Can you provide an example of using the MvvmCross.Plugin.BLE plugin

Step 1: Install the Plugin

First, you need to install the MvvmCross.Plugin.BLE NuGet package in your project. You can do this using the NuGet Package Manager Console:

bash
Install-Package MvvmCross.Plugin.BLE

Or, if you prefer using the .NET CLI:

bash
dotnet add package MvvmCross.Plugin.BLE

Step 2: Register the Plugin

In your MvvmCross setup, you need to register the BLE plugin. This is typically done in the `App.cs` file of your Core project. You can register the plugin by overriding the `InitializeFirstChance` method:

csharp
public override void InitializeFirstChance()
{
    base.InitializeFirstChance();

    // Register the BLE plugin
    Mvx.RegisterSingleton(() => Mvx.Resolve());
    Mvx.RegisterSingleton(() => CrossBluetoothLE.Current.Adapter);
}

However, the MvvmCross plugin for BLE typically registers `IBluetoothLE` and `IAdapter` as lazy initialized singletons automatically, so you might not need to manually register them unless you're using a custom setup.

Step 3: Use the Plugin

To use the BLE functionality, you can inject `IBluetoothLE` and `IAdapter` into your ViewModels or services. Here's how you can do it:

Using Constructor Injection

csharp
public class MyViewModel : MvxViewModel
{
    private readonly IBluetoothLE _ble;
    private readonly IAdapter _adapter;

    public MyViewModel(IBluetoothLE ble, IAdapter adapter)
    {
        _ble = ble;
        _adapter = adapter;
    }

    // Use _ble and _adapter as needed
}

Resolving Services Manually

Alternatively, you can resolve these services manually using `Mvx.Resolve`:

csharp
var ble = Mvx.Resolve();
var adapter = Mvx.Resolve();

Step 4: Implement BLE Functionality

Now that you have access to the BLE services, you can implement the necessary functionality. For example, you can check the Bluetooth state and listen for state changes:

csharp
var state = ble.State;

ble.StateChanged += (s, e) =>
{
    Debug.WriteLine($"The Bluetooth state changed to {e.NewState}");
};

Additional Considerations

- Permissions: Ensure that your app has the necessary permissions to access Bluetooth. For Android, this involves adding permissions to your `AndroidManifest.xml`.
- Linker Configuration: If you encounter issues with the linker stripping out necessary code, ensure you have the appropriate linker configuration in place, such as including the necessary types in your `LinkerPleaseLink.cs` file.

Conclusion

The MvvmCross.Plugin.BLE provides a convenient way to integrate BLE functionality into cross-platform applications using MvvmCross. By following these steps, you can easily access and manage Bluetooth Low Energy devices across different platforms.