around.

After that I unlock my phone and see the app scans again and beacon is found:

I/flutter ( 7686): No beacons around.
D/DecorView( 7686): onWindowFocusChangedFromViewRoot hasFocus: true, DecorView@59749e1[MainActivity]
D/ViewRootImpl[MainActivity]( 7686): windowFocusChanged hasFocus=true inTouchMode=true

I/flutter ( 7686): No beacons around.
D/BluetoothAdapter( 7686): isLeEnabled(): ON
I/flutter ( 7686): No beacons around.
D/BluetoothAdapter( 7686): isLeEnabled(): ON
D/BluetoothLeScanner( 7686): onScannerRegistered() - status=0 scannerId=5 mScannerId=0
I/ScanHelper( 7686): Non-distinct packets detected in a single scan.  Restarting scans unecessary.
I/flutter ( 7686): [Beacon{id: BeaconId{proximityUUID: 01020304-0506-0708-090A-0B0C0D0E0F10, majorId: 256, minorId: 1}, macAddress: 38:CD:CD:9E:03:BC, proximity: Proximity.near, rssi: -50, txPower: -60, accuracy: 0.15620210261951809}]

[PlayCulture]

Unfortunately this is probably due to Android killing background processes, rather than anything to do with this specific library