Paired device not being detected by call to Adapter.GetSystemConnectedOrPairedDevices

[TiisangMguni]

Hi, i am running the Maui sample (BLE.Client.Maui) on Android, I have a Bluetooth to serial device (HC06 Serial Bluetooth Brick) already paired with the phone on which i am running the sample app. The Bluetooth to serial device is connected to an Arduino device that continuously writes string data to the Arduino serial port.

The issue i am having is that the device (which shows in my paired devices under the name itead) is never returned by the call to
Adapter.GetSystemConnectedOrPairedDevices();. I can however connect to the device using other android apps from the google play store and read the data that it sends continuously.

Expected behavior

Expected a list with all paired devices

Actual behavior

The call only returns my paired Airpods

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[JuLights]

same problem, GetSystemConnectedOrPairedDevices() doesn't return anything, but I can see it(ESP32test) in android.bluetooth.BluetoothAdapter.BondedDevices.

[Auto72]

I want to summarize the behavior of the Adapter.GetSystemConnectedOrPairedDevices() method with the BLE.Plugin ver. 3.1.0-beta.

var pdList = Adapter.GetSystemConnectedOrPairedDevices();
foreach(var pd in pdList) 
{
    Debug.WriteLine($"Name: {pd.Name} | Id: {pd.Id} | IsConnectable: {pd.IsConnectable} |");
}

On Android it works form me, I get the list of paired BLE devices.

On Windows doesn't work form me, what it works form me is the following:

    public override IReadOnlyList<IDevice> GetSystemConnectedOrPairedDevices(Guid[] services = null)
    {
        string pairedSelector = BluetoothLEDevice.GetDeviceSelectorFromPairingState(true);
        DeviceInformationCollection pairedDevices = DeviceInformation.FindAllAsync(pairedSelector).GetAwaiter().GetResult();
        List<IDevice> devlist = ConnectedDevices.ToList();
        List<Guid> ids = ConnectedDevices.Select(d => d.Id).ToList();
        foreach (var dev in pairedDevices)
        {
            Guid id = dev.Id.ToBleDeviceGuidFromId();
            ulong bleaddress = id.ToBleAddress();
            if (!ids.Contains(id))
            {
                var bluetoothLeDevice = BluetoothLEDevice.FromBluetoothAddressAsync(bleaddress).AsTask().Result;
                if (bluetoothLeDevice != null)
                {
                    var device = new Device(this, bluetoothLeDevice, 0, id);
                    devlist.Add(device);
                    ids.Add(id);
                    Trace.Message("GetSystemConnectedOrPairedDevices: {0}: {1}", dev.Id, dev.Name);
                }
                else
                {
                    Trace.Message("GetSystemConnectedOrPairedDevices: {0}: {1}, BluetoothLEDevice == null", dev.Id, dev.Name);
                }
            }
        }
        return devlist;
    }

NOTE: we need to use BluetoothLEDevice, instead of the current BluetoothDevice.

On iOS I get the following error when I try to call the method .GetSystemConnectedOrPairedDevices()

Value cannot be null. (Parameter 'serviceUUIDs')

    public override IReadOnlyList<IDevice> GetSystemConnectedOrPairedDevices(Guid[] services = null)
    {
        // NOTE: to avoid the null error, instead of using 'null' here, we need to use 'new CBUUID[1]'
        CBUUID[] serviceUuids = null;
        if (services != null)
        {
            serviceUuids = services.Select(guid => CBUUID.FromString(guid.ToString())).ToArray();
        }

        var nativeDevices = _centralManager.RetrieveConnectedPeripherals(serviceUuids);

        return nativeDevices.Select(d => new Device(this, d, _bleCentralManagerDelegate)).Cast<IDevice>().ToList();
    }

Anyway, even if I fix the problem in iOS that way, it doesn't return my paired BLE device, that I can see listed in 'My Devices' under the Bluetooth Settings.

I need help in iOS, in order to get my paired BLE device listed by the method .GetSystemConnectedOrPairedDevices()