SetupNotification after updateBlePriority seems to fail.

Describe the bug I establish connection to a BLE device if I found appropriate GATT characteristic & I try to update connection priority with updateBlePriority.

And if I try to setup Notif on some characteristic, i got an error (see log). connection .setupNotification(readCharacteristicUUID)

D/Main: [main]BLE scan network : starting
D/BLECoapService: [main]QR code to validate : https://go2se.com/ref=EPG400L/sn=PPL20083000110
D/BLECoapService: [main]Identify : ref=EPG400L/sn=PPL20083000110
D/BLECoapService: [main]CRC16 : 0xe783
    [main]Checksum : 0x2c96
D/BLECoapService: [DefaultDispatcher-worker-1]Sending new BLE step : INIT
D/BLECoapService: [DefaultDispatcher-worker-1]QR code to validate : https://go2se.com/ref=EPG400L/sn=PPL20083000110
    [DefaultDispatcher-worker-1]Identify : ref=EPG400L/sn=PPL20083000110
    [DefaultDispatcher-worker-1]CRC16 : 0xe783
    [DefaultDispatcher-worker-1]Checksum : 0x2c96
D/Main: [main]BLE step received : INIT
D/BLECoapService: [DefaultDispatcher-worker-1]Setting BTP Fragment payload size to 179
D/RxBle#Log: Received new options (LogOptions{logLevel=null, macAddressLogSetting=null, uuidLogSetting=null, shouldLogAttributeValues=null, shouldLogScannedPeripherals=null, logger=com.polidea.rxandroidble2.internal.RxBleLog$2@ff8fd09}) and merged with old setup: LoggerSetup{logLevel=3, macAddressLogSetting=2147483647, uuidLogSetting=2147483647, shouldLogAttributeValues=false, shouldLogScannedPeripherals=true, logger=com.polidea.rxandroidble2.internal.RxBleLog$1@812ab0e}. New setup: LoggerSetup{logLevel=3, macAddressLogSetting=2147483647, uuidLogSetting=2147483647, shouldLogAttributeValues=false, shouldLogScannedPeripherals=true, logger=com.polidea.rxandroidble2.internal.RxBleLog$2@ff8fd09}
D/RxBle#Client: Received new options (LogOptions{logLevel=3, macAddressLogSetting=null, uuidLogSetting=null, shouldLogAttributeValues=null, shouldLogScannedPeripherals=null, logger=null}) and merged with old setup: LoggerSetup{logLevel=3, macAddressLogSetting=2147483647, uuidLogSetting=2147483647, shouldLogAttributeValues=false, shouldLogScannedPeripherals=true, logger=com.polidea.rxandroidble2.internal.RxBleLog$2@ff8fd09}. New setup: LoggerSetup{logLevel=3, macAddressLogSetting=2147483647, uuidLogSetting=2147483647, shouldLogAttributeValues=false, shouldLogScannedPeripherals=true, logger=com.polidea.rxandroidble2.internal.RxBleLog$2@ff8fd09}
D/BLECoapService: [DefaultDispatcher-worker-1]Sending new BLE step : SCANNING
D/Main: [main]BLE step received : SCANNING
D/RxBle#ClientOperationQueue: QUEUED   ScanOperationApi21(164279837)
D/RxBle#ClientOperationQueue: STARTED  ScanOperationApi21(164279837)
I/RxBle#ClientOperationQueue: RUNNING  ScanOperationApi21{}
I/RxBle#QueueOperation: Scan operation is requested to start.
D/RxBle#ScanOperationApi21: No library side filtering —> debug logs of scanned devices disabled
D/BluetoothAdapter: isLeEnabled(): ON
D/BluetoothLeScanner: onScannerRegistered() - status=0 scannerId=7 mScannerId=0
D/RxBle#ClientOperationQueue: FINISHED ScanOperationApi21(164279837) in 30 ms
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-44, timestampNanos=3824946457981, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-40, timestampNanos=3825882320834, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-39, timestampNanos=3826183576177, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-42, timestampNanos=3826403010678, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-41, timestampNanos=3826540074129, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-94, timestampNanos=3826548933921, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-36, timestampNanos=3826620406845, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-46, timestampNanos=3827142998876, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-40, timestampNanos=3827197521642, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-37, timestampNanos=3827456226095, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-44, timestampNanos=3827692606067, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-43, timestampNanos=3827930343069, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-42, timestampNanos=3828411712076, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-40, timestampNanos=3828546156673, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-39, timestampNanos=3829030671773, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-41, timestampNanos=3829090233758, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/zygote: Do full code cache collection, code=125KB, data=113KB
