Unable to Find BLuetooth Devices after Scanning

Can’t see any device during Scanning… I tried with Android Emulator 13 and also installed app on phone (Samsung) but was not successful on .net 6 MAUI

I am using API version 2.3.1

public partial class DeviceScanner
{
[Inject]
public BluetoothService BluetoothService { get; set; }

private Status workflow;
public string workflowText;

private HashSet<DeviceNode> devices = new();
private DeviceNode selectedDevice = null;
private SemaphoreSlim semaphoreSlim = new(1, 1);


private async void OnSearch()
{
    await semaphoreSlim.WaitAsync();
    try
    {
        devices.Clear();
        selectedDevice = null;

        SetWorkflow("Scanning for Devices...", Status.Lock);
        await Task.Delay(1500);

        devices = await BluetoothService.CrossBluetooth.StartDiscoveryAsync(Callback);

        if (devices.Count == 0)
        {
            await Toaster.ShowAsync("Unable to find nearby Bluetooth LE devices. Try again.");
        }
    }
    finally
    {
        var successText = "Scan completed. Select a device and Connect";
        var failureText = "Unable to find nearby Bluetooth LE devices. Try again.";
        var text = devices.Count > 0 ? successText : failureText;
        UnlockWorkflow(text);
    }

}

standalone git repository* Repo

Expected behavior

I expected to recieve visible BLE devices after Scanning

Actual behavior

After calling “devices = await BluetoothService.CrossBluetooth.StartDiscoveryAsync(Callback);” i do not recieve any device , no Bluetooth Device could be seen.

Configuration

<application android:allowBackup="true" android:icon="@mipmap/appicon" android:roundIcon="@mipmap/appicon_round" android:supportsRtl="true"></application>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
<uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
<uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" />

**Version of the Plugin . 2.3.1

**Platform: Android Emulator 13 >

Device: e.g. HTC Sensation /i Phone 7 …

[bonifacebassey]

Yes i also requested permission at runtime.

Well, then you’re most probably doing something wrong somewhere. Hard to tell without a code sample for reproduction (or a working crystal ball) …

I will try it out again in some days and share a Repo to the source code if it doesn’t work

[janusw]

@volcano619 could you find a solution?

Sounds like his problem was solved by this:

had to add Manifest.Permission.AccessCoarseLocation, Manifest.Permission.AccessFineLocation in the runtime permissions

I’m closing this issue. As soon as you do it right, it suddenly starts working 😉