HoHCI-BikeSim/Assets/Scripts/Tracking/TrackerIndexManager.cs

using System.Collections.Generic;
using System.Linq;
using System.Text;
using UnityEngine;
using Valve.VR;
using Debug = UnityEngine.Debug;

namespace Tracking
{
    public class TrackerIndexManager : MonoBehaviour
    {
        private IEnumerable<IViveTracker> trackers;

        private void OnEnable()
        {
            SteamVR_Events.DeviceConnected.Listen(OnDeviceConnected);
            trackers = GetComponentsInChildren<IViveTracker>();
        }

        private void OnDeviceConnected(int index, bool connected)
        {
            if (index < 0) return;
            if (!connected || OpenVR.System == null) return;

            var deviceClass = OpenVR.System.GetTrackedDeviceClass((uint) index);
            if (deviceClass != ETrackedDeviceClass.GenericTracker) return;

            var error = ETrackedPropertyError.TrackedProp_Success;
            var serialNumberBuilder = new StringBuilder();
            OpenVR.System.GetStringTrackedDeviceProperty((uint) index,
                ETrackedDeviceProperty.Prop_SerialNumber_String, serialNumberBuilder, 64, ref error);

            if (error != ETrackedPropertyError.TrackedProp_Success)
            {
                Debug.LogError($"Could not get serial number for tracker at index {index}");
            }
            else
            {
                UpdateTrackerObject(serialNumberBuilder.ToString(), index);
            }
        }

        private void UpdateTrackerObject(string id, int index)
        {
            Debug.Log($"Tracker with serial number {id} got connected at index  {index}");

            var t = trackers.FirstOrDefault(tracker => tracker.Id == id);
            t?.TrackedObject.SetDeviceIndex(index);
        }
    }
}