requestLEScan: Max gatt client reached: 32, no response from capacitor

[andrew-aladjev]

Describe the bug
Gatt leaks in Android BLE. It is well know thing, but capacitor ble plugin didn't provide a way to handle this issue.

To Reproduce
Steps to reproduce the behavior:

1. Try to use requestLEScan in android app.
2. Destroy app process during scan (don't call stopLEScan).
3. Repeat this thing 32 times.

Capacitor/Plugin: To native (Capacitor plugin): callbackId: 7257068, pluginId: BluetoothLe, methodName: addListener
Capacitor: callback: 7257068, pluginId: BluetoothLe, methodName: addListener, methodData: {"eventName":"onScanResult"}
Capacitor/Plugin: To native (Capacitor plugin): callbackId: 7257069, pluginId: BluetoothLe, methodName: requestLEScan
Capacitor: callback: 7257069, pluginId: BluetoothLe, methodName: requestLEScan, methodData: {"services":[],"allowDuplicates":true}
DeviceScanner: Start scanning.
BluetoothAdapter: isLeEnabled(): ON
bt_stack: [INFO:le_scanning_manager.cc(141)] RegisterScanner in shim layer
bluetooth: packages/modules/Bluetooth/system/gd/hci/le_scanning_manager.cc:597 register_scanner: Unable to register scanner, max client reached:32
BluetoothLeScanner: onScannerRegistered() - status=128 scannerId=0 mScannerId=0
Capacitor/Console: File: http://localhost/ - Line 232 - Msg: undefined

I wanted to handle this error and restart BLE, but capacitor is not capable to produce this error. I mean requestLEScan is not calling callbacks, is not throwing errors, it just hangs silently.

Expected behavior
requestLEScan throws some error.

Plugin version:

• @capacitor-community/bluetooth-le: [3.1.4]

Smartphone (please complete the following information):

• Device: Google Pixel 7a API 33
• OS: Android 13

[andrew-aladjev]

I have a good news: I can't reproduce this issue anymore in v6.0.0.