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System stops collecting data from and connecting to devices after running for many hours.

See original GitHub issue

Version

react-native-ble-manager v7.1.4
react-native v061.5
iOS/Android v.6 & v.9

Expected behaviour

Remains connected and collecting data. Other issues that seem similar #252

Actual behaviour

On an Android 6 medical grade device made by advantech. I connect to 4, bonded devices, I have a 2 notification characteristics setup one of which gets data every ~6 seconds. This all works fine for a while, like hours, then slowly devices disconnect and scanning for devices that are advertising do not get picked up.
I see a couple things in the logs that are pointing to running out of BluetoothGATT instances, as described here. There are only 32 BluetoothGATT objects available for the system from what I’m reading/understanding. Something seems to be holding onto these or something else that I can’t fathom. The code does not appear to be doing this in RN-ble-mgr but I’m not a Java programmer; perhaps the library we’re using? I have a counter for when devices connect/disconnect and it’s not happening so it may not have anything to do with those two actions.

I see these messages

03-12 09:04:53.515 13449 13484 D BluetoothAdapter: STATE_ON
03-12 09:04:53.518  7079  7092 D BtGatt.GattService: registerClient() - UUID=28ff312c-ec14-4f97-a90f-eb46fdb34265
03-12 09:04:53.518  7079  7106 E bt_btif : Register with GATT stack failed.
03-12 09:04:53.518  7079  7106 E bt_btif : Register with GATT stack failed.
03-12 09:04:53.518  7079  7098 D BtGatt.GattService: onClientRegistered() - UUID=28ff312c-ec14-4f97-a90f-eb46fdb34265, clientIf=0
03-12 09:04:53.518 13449 13463 D BluetoothLeScanner: onClientRegistered() - status=133 clientIf=0

