ARMeshSupportedEvents.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.XR.ARFoundation;

public class ARMeshSupportedEvents : MonoBehaviour
{
    public bool debugLog;
    public UnityEvent meshSupportedDeviceAwake;
    public UnityEvent meshUnsupportedDeviceAwake;
    ARMeshManager arMeshManager;
    bool arSessionReady;

    void Awake()
    {
        arSessionReady = false;

        arMeshManager = FindObjectOfType<ARMeshManager>();

        if (arMeshManager != null)
            StartCoroutine(Init());
        else
            Debug.Log("ARMeshManager is null on ARMeshSupportedEvents");
    }

    IEnumerator Init()
    {
        while(!arSessionReady)
        {
            if (ARSession.state == ARSessionState.Ready)
            {
                arSessionReady = true;
                if (arMeshManager.subsystem != null)
                {
                    if (debugLog)
                        Debug.Log("invoking mesh Supported DeviceAwake()");
                    meshSupportedDeviceAwake.Invoke();
                }
                else
                {
                    if (debugLog)
                        Debug.Log("invoking mesh Unsupported DeviceAwake()");
                    meshUnsupportedDeviceAwake.Invoke();
                }
            }
            yield return null;
        }
    }
}