I/zygote: After code cache collection, code=119KB, data=73KB
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-41, timestampNanos=3829763728513, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-40, timestampNanos=3830112193235, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-40, timestampNanos=3830181794856, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-37, timestampNanos=3830988614989, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-47, timestampNanos=3831402831905, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-42, timestampNanos=3831900687163, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-39, timestampNanos=3831910114612, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-91, timestampNanos=3831911077581, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-92, timestampNanos=3831920368936, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-92, timestampNanos=3831942714823, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-92, timestampNanos=3831951248418, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-46, timestampNanos=3832516035297, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-54, timestampNanos=3832898562887, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-43, timestampNanos=3833256826308, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/zygote: Do partial code cache collection, code=120KB, data=77KB
I/zygote: After code cache collection, code=120KB, data=77KB
    Increasing code cache capacity to 512KB
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-39, timestampNanos=3833425506221, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-41, timestampNanos=3833958560545, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-39, timestampNanos=3834307444903, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-45, timestampNanos=3834327476363, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-40, timestampNanos=3834507386641, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-41, timestampNanos=3835088946699, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-93, timestampNanos=3835105539045, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-94, timestampNanos=3835137445610, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-39, timestampNanos=3835146772018, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-93, timestampNanos=3835148816393, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-41, timestampNanos=3835568474820, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-46, timestampNanos=3835764142860, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-46, timestampNanos=3836140265502, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-41, timestampNanos=3836401703393, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-92, timestampNanos=3836456522044, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-48, timestampNanos=3836977820637, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-43, timestampNanos=3837050056322, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-42, timestampNanos=3837641312526, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-37, timestampNanos=3838066600954, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-39, timestampNanos=3838411371770, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-40, timestampNanos=3838782170296, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-46, timestampNanos=3839310917537, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-39, timestampNanos=3839830253682, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-40, timestampNanos=3839876582645, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-45, timestampNanos=3840562504328, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-40, timestampNanos=3840606834124, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-38, timestampNanos=3841057727502, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-45, timestampNanos=3841504135151, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-40, timestampNanos=3841815962057, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-37, timestampNanos=3841873387688, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-38, timestampNanos=3842454771027, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-45, timestampNanos=3842913000031, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-38, timestampNanos=3843290910173, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=null}, rssi=-38, timestampNanos=3843603566089, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