and

03-13 14:11:16.805  8509  8509 D BluetoothLeScanner: could not find callback wrapper
03-13 14:11:16.807  8509  8543 D ReactNativeJS: BleManagerStopScan 
03-13 14:11:16.852  8509  8543 I ReactNativeJS: active session
03-13 14:11:17.466  2696  3018 D EVENT_THREAD: void CEventThread::run() POLLIN event on Fd (1)
03-13 14:11:17.466  2696  3018 D EVENT_THREAD: void CEventThread::run() Do poll with timeout: -1
03-13 14:11:17.466  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=3 connected=0 conn_id=259 reason=0x0008
03-13 14:11:17.466  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=4 connected=0 conn_id=260 reason=0x0008
03-13 14:11:17.466  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=5 connected=0 conn_id=261 reason=0x0008
03-13 14:11:17.466  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=6 connected=0 conn_id=262 reason=0x0008
03-13 14:11:17.466  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=7 connected=0 conn_id=263 reason=0x0008
03-13 14:11:17.467  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=8 connected=0 conn_id=264 reason=0x0008
03-13 14:11:17.467  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=9 connected=0 conn_id=265 reason=0x0008
03-13 14:11:17.467  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=10 connected=0 conn_id=266 reason=0x0008
03-13 14:11:17.467  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=11 connected=0 conn_id=267 reason=0x0008
03-13 14:11:17.467  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=12 connected=0 conn_id=268 reason=0x0008
03-13 14:11:17.467  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=13 connected=0 conn_id=269 reason=0x0008
03-13 14:11:17.467  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=14 connected=0 conn_id=270 reason=0x0008
03-13 14:11:17.467  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=15 connected=0 conn_id=271 reason=0x0008
03-13 14:11:17.467  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=16 connected=0 conn_id=272 reason=0x0008
03-13 14:11:17.467  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=17 connected=0 conn_id=273 reason=0x0008
03-13 14:11:17.467  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=18 connected=0 conn_id=274 reason=0x0008
03-13 14:11:17.467  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=19 connected=0 conn_id=275 reason=0x0008
03-13 14:11:17.467  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=20 connected=0 conn_id=276 reason=0x0008
03-13 14:11:17.467  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=21 connected=0 conn_id=277 reason=0x0008
03-13 14:11:17.467  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=22 connected=0 conn_id=278 reason=0x0008
03-13 14:11:17.467  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=23 connected=0 conn_id=279 reason=0x0008
03-13 14:11:17.467  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=24 connected=0 conn_id=280 reason=0x0008
03-13 14:11:17.467  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=25 connected=0 conn_id=281 reason=0x0008
03-13 14:11:17.468  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=26 connected=0 conn_id=282 reason=0x0008
03-13 14:11:17.468  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=27 connected=0 conn_id=283 reason=0x0008
03-13 14:11:17.468  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=28 connected=0 conn_id=284 reason=0x0008
03-13 14:11:17.468  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=29 connected=0 conn_id=285 reason=0x0008
03-13 14:11:17.468  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=30 connected=0 conn_id=286 reason=0x0008
03-13 14:11:17.468  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=31 connected=0 conn_id=287 reason=0x0008
03-13 14:11:17.468  3927  4077 W bt_btif : bta_gattc_conn_cback() - cif=32 connected=0 conn_id=288 reason=0x0008
03-13 14:11:17.468  3927  4077 I bt_btm_sec: btm_sec_disconnected clearing pending flag handle:65 reason:8
03-13 14:11:17.469  3927  3985 D BtGatt.GattService: onDisconnected() - clientIf=8, connId=264, address=80:EA:CA:70:01:0A
03-13 14:11:17.469  8509  8601 D BluetoothGatt: onClientConnectionState() - status=8 clientIf=8 device=80:EA:CA:70:01:0A
03-13 14:11:17.470  8509  8601 D ReactNativeBleManager: onConnectionStateChange to 0 on peripheral: 80:EA:CA:70:01:0A with status 8
03-13 14:11:17.470  8509  8601 D BluetoothGatt: cancelOpen() - device: 80:EA:CA:70:01:0A
03-13 14:11:17.473  3927  5420 D BtGatt.GattService: clientDisconnect() - address=80:EA:CA:70:01:0A, connId=null
03-13 14:11:17.473  3927  3985 E BluetoothRemoteDevices: state12newState1
03-13 14:11:17.473  8509  8601 D BluetoothGatt: close()
03-13 14:11:17.473  8509  8601 D BluetoothGatt: unregisterApp() - mClientIf=8
03-13 14:11:17.474  3927 30116 D BtGatt.GattService: unregisterClient() - clientIf=8
03-13 14:11:17.477  8509  8601 D ReactNativeBleManager: Peripheral event (BleManagerDisconnectPeripheral):80:EA:CA:70:01:0A
03-13 14:11:17.478  8509  8543 D ReactNativeJS: 'BleManagerDisconnectPeripheral ', { status: 8, peripheral: '80:EA:CA:70:01:0A' }
03-13 14:11:17.478  3927  4077 E bt_btif : No such connection need to be cancelled
03-13 14:11:17.478  3927  4077 E bt_btif : bta_gattc_mark_bg_conn unable to find the bg connection mask for: 80:ea:ca:70:01:0a

Steps to reproduce

Connect to multiple devices; I’m using 4
Get data from devices via notifications regularly; mine happen ~6sec from each device.
Let run for many hours.

Issue Analytics

State:
Created 4 years ago
Comments:6 (6 by maintainers)

Top GitHub Comments

1reaction

anwarhamrcommented, Oct 3, 2020

I have solved this issue by using a long running scan. Prior I was running a scan about every 10 seconds that lasted for 5 seconds. By doing so, somehow it leaked GATT objects. I have made the following change and have not yet hit the gatt object limit. I now run a scan for 30 minutes or until all my devices are connected. Because sometimes a client connects and disconnects immediately, I delay the stop scan for another 10 seconds to ensure all clients are still connected.

My lessons learned:

don’t scan often, scan once and let it run longer than you think
don’t call connect to a client that really isn’t available; I thought that once I had discovered a client and I had the clients ID I would just periodically attempt to connect instead of running a scan. I ran out of GATT objects with this pattern as well but not a soon as short scans

0reactions

anwarhamrcommented, Sep 23, 2020

I am now sure that scanning is not letting go of the resources some how some way. On an android 6 tablet. I run a scan loop every 10 seconds that has a duration of 5 seconds. As you can see below, the clientif value just keeps climbing until it finally runs out of GATT objects.

Does anyone one see anything suspect here? https://gist.githubusercontent.com/anwarhamr/207f3ba5111f9c00bc7e26e8fc716c7b/raw/6e8859a3030ef40133d09fb0096ae899ab3d3898/scan%2520only%2520every%252010s%2520for%25205s

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