Scanning and getDiscoveredPeripherals not working

[Balajisivakumar92]

7.3.1 Version

Tell us which versions you are using:

• react-native-ble-manager 7.3.1
• react-native "0.62.2"
• Android 10

###Expected behaviour

Scanning and getDiscoveredPeripherals, have to give available nearby devices. It was working well in debug mode.

###Actual behaviour

Scanning and getDiscoveredPeripherals, It not working now, After Generating the release APK and now its not working for debug mode also.

[kiafaldorius]

Restart your phone to see if it's working again. I've seen cases where Android's bluetooth subsystem just randomly stops servicing or returning data.

[anwarhamr]

I too am seeing this issue. I saw the other issue w/ the necessary change to ACCESS_FINE_LOCATION and have made that change.

Had version of ble 7.1.3 was working yesterday Today, upgraded to android 10 on tablet that the app was running on and working just fine for months. Restarted app, restarted tablet, reset network settings (reset bluetooth settings) Still nothing. Upgraded to ble 7.3.1 rebooted, reinstalled and still not working Tablet is Samsung Galaxy Tab S5e

Debugging:

• Deleted android build folders, rebuilt, reinstalled many times.

• I see that ble starts.

• I get response from scan but devices are never discovered.

• I see the devices if I use the bt system app but the my app does not get the discovered device message.

• I have another tablet that is android 6 which will be our production device. Same code works just fine.

What else can I try?

Code: BleManager.scan([oneItem], 5, false, { numberOfMatches: 3, matchMode: 1, scanMode: 2, })

[kiafaldorius]

Try:

BleManager.scan([], 15, false, {
  numberOfMatches: 3,
  matchMode: 1,
  scanMode: 2,
  reportDelay: 0
})

[anwarhamr]

Try:

BleManager.scan([], 15, false, {
  numberOfMatches: 3,
  matchMode: 1,
  scanMode: 2,
  reportDelay: 0
})

Didn't help, thanks for the idea.

[anwarhamr]

I've tried to capture the scan via Logcat here is the results. The only thing that is suspiciuos to me is the bolded line toward the bottom but I'm not sure...

