Xamarin.BluetoothLE

To get started, register the IAdapter implementation in AppDelegate.cs and MainActivity.cs:

DependencyService.Register<IAdapter, Adapter>

Then, to retrieve the implementation from your cross-platform code:

DependencyService.Get<IAdapter>();

Note: You should only ever instantiate one instance of IAdapter. I have used the following code to use a single instance throughout my code:

private static readonly IAdapter _bluetoothAdapter;
public static IAdapter BluetoothAdapter { get { return _bluetoothAdapter; } }

static App() {
    _bluetoothAdapter = DependencyService.Get<IAdapter>();

    _bluetoothAdapter.ScanTimeout = TimeSpan.FromSeconds(10);
    _bluetoothAdapter.ConnectionTimeout = TimeSpan.FromSeconds(10);
}

Then, the IAdapter can be retrieved with:

App.BluetoothAdapter

Once you have an IAdapter, see the documentation here for usage.

Nuget

The library can be installed as a nuget package. Currently can be found as a pre-release.