I/RxBle#Client: ScanResult{bleDevice=RxBleDeviceImpl{MAC='XX:XX:XX:XX:XX:XX', name=EPG400L}, rssi=-53, timestampNanos=3843612783746, callbackType=CALLBACK_TYPE_ALL_MATCHES, scanRecord=[...]}
D/BLECoapService: [main]The BLE expected device has been found, scan stopped. Mac Address = B0:7E:11:ED:A5:C2
I/RxBle#CancellableDisposable: Scan operation is requested to stop.
D/BLECoapService: [main]BLE Scan device completed successfully !
    [main]Sending new BLE step : CONNECTING
D/BLECoapService: [main]Setting COAP Frame size to 2048
D/BluetoothAdapter: isLeEnabled(): ON
I/zygote: Thread[1,tid=14262,Native,Thread*=0xace5a000,peer=0x73aae9f0,"main"] recursive attempt to load library "/data/app/com.se.edm.edm_test_app-9O9sASDqal6hQGnuRJgGlA==/lib/arm/libsrfcoapclient.so"
D/btp: BTP device connection is RxBleConnectionState{DISCONNECTED}
D/-$$Lambda$CoAPBtpDeviceImpl$kg75qexbGXuKaXvXq4NHYvkPhpc: Device is in state RxBleConnectionState{DISCONNECTED}
D/btp: Try to establish BTP connection
D/btp: See if bonding is needed
    Bonding is not needed
D/Main: [main]BLE step received : CONNECTING
D/RxBle#ClientOperationQueue: QUEUED   ConnectOperation(98779055)
D/RxBle#ClientOperationQueue: STARTED  ConnectOperation(98779055)
I/RxBle#ClientOperationQueue: RUNNING  ConnectOperation{MAC='XX:XX:XX:XX:XX:XX', autoConnect=false}
D/BluetoothGatt: connect() - device: B0:7E:11:ED:A5:C2, auto: false
    registerApp()
D/BluetoothGatt: registerApp() - UUID=3ea513de-47d1-4de3-b7cf-39ca9b83c457
D/BluetoothGatt: onClientRegistered() - status=0 clientIf=7
D/BluetoothGatt: onClientConnectionState() - status=0 clientIf=7 device=B0:7E:11:ED:A5:C2
I/RxBle#GattCallback: MAC='XX:XX:XX:XX:XX:XX'  onConnectionStateChange(), status=0, value=2
D/RxBle#ClientOperationQueue: FINISHED ConnectOperation(98779055) in 2450 ms
D/RxBle#ConnectionOperationQueue: QUEUED   ServiceDiscoveryOperation(82452506)
D/RxBle#ConnectionOperationQueue: STARTED  ServiceDiscoveryOperation(82452506)
I/RxBle#ConnectionOperationQueue: RUNNING  ServiceDiscoveryOperation{MAC='XX:XX:XX:XX:XX:XX'}
D/BluetoothGatt: discoverServices() - device: B0:7E:11:ED:A5:C2
D/BluetoothGatt: onSearchComplete() = Device=B0:7E:11:ED:A5:C2 Status=0
I/RxBle#GattCallback: MAC='XX:XX:XX:XX:XX:XX'     onServicesDiscovered(), status=0
D/btp: Btp Ble primary GATT service find
D/btp: Btp Read characteristic find
    Btp Write characteristic find
D/RxBle#ConnectionOperationQueue: QUEUED   ConnectionPriorityChangeOperation(232361286)
D/RxBle#ConnectionOperationQueue: FINISHED ServiceDiscoveryOperation(82452506) in 25 ms
D/RxBle#ConnectionOperationQueue: STARTED  ConnectionPriorityChangeOperation(232361286)
I/RxBle#ConnectionOperationQueue: RUNNING  ConnectionPriorityChangeOperation{MAC='XX:XX:XX:XX:XX:XX', connectionPriority=CONNECTION_PRIORITY_HIGH, successTimeout={value=1, timeUnit=SECONDS}}
D/BluetoothGatt: requestConnectionPriority() - params: 1
D/BluetoothGatt: onConnectionUpdated() - Device=B0:7E:11:ED:A5:C2 interval=12 latency=0 timeout=500 status=0
I/RxBle#GattCallback: MAC='XX:XX:XX:XX:XX:XX'      onConnectionUpdated(), status=0, interval=12 (15,00 ms), latency=0, timeout=500 (5000 ms)
D/BluetoothGatt: onConnectionUpdated() - Device=B0:7E:11:ED:A5:C2 interval=12 latency=0 timeout=2000 status=0
I/RxBle#GattCallback: MAC='XX:XX:XX:XX:XX:XX'      onConnectionUpdated(), status=0, interval=12 (15,00 ms), latency=0, timeout=2000 (20000 ms)
D/coap.btp: CoAP endpoint succeed with BTP Connection
D/RxBle#ConnectionOperationQueue: FINISHED ConnectionPriorityChangeOperation(232361286) in 1009 ms
D/RxBle#ConnectionOperationQueue: QUEUED   DescriptorWriteOperation(43105525)
D/RxBle#ConnectionOperationQueue: STARTED  DescriptorWriteOperation(43105525)
I/RxBle#ConnectionOperationQueue: RUNNING  DescriptorWriteOperation{MAC='XX:XX:XX:XX:XX:XX', descriptor=[uuid='...', hexValue=[...]]}
I/RxBle#GattCallback: MAC='XX:XX:XX:XX:XX:XX'        onDescriptorWrite(), status=1, value=[uuid='...']
D/RxBle#ConnectionOperationQueue: FINISHED DescriptorWriteOperation(43105525) in 42 ms
D/BluetoothGatt: setCharacteristicNotification() - uuid: a0000601-0451-4000-b000-000000000001 enable: false
D/RxBle#ConnectionOperationQueue: QUEUED   DescriptorWriteOperation(29531232)
