Detecting wireless Buzz! buzzers with Unity engine

unity-detect-wireless-buzzer.cs

using System;
using System.Collections.Generic;
using HidSharp; // https://www.nuget.org/packages/HidSharp/
using UnityEngine;

namespace Goldsaucer.Askutron.HardwareInput
{
    public class WirelessBuzzBuzzers : MonoBehaviour
    {
        class ConnectedReceiver
        {
            public DeviceStream stream;
        }

        private readonly List<ConnectedReceiver> _connected = new List<ConnectedReceiver>();

        private void Start()
        {
            if (!Application.isEditor)
            {
                Detect();
            }
            else
            {
                // do not detect buzzers every time because this crashes the editor
                // due to some bug in the HID library
                // Use the reset function of this component to explicitly detect
                // buzzers once. 
            }
        }

        private void Reset()
        {
            Detect();
        }

        public void Detect()
        {
            foreach (var dev in DeviceList.Local.GetAllDevices())
            {
                Debug.Log("Found device: " + dev.GetFriendlyName());

                if (dev.GetFriendlyName().ToLower().Contains("wbuzz"))
                {
                    ConnectBuzzer(dev);
                }
                else if (dev.GetFriendlyName().ToLower().Contains("buzz"))
                {
                    Debug.Log($"Found potential buzzer ${dev.GetFriendlyName()}");
                }
            }
        }

        private void ConnectBuzzer(Device device)
        {
            DeviceStream stream;
            
            if (device.TryOpen(out stream))
            {
                stream.Write(new byte[] { 0x0 }, 0, 1);
                _connected.Add(new ConnectedReceiver() {stream = stream});
                Debug.Log("Connected " + device.GetFriendlyName());
            }
            else
            {
                Debug.Log("Could not connect " + device.GetFriendlyName());
            }
        }

        private void OnDestroy()
        {
            foreach (var receiver in _connected)
            {
                receiver.stream.Dispose();
            }
        }
    }
}