手机进入睡眠状态后,在前台服务中保持WiFi活动

我想在手机锁定时接收来自WiFi的数据包。问题是,当我锁定屏幕时,前台服务停止接收数据包。我使用的前台服务如下:

public override StartCommandResult OnStartCommand(Intent intent, StartCommandFlags flags, int startId)
{
    var notification = new Notification.Builder(this)
        .SetContentTitle(Resources.GetString(Resource.String.app_name))
        .SetContentText(Resources.GetString(Resource.String.notification_text))
        .SetSmallIcon(Resource.Drawable.ic_stat_name)
        .SetContentIntent(BuildIntentToShowMainActivity())
        .SetOngoing(true)
        .AddAction(BuildRestartTimerAction())
        .AddAction(BuildStopServiceAction())
        .Build();


    // Enlist this instance of the service as a foreground service
    StartForeground(Constants.SERVICE_RUNNING_NOTIFICATION_ID, notification);

    /*DO THIS EVEN WHEN SCREEN IS LOCKED*/

    var powerManager = (PowerManager)GetSystemService(PowerService);
    _wakeLock = powerManager.NewWakeLock(WakeLockFlags.Partial, "WakeLockTag");
    _wakeLock.Acquire();

    var wifiManager = (WifiManager)GetSystemService(WifiService);
    _wifiLock = wifiManager.CreateWifiLock(WifiMode.FullHighPerf, "xamarin_wifi_lock");
    _wifiLock.Acquire();

    if (!powerManager.IsIgnoringBatteryOptimizations("com.xamarin.xample.foregroundservicedemo") ||
        !_wakeLock.IsHeld || !_wifiLock.IsHeld)
        throw new InvalidOperationException("OPTIMIZATIONS NOT ACTIVE");

    string msg = timestamper.GetFormattedTimestamp();
    Log.Debug(TAG, msg);
    Intent intent = new Intent(Constants.NOTIFICATION_BROADCAST_ACTION);
    intent.SetAction(Android.Provider.Settings.ActionIgnoreBatteryOptimizationSettings);
    intent.PutExtra(Constants.BROADCAST_MESSAGE_KEY, msg);
    LocalBroadcastManager.GetInstance(this).SendBroadcast(intent);
    Task.Run(() =>
    {
        using (var client = new UdpClient(12345))
        {
            while (true)
            {
                var result = client.ReceiveAsync().Result;
                Console.WriteLine($"RECEIVED: {result.Buffer.Length}");
            }
        }
    });

    return StartCommandResult.Sticky;
}

我要做以下事情来确保 没有被杀 :

1. 正在启动前台服务
2. 使用 StartCommandResult.Sticky
3. 使用唤醒锁定
4. 使用WiFi锁
5. 将wifisleeppolicy设置为 Never (我的手机里有它 设置)
6. 设置 ActionIgnoreBatteryOptimizationSettings 意图
7. 调试时通过adb命令提示白名单我的应用程序

我还缺什么?我正在使用三星A5和Android 6.0-API 23。

我查看了adb命令提示符中的日志,并检查了我的服务实际上是作为前台服务运行的,并且所有锁都被持有。