08-17 17:57:54.963 25441 25512 D ReactNativeBleManager: scan 08-17 17:57:54.965 25441 25512 D ReactNativeBleManager: Filter service: 48BBE7D5-81E5-46A4-B3AD-23417934D96D 08-17 17:57:54.965 25441 25512 D BluetoothAdapter: STATE_ON 08-17 17:57:54.966 25441 25512 I chatty : uid=10262(com.epitel.remi_tablet) mqt_native_modu identical 1 line 08-17 17:57:54.966 25441 25512 D BluetoothAdapter: STATE_ON 08-17 17:57:54.968 25441 25512 D BluetoothAdapter: BLE support array set: 010011 08-17 17:57:54.968 25441 25512 D BluetoothLeScanner: Start Scan with callback 08-17 17:57:54.969 16868 16950 D BtGatt.ContextMap: add() - appUid: 10262, appPid: 25441, appName: com.epitel.remi_tablet 08-17 17:57:54.969 16868 16957 I bt_stack: [INFO:gatt_api.cc(953)] GATT_Register c9b0602a-d9ac-433e-8ade-795c9f247c03 08-17 17:57:54.970 16868 16957 I bt_stack: [INFO:gatt_api.cc(990)] allocated gatt_if=9 08-17 17:57:54.971 25441 25460 D BluetoothLeScanner: onScannerRegistered() - status=0 scannerId=9 mScannerId=0 08-17 17:57:54.971 16868 16950 D BluetoothAdapter: STATE_ON 08-17 17:57:54.972 16868 16950 E BluetoothUtils: Permission denial: Location is off. 08-17 17:57:54.975 16868 16915 D BluetoothAdapter: STATE_ON 08-17 17:57:54.978 25441 25511 I ReactNativeJS: '%c Dispatching ', 'background: #222; color: #bada55', { type: 'BLE_SCAN_STARTED', 08-17 17:57:54.978 25441 25511 I ReactNativeJS: bondedPeripherals: [], 08-17 17:57:54.978 25441 25511 I ReactNativeJS: discoveredPeripherals: [], 08-17 17:57:54.978 25441 25511 I ReactNativeJS: utc: 1597708674977 } 08-17 17:57:54.980 16868 16916 E BtGatt.GattService: [GSIM LOG]: gsimLogHandler, msg: MESSAGE_SCAN_START, appName: com.epitel.remi_tablet, scannerId: 9, reportDelayMillis=0 08-17 17:57:54.980 16868 16915 D BluetoothAdapter: STATE_ON 08-17 17:57:54.981 16868 16915 D BluetoothAdapter: STATE_ON 08-17 17:57:54.982 695 695 D [email protected]_handler: SerialClockVote: vote for UART CLK ON 08-17 17:57:54.984 695 695 D [email protected]_lock: Acquire wakelock is acquired 08-17 17:57:54.984 695 695 I [email protected]_handler: DeviceWakeUp: Writing IBS_WAKE_IND 08-17 17:57:54.987 695 16955 I [email protected]_handler: ProcessIbsCmd: Received IBS_WAKE_ACK: 0xFC 08-17 17:57:54.988 695 16955 I [email protected]_handler: ProcessIbsCmd: Received IBS_WAKE_IND: 0xFD 08-17 17:57:54.988 695 16955 I [email protected]_handler: ProcessIbsCmd: Writing IBS_WAKE_ACK 08-17 17:57:54.990 16868 16915 D BtGatt.ScanManager: configureFilterParamter() : onFoundTimeout | onLostTimeout | onFoundCount | numOfTrackingEntries | scanFilterRssiThreshold | trackableScanFilterRssiThreshold | matchMode 08-17 17:57:54.990 16868 16915 D BtGatt.ScanManager: configureFilterParamter() : 500|______10000|_________1|0|-128|________________________-128__|_______1 08-17 17:57:54.993 16868 16915 D BtGatt.ScanManager: configureRegularScanParams() scan param set to 6553 / 6553 (units) 08-17 17:57:54.993 16868 16957 W bt_btm : btm_ble_disable_resolving_list() rl_state = 0x0, rl_mask = 0x2, to_resume = 1 08-17 17:57:54.993 16868 16957 W bt_btm : btm_ble_disable_resolving_list() rl_state = 0x0, rl_mask = 0x2, to_resume = 1 08-17 17:57:55.003 25441 25511 I ReactNativeJS: '%c Action with type "BLE_SCAN_STARTED" took 24.00 milliseconds.', 'background: #bada55; color: #222' 08-17 17:57:55.012 25441 25511 I ReactNativeJS: '%c Dispatching ', 'background: #222; color: #bada55', { type: 'BLE_SCAN_REQ_CMPLT', 08-17 17:57:55.012 25441 25511 I ReactNativeJS: value: 'BLE_STATE_UPDATED', 08-17 17:57:55.012 25441 25511 I ReactNativeJS: location: 'BLE_STATE_UPDATED', 08-17 17:57:55.012 25441 25511 I ReactNativeJS: scanningForServices: [ '48BBE7D5-81E5-46A4-B3AD-23417934D96D' ], 08-17 17:57:55.012 25441 25511 I ReactNativeJS: utc: 1597708675011 } 08-17 17:57:55.012 25441 25511 I ReactNativeJS: '%c Action with type "BLE_SCAN_REQ_CMPLT" took 0.00 milliseconds.', 'background: #bada55; color: #222' 08-17 17:57:55.037 695 16955 I [email protected]_handler: ProcessIbsCmd: Received IBS_SLEEP_IND: 0xFE 08-17 17:57:55.316 1339 25541 D WifiConnectivityMonitor.DnsPingerHandler: setCurrentLinkProperties: lp={InterfaceName: wlan0 LinkAddresses: [ fe80::d845:c5ff:feee:cf5a/64,192.168.0.197/16,2605:a601:a982:c400:d845:c5ff:feee:cf5a/64,2605:a601:a982:c400:856f:9754:b7ae:2c61/64 ] DnsAddresses: [ /fe80::f6f5:e8ff:fe6e:dd82%wlan0,/192.168.1.1 ] Domains: null MTU: 0 TcpBufferSizes: 524288,1048576,4194304,524288,1048576,4194304 Routes: [ fe80::/64 -> :: wlan0,::/0 -> fe80::f6f5:e8ff:fe6e:dd82 wlan0,2605:a601:a982:c400::/64 -> :: wlan0,192.168.0.0/16 -> 0.0.0.0 wlan0,0.0.0.0/0 -> 192.168.1.1 wlan0 ]} 08-17 17:57:55.630 1339 25542 D WifiConnectivityMonitor.DnsThread: [|210] [] 08-17 17:57:55.632 1339 1717 D WifiConnectivityMonitor: DNS resultType : 0, responseTime : 210 08-17 17:57:55.633 1339 1716 D WifiConnectivityMonitor: updateBssidLatestDnsResultType - result: 0 08-17 17:57:55.807 695 16955 I [email protected]_handler: ProcessIbsCmd: Received IBS_WAKE_IND: 0xFD 08-17 17:57:55.807 695 16955 I [email protected]_handler: ProcessIbsCmd: Writing IBS_WAKE_ACK 08-17 17:57:55.815 16868 16901 D BluetoothUtils: getBtEnabledContainers(): btContainers = [] 08-17 17:57:55.815 16868 16901 E BluetoothRemoteDevices: Remote class is UNCATEGORIZED 08-17 17:57:55.815 1778 2079 V BluetoothEventManager: onReceive :: android.bluetooth.device.action.NAME_CHANGED 08-17 17:57:55.848 695 16955 I [email protected]_handler: ProcessIbsCmd: Received IBS_SLEEP_IND: 0xFE 08-17 17:57:55.930 504 504 I hwservicemanager: getTransport: Cannot find entry [email protected]::ISehChannel/imsd in either framework or device manifest. 08-17 17:57:55.997 695 16960 I [email protected]_handler: DeviceSleep: TX Awake, Sending SLEEP_IND 08-17 17:57:55.997 695 16960 D [email protected]_handler: SerialClockVote: vote for UART CLK OFF 08-17 17:57:56.147 695 16928 D [email protected]_lock: Release wakelock is released

[kiafaldorius]

08-17 17:57:54.972 16868 16950 E BluetoothUtils: Permission denial: Location is off.

