如何在 Unity3D HoloLens 应用程序上检测 BLE 信标？

Question

I have built an app in Unity3D which should be able to detect Bluetooth Low-Energy beacons on the Microsoft HoloLens. Here is the Unity C# script code that I used to get this done.

using UnityEngine;
using Windows.Devices.Bluetooth.Advertisement;

public class BeaconDetector : MonoBehaviour
{

    private BluetoothLEAdvertisementWatcher _watcher;

    void Start()
    {
        _watcher = new BluetoothLEAdvertisementWatcher();
        _watcher.Received += WatcherOnReceived;
        _watcher.Start();
    }

    //This method should be called when a beacon is detected
    void WatcherOnReceived(BluetoothLEAdvertisementWatcher sender, BluetoothLEAdvertisementReceivedEventArgs args)
    {
        //Just a simple check if this method is even called
        Debug.Log("Beacon detected!");
    }

}

The app builds and runs on the HoloLens nicely, but (even after waiting a couple of minutes) I do not get the desired output line in my debug log. This means to me that the WatcherOnReceived() method is never called, which ultimately means that no beacon is detected .

I use some Sensoro SmartBeacon-4AA 's which can transmit both iBeacon and Eddystone signals.

I have been trying this for a couple of weeks right now, did several tutorials along the way but I still can not figure out why this is not working for me.

Answer 1

It was a permission problem after all. It is possible to solve this issue in both Unity (pre-build) and Visual Studio (post-build). Here are both solutions:

Solution A: in Unity

1. Head to Edit > Project Settings > Player .
2. In the Inspector , open up the tab Publishing Settings .
3. Under the Capabilities section, make sure that Bluetooth is enabled .

Click on the .gif to expand

Solution B: in Visual Studio (2017)

1. In your Solution Explorer (Ctrl+Alt+L), expand your project.
2. Double-click the Package.appxmanifest .
3. Go to the Capabilities tab.
4. Again, make sure that Bluetooth is enabled .

Click on the .gif to expand

This will give your app the right to use Bluetooth on the HoloLens.