Phone does not disconnect from peer if reconnecting after the disconnected event arrives

[maBarabas]

Describe the bug

The phone did not disconnect from the remote device when calling disconnect.

To Reproduce Steps to reproduce the behavior:

1. Connect to one device using connectToAdvertisingDevice()
2. Wait for the connected event
3. Disconnect
4. Wait for the disconnected event
5. Reconnect to the same device using connectToAdvertisingDevice()

Notice that the second connects completes very quickly. Also notice that as far as the peer device is concerned, we never disconnected from it. It seems like that when I received the disconnected event, the disconnect was still in progress, it was cancelled and the previous connection was reused.

Expected behavior

When I receive the disconnected event, then the phone has been disconnected from the peer.

• [ ] I tried doing the same with a general BLE scanner application (e.g. nRF Connect) and it exhibits the expected behavior as described above

Smartphone / tablet

• Device: Pixel 5, Galaxy Note 10+, Xperia 5
• OS: Android 11, 12, 13
• Package version: 5.0.3

Peripheral device

• Vendor, model: custom
• Does it run a custom firmware / software: yes

Additional context

iPhone works as expected.

[meuhle]

@maBarabas how do you handle the disconnection and reconnection? I had a similar issue but now is workign good

[Gufdoor]

@maBarabas having the same issue here, but instead I'm using connectToDevice()

[meuhle]

@maBarabas @Gufdoor I found the right way to handle the disconnection this is how i connect to the device

connection = g.flutterReactiveBle.connectToAdvertisingDevice(
        id: g.device.id,
        prescanDuration: scanTime(),
        withServices: [g.serviceUuid, g.cmdChar, g.debChar]).listen((event) {
      deviceConnectionController.add(event);
      switch (event.connectionState) {

And this is how i handle the disconnection

connection.cancel();
        deviceConnectionController.add(
          ConnectionStateUpdate(
            deviceId: g.device.id,
            connectionState: DeviceConnectionState.disconnected,
            failure: null,
          ),