Well, there's your problem. Location services are off on that phone or you don't have permission.

[anwarhamr]

Something is changing it then, this works i just run out of clients at some point.?.?

[kiafaldorius]

run out of clients at some point

I don't know what you mean by that. Basic process is to double check the AndroidManifest.xml, here are the Bluetooth permissions I have in mine on my react-native 0.61.5 app:

    <uses-permission android:name="android.permission.BLUETOOTH"/>
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

On one of my apps on react-native 0.62.2, I don't have any bluetooth uses-permission entries and it appears to still work...

Then check for location permissions in the settings:

Settings -> Location

Use location switcher at the top should be enabled.

Then tap App Permission, make sure your app is in one of the first two lists. (Allowed all the time or Allowed only while in use)

PS. Your scan also seems to be scanning for a particular service, did you run my code above exactly as is or did you add in that service id filter also?

Try removing that filter and running scan without that service id. And if scanning returns results, you can try using the lower case version of the service uuid, aka 48bbe7d5-81e5-46a4-b3ad-23417934d96d.

Also good to check that the service uuid is correct.

[anwarhamr]

ACCESS_COARSE_LOCATION is not necessary if you have ACCESS_FINE_LOCATION since Fine is a higher level of permission... But I have tried with both and only left in FINE.

ahh but... let me try the lower-case thing for the service id. I remember having to change it to uppercase in a previous release or to make it work for IOS... something like that. I'll try w/o and w/lowercase and update @kiafaldorius thanks for your thoughts and help.

[skicson]

I was also seeing this issue, but only with Android 10 (29). I ran the example code without problem (after adding ACCESS_FINE_LOCATION to the manifest and android:usesCleartextTraffic="true" to the <application tag). However, once I upgraded the targetSdkVersion to 29, it stopped working. According to an answer in this stack overflow post, the problem is that ACCESS_BACKGROUND_LOCATION needs to be set. Once I set that, and then changed my permissions to use "all the time" then it worked again. I'm not sure if this could be alternatively solved by this package using a foreground service as described in the post.

[Brianop]

@skicson Your answer worked, thanks.

Edit: Found a solution that doesn't require background permission. https://github.com/Polidea/react-native-ble-plx/issues/730#issuecomment-681946908

[anwarhamr]

@HKSOLDIER you wire-up to the event listener. Here is snippets of mine:

import {NativeEventEmitter, NativeModules, Platform, PermissionsAndroid} from 'react-native';
const BleManagerModule = NativeModules.BleManager;
const bleManagerEmitter = new NativeEventEmitter(BleManagerModule); //https://github.com/facebook/react-native/blob/235b16d93287061a09c4624e612b5dc4f960ce47/Libraries/vendor/emitter/EventEmitter.js


this.handlerDiscover = bleManagerEmitter.addListener('BleManagerDiscoverPeripheral', (d) => {
           ...
        });
        this.handlerStop = bleManagerEmitter.addListener('BleManagerStopScan', () => {
          ...
        });
        this.handlerDisconnect = bleManagerEmitter.addListener('BleManagerDisconnectPeripheral', (data) => {
           ...
        });
        this.handlerUpdate = bleManagerEmitter.addListener(
            'BleManagerDidUpdateValueForCharacteristic',
            (data) => {
                ...
            },
        );
        this.handlerUpdateState = bleManagerEmitter.addListener('BleManagerDidUpdateState', async (onOff) => {
           if (onOff == 'off') {
                _this.bleActive = _this.started == false;
                _this.scanning = null;
            } else _this.bleActive = _this.started == true;

          ...
        });

[hongweiCui]

For RN Application Debug Mode You must enable settings->location rights for the debugging APP manually in your phone's setting panel.

[josethz00]

I solved this issue by doing some configurations on my code.

At the BLE Start module, I changed to this:

-BLE.start({showAlert: true}).then(() => {
+BLE.start({showAlert: true, forceLegacy: true}).then(() => {
  console.log('Módulo inicializado');
})

At AndroidManifest.xml I just updated the maxSdkVersion property to 33 (Android 13+)

    <uses-permission android:name="android.permission.BLUETOOTH" android:maxSdkVersion="33" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" android:maxSdkVersion="33" />

    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" android:maxSdkVersion="33"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" android:maxSdkVersion="33"/>
    <uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />

And at android/build.gradle, I changed compileSdkVersion and targetSdkVersion to 33:

compileSdkVersion = 33
targetSdkVersion = 33