Question

我遇到Azure通知中心问题。我的iOS设备最初正在正确注册并接受推送。然而偶尔会有一两个设备莫名其妙地停止接收推送通知。调试此问题似乎问题是由于APNS使设备注册的频道失效：

设备注册和推送停止之间经过的时间不超过10分钟。我可以100％保证此设备未通过通知中心手动取消注册。我正常使用该应用程序，并接受了一些推动，然后它停止接收任何。

作为参考，该应用程序通过WebAPI后端注册到Azure Notification Hub。作为参考，这里是用户登录或应用程序返回前台时注册设备以进行推送的代码。如果我在这个逻辑中做错了什么，请告诉我：

private async Task<string> RegisterDevice(string token)
{
    string newRegistrationId = null;

    if (!string.IsNullOrWhiteSpace(token))
    {
        var registrations = await _notificationHub.GetRegistrationsByChannelAsync(token, 100);
        foreach (var registration in registrations)
        {
            if (newRegistrationId == null)
            {
                newRegistrationId = registration.RegistrationId;
            }
            else
            {
                await _notificationHub.DeleteRegistrationAsync(registration);
            }
        }
    }

    return newRegistrationId ?? await _notificationHub.CreateRegistrationIdAsync();
}

public async Task<string> CreateOrUpdateRegistration(string userId, string token, string platform, string registrationId = null)
{
    var userDetail = await _userDetailRepo.GetAsync(userId);
    if (userDetail == null)
        throw new ApiException(HttpStatusCode.BadRequest, "User details could not be found");

    if (string.IsNullOrWhiteSpace(registrationId))
        registrationId = await RegisterDevice(token);

    RegistrationDescription registration;
    switch (platform)
    {
        case Settings.Platforms.Android:
            var gcmTemplate = "[REDACTED]"
            registration = new GcmTemplateRegistrationDescription(token, gcmTemplate);
            break;
        case Settings.Platforms.Ios:
            var apnsTemplate = "[REDACTED]";
            registration = new AppleTemplateRegistrationDescription(token, apnsTemplate);
            break;
        default:
            throw new ApiException(HttpStatusCode.BadRequest, "Platform not recognised");
    }

    registration.RegistrationId = registrationId;
    SetDeviceRegistrationTags(registration, userId, userDetail.TwingleAcceptedNotificationEnabled, userDetail.TwingleDeclinedNotificationEnabled, userDetail.MessageReceivedNotificationEnabled, userDetail.ConnectionDeletedNotificationEnabled);

    var registrationStale = false;
    try
    {
        await _notificationHub.CreateOrUpdateRegistrationAsync(registration);
    }
    catch (MessagingException e)
    {
        var webEx = e.InnerException as WebException;
        if (webEx != null && webEx.Status == WebExceptionStatus.ProtocolError)
        {
            var response = (HttpWebResponse)webEx.Response;
            if (response.StatusCode == HttpStatusCode.Gone)
            {
                registrationStale = true;
            }
        }
    }

    // if the registration is stale and/or removed then it needs to be re-created with a new registrationId
    if (registrationStale)
        registrationId = await CreateOrUpdateRegistration(userId, token, platform);

    return registrationId;
}

当没有对其（首次成功）注册进行任何更改时，有人能告诉我导致设备过期的原因是什么？

Answer 1

设备必须定期向APNS重新注册，以确保他们拥有有效的令牌。如果他们没有，那么他们将无法获得推送（一旦失败回调触发其移除，您将看到设备注册在通知中心消失）。这是设计的：https://developer.apple.com/library/ios/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/Chapters/IPhoneOSClientImp.html

Answer 2

问题是因为默认情况下AppleTemplateRegistrationDescriptions将0指定为超时值。这意味着只要APNS无法向设备发送一条消息，它就会被立即删除;没有回旋余地。为了解决这个问题，我指定了类的Expiry属性，以便在发送通知和设备确认之间允许延迟。这意味着APNS从未过度注册任何设备。

AppleTemplateRegistrationDescription registration = new AppleTemplateRegistrationDescription(DeviceToken) 
{ 
    BodyTemplate = new CDataMember(ApnsBodyTemplate)
};
registration.Expiry = DateTime.UtcNow.AddHours(2);
await client.CreateRegistrationAsync(registration);

Azure Notification Hub接收无法解释的APNS频道已过期＆＃39;错误

2 个答案: