Azure 通知中心收到无法解释的 'APNS Channel Expired' 错误

Question

我在使用 Azure 通知中心时遇到问题。我的 iOS 设备最初已正确注册并接收推送。然而，偶尔会有一两个设备莫名其妙地停止接收推送通知。调试此问题似乎是由于 APNS 使设备注册的通道过期：

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% 保证此设备不是通过通知中心手动注销的。我正常使用该应用程序，收到一些推送，然后它停止接收任何推送。

作为参考，应用程序通过 WebAPI 后端注册到 Azure 通知中心。作为参考，这里是注册设备以在用户登录或应用程序 returns 到前台时进行推送的代码。如果我在此逻辑中做错了什么，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;
}

谁能告诉我是什么原因导致设备在未对其（最初成功的）注册进行任何更改时使用 APNS 过期？

Answer 1

设备必须定期向 APNS 重新注册，以确保它们拥有有效的令牌。如果他们不这样做，那么他们将不会收到推送（一旦失败回调触发其删除，您将看到设备注册在通知中心消失）。这是设计使然：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。这意味着一旦 APNS 未能向设备发送一条消息，它就会立即被删除；这是没有余地的。为了解决这个问题，我指定了 class 的 Expiry 属性，以便在发送通知和设备确认通知之间存在延迟。这意味着此后没有任何设备被 APNS 不当取消注册。

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

Azure 通知中心收到无法解释的 'APNS Channel Expired' 错误

Azure Notification Hub receiving unexplained 'APNS Channel Expired' errors

c#

notifications

azure

apple-push-notifications

azure-notificationhub