Android and iOS errors

[zoanthal]

Works OK in Android. I frequently/occasionally get this error:

[0:] Yort.Ntp.NtpNetworkException: OperationAborted
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in :0
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0003e] in :0
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in :0
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in :0
at System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult () [0x00000] in :0
at DMRxForPrimaryCare.SA_AsyncCalls+d__11.MoveNext () [0x000a2] in C:\Xamarin\DMRxForPrimaryCare\DMRxForPrimaryCare\DMRxForPrimaryCare\SA_AsyncCalls.cs:379

On iOS, no luck. Stacktrace:

Yort.Ntp.NtpNetworkException: This method is not implemented by this class. ---> System.NotImplementedException: This method is not implemented by this class.
at System.Net.EndPoint.Serialize () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/mcs/class/referencesource/System/net/System/Net/EndPoint.cs:40
at System.Net.Sockets.Socket.Connect (System.Net.EndPoint remoteEP) [0x00070] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/mcs/class/System/System.Net.Sockets/Socket.cs:868
at Yort.Ntp.NtpClient.SendTimeRequest () [0x00092] in :0

Implementation:

    public static DateTime localLastNTPCheckUTC = DateTime.UtcNow;
    public static bool havecheckedNTP = false;
    public static bool failedNTP = false;
    public static DateTime lastNTP = DateTime.UtcNow;

    public static async Task<DateTime> GetAtomicTimeJSON()
    {
        try
        {
            if (havecheckedNTP)
            {
                TimeSpan t = DateTime.UtcNow - localLastNTPCheckUTC;
                if (t.TotalMilliseconds <= 4000)
                {
                    return lastNTP.AddMilliseconds(t.TotalMilliseconds);
                }
            }

            NtpClient client = new NtpClient(KnownNtpServers.PoolOrg);
            DateTime currentTime = await client.RequestTimeAsync();
            //Debug.WriteLine("NTP success: "+currentTime.ToString());
            havecheckedNTP = true;
            failedNTP = false;
            lastNTP = currentTime;
            return currentTime;
        }
        catch (Exception ex)
        {
            havecheckedNTP = false;
            failedNTP = true;
            Debug.WriteLine("NTP failure");
            Debug.WriteLine(ex.ToString());
            return System.DateTime.UtcNow;
        }
    }

[Yortw]

Hi,

Sorry, have been busy this week. The iOS problem sounds similar to an issue that occurred on Android initially, but I didn't think applied to iOS. Unfortunately I don't have access to any Apple equipment this week to investigate.

Could you please try the same code, but initialising the NtpClient class with the IP address of the server rather than name? i.e

    NtpClient client = new NtpClient("64.99.80.121")

and let me know if that works or not?

Thanks.

[zoanthal]

Hi! Thanks for the tip. Unfortunately I switched to a different solution for NTP already. I'd also prefer to avoid hardcoding IPs for NTP lookup... That's not best practice according to NTP resources. Sent from mobile Vikas O'Reilly-Shah, MD, PhD Assistant Professor of Anesthesiology Division of Pediatric Anesthesiology Emory University School of Medicine and Children's Healthcare of Atlanta

…

On Wed, Mar 21, 2018, 03:03 Troy Willmot ***@***.***> wrote: Hi, Sorry, have been busy this week. The iOS problem sounds similar to an issue that occurred on Android initially, but I didn't think applied to iOS. Unfortunately I don't have access to any Apple equipment this week to investigate. Could you please try the same code, but initialising the NtpClient class with the IP address of the server rather than name? i.e NtpClient client = new NtpClient("64.99.80.121") and let me know if that works or not? Thanks. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#9 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ASQatEy3_wTq4-lOKhX3evLJe9IgB8loks5tgfsmgaJpZM4Ss2o7> .

[Yortw]

That's ok.
PS: I wasn't suggesting this as a long term solution, just to see if it worked for you, as that would prove if it is the same issue I already have a solution for on Android.