[SteamVR][Unity] Get tracked object serial number

SteamVR_GetTrackedObjectSerialNumber.cs

using UnityEngine;
using Valve.VR;

public class SteamVR_GetTrackedObjectSerialNumber : MonoBehaviour
{
    private void Start()
    {
        uint index = 0;
        ETrackedPropertyError error = new ETrackedPropertyError();
        for (uint i = 0; i < 16; i++)
        {
            var result = new System.Text.StringBuilder((int)64);
            OpenVR.System.GetStringTrackedDeviceProperty(i, ETrackedDeviceProperty.Prop_SerialNumber_String, result, 64, ref error);

            Debug.Log(result);
        }
    }
}