D/RxBle#ConnectionOperationQueue: STARTED  DescriptorWriteOperation(29531232)
I/RxBle#ConnectionOperationQueue: RUNNING  DescriptorWriteOperation{MAC='XX:XX:XX:XX:XX:XX', descriptor=[uuid='...', hexValue=[...]]}
E/coap.btp: Failure in read BTP stream due to unexpected exception
    com.polidea.rxandroidble2.exceptions.BleCannotSetCharacteristicNotificationException: Cannot write client characteristic config descriptor (code 3) with characteristic UUID a0000601-0451-4000-b000-000000000001
        at com.polidea.rxandroidble2.internal.connection.NotificationAndIndicationManager$7.apply(NotificationAndIndicationManager.java:241)
        at com.polidea.rxandroidble2.internal.connection.NotificationAndIndicationManager$7.apply(NotificationAndIndicationManager.java:238)
        at io.reactivex.internal.operators.completable.CompletableResumeNext$ResumeNextObserver.onError(CompletableResumeNext.java:82)
        at io.reactivex.internal.operators.observable.ObservableIgnoreElementsCompletable$IgnoreObservable.onError(ObservableIgnoreElementsCompletable.java:61)
        at io.reactivex.internal.operators.observable.ObservableCreate$CreateEmitter.tryOnError(ObservableCreate.java:84)
        at com.polidea.rxandroidble2.internal.serialization.FIFORunnableEntry$1$1.onError(FIFORunnableEntry.java:73)
        at io.reactivex.internal.operators.observable.ObservableUnsubscribeOn$UnsubscribeObserver.onError(ObservableUnsubscribeOn.java:70)
        at io.reactivex.internal.operators.observable.ObservableCreate$CreateEmitter.tryOnError(ObservableCreate.java:84)
        at com.polidea.rxandroidble2.internal.util.QueueReleasingEmitterWrapper.onError(QueueReleasingEmitterWrapper.java:45)
        at io.reactivex.internal.observers.DeferredScalarDisposable.error(DeferredScalarDisposable.java:100)
        at io.reactivex.internal.operators.single.SingleToObservable$SingleToObservableObserver.onError(SingleToObservable.java:77)
        at io.reactivex.internal.operators.single.SingleTimeout$TimeoutMainObserver.onError(SingleTimeout.java:150)
        at io.reactivex.internal.operators.single.SingleMap$MapSingleObserver.onError(SingleMap.java:69)
        at io.reactivex.internal.operators.observable.ObservableElementAtSingle$ElementAtObserver.onError(ObservableElementAtSingle.java:102)
        at io.reactivex.internal.observers.BasicFuseableObserver.onError(BasicFuseableObserver.java:100)
        at io.reactivex.observers.SerializedObserver.onError(SerializedObserver.java:153)
        at io.reactivex.internal.operators.observable.ObservableDelay$DelayObserver$OnError.run(ObservableDelay.java:128)
        at io.reactivex.internal.schedulers.ScheduledRunnable.run(ScheduledRunnable.java:66)
        at io.reactivex.internal.schedulers.ScheduledRunnable.call(ScheduledRunnable.java:57)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:301)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
        at java.lang.Thread.run(Thread.java:764)
     Caused by: com.polidea.rxandroidble2.exceptions.BleGattDescriptorException: GATT exception from MAC='XX:XX:XX:XX:XX:XX', status 1 (GATT_INVALID_HANDLE), type BleGattOperation{description='DESCRIPTOR_WRITE'}. (Look up status 0x01 here https://android.googlesource.com/platform/external/bluetooth/bluedroid/+/android-5.1.0_r1/stack/include/gatt_api.h)
        at com.polidea.rxandroidble2.internal.connection.RxBleGattCallback.propagateErrorIfOccurred(RxBleGattCallback.java:259)
        at com.polidea.rxandroidble2.internal.connection.RxBleGattCallback$2.onDescriptorWrite(RxBleGattCallback.java:174)
        at android.bluetooth.BluetoothGatt$1$10.run(BluetoothGatt.java:538)
        at android.bluetooth.BluetoothGatt.runOrQueueCallback(BluetoothGatt.java:725)
        at android.bluetooth.BluetoothGatt.-wrap0(Unknown Source:0)
        at android.bluetooth.BluetoothGatt$1.onDescriptorWrite(BluetoothGatt.java:533)
        at android.bluetooth.IBluetoothGattCallback$Stub.onTransact(IBluetoothGattCallback.java:172)
        at android.os.Binder.execTransact(Binder.java:697)
I/RxBle#GattCallback: MAC='XX:XX:XX:XX:XX:XX'        onDescriptorWrite(), status=1, value=[uuid='...']

Additional context Add any other context about the problem here.

[aygalinc]

After changing my fragmentation layer that sends an extra empty I cannot reproduce it. So maybe it was located on edge device side. Thx for the quick answer.

[aygalinc]

A moto G5 & android 8.1