To start the conversation again, simply ask a new question. I'm havig an issue with the Push Notification service. I have created a back-end that registers device tokens to send to the APNS when I want to send a push notification. This system was written in php. Everything works completely fine! But recently the system started failing about two months ago. It sent about half the registered users a notification and then stopped.
I have rewritten the back-end in python for more control in error handling. The issue that APNS gave me was that there was an invalid token in the database. This one: 1f5d3edd8cad36eddba53bf56c81e5b5dfabd22b5e registered with application ID nl. The theory was that it was a beta token from a beta certificate. So I have tried sending it to the APNS using the development push certificate and the sandbox from the app that uses it.
This however also said it is an invalid token!? The feedback service said nothing about it Did the APNS system release an invalid token? My question now is: what makes APNS device token invalid?
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am trying to store device tokens on the server side in a mysql database, and would like to know maximum size of device tokens generated.
You get told but it's currently 32 bytes. Apple says the token length is variable and to not hard code it. When you get a notification it has a header, currently 35 bytes in size. This is arranged as follows:. Apple Push Notification Service Programming guide very clearly says:.
Here's a link to their page on "Local and Push Notification Programming," which may include other helpful information on the subject. The limit in iOS8 is reported to be 2k. Still half of the size of GCM's 4k, but I suspect most people will have to alter their tables to handle the new iOS8 token limit.
Learn more. Size of iPhone device token Ask Question. Asked 7 years, 7 months ago. Active 3 years, 1 month ago. Viewed 34k times. Active Oldest Votes. Apple says the token length is variable and to not hard code it When you get a notification it has a header, currently 35 bytes in size.
Philip Whitehouse Philip Whitehouse 3, 3 3 gold badges 19 19 silver badges 36 36 bronze badges. But you are mentioning Bytes Token-based authentication offers a stateless way to communicate with APNs.
Stateless communication is faster than certificate-based communication because it does not require APNs to look up the certificate, or other information, related to your provider server. There are other advantages to using token-based authentication:. Token-based requests are slightly larger than certificate-based requests because each request contains the token.
You must also update and encrypt your tokens at least once an hour using the provider token signing key that Apple provides you.
You need an APNs authentication token signing key to generate the tokens used by your server. You request this key from your developer account on developer.
An authentication token signing key, specified as a text file with a. Secure both pieces of information carefully. You will use the authentication token signing key to encrypt your JSON tokens, so this key must remain private to prevent anyone else from generating those tokens.
For detailed instructions on how to request an authentication token signing key, see Communicate with APNs using authentication tokens in Xcode Help. The token itself contains four key-value pairs, which are described in Table 1. The encryption algorithm you used to encrypt the token. Obtain this value from your developer account.
Specify the value as the number of seconds since Epoch, in UTC. The value must be no more than one hour from the current time.
The header of the token contains the encryption algorithm and Key ID, and the claims payload contains your Team ID and the token generation time. Listing 1 shows an example of a JSON token for a fictional developer account.
Encrypt the resulting JSON data using your authentication token signing key and the specified algorithm. Your provider server must include the resulting encrypted data with all notification requests. When creating the POST request for a notification, include your encrypted token in the authorization header of your request. For security, APNs requires you to refresh your token regularly.Remote notifications also known as push notifications let you push small amounts of data to devices on which your app is installed, even when your app isn't running.
Apps use notifications to keep the user informed. For example, a messaging service sends remote notifications when new messages arrive for the user. You decide when you want to send notifications to your users. When it's time to send a notification, you generate a request containing the notification data and a unique identifier for the user's device. Upon receipt of the notification, the operating system on the user's device handles any user interactions and delivers the notification to your app.
You're responsible for setting up a provider server or servers and for configuring your app to handle notifications on the user's device. Apple manages everything in between, including the presentation of notifications to the user. You must also have an app running on the user's device that can communicate with your server and provide needed information.
Here are the main tasks for setting up a remote notification server. How you implement these tasks depends on your infrastructure, and you are free to use whatever technologies that are appropriate for your company.
Write code to receive device tokens from instances of your app running on user devices, and to associate those tokens with your users' accounts. Determine when to send notifications to your users, and write code to generate notification payloads.
See Generating a Remote Notification. For token-based authentication, regenerate your token periodically. Communication between your provider server and APNs must take place over a secure connection.
Creating that connection requires installing a GeoTrust Global CA root certificate on each of your provider servers. If your provider server runs macOS, this root certificate is in the keychain by default.
On other systems, you might need to install this certificate yourself. You can download this certificate from the GeoTrust Root Certificates website. Both techniques have advantages and disadvantages, so decide which technique is best suited for your company.
APNs makes every effort to deliver your notifications, and to deliver them with the best user experience:.This weekend, I spent some time getting some apps updated with the latest Xamarin, iOS, Android, etc.
A lot of these apps make use of push notifications across platforms. I was running some automated tests against them to do the following steps:. I noticed immediately that all my new iOS builds were failing to receive any push notifications after updating registrations.
This processes kicks off the internal iOS process to start registration. It will check against your apps registered entitlements for push, check the environment it should be using between development and productionand then if all goes well, it will hit the RegisteredForRemoteNotifications UIApplication application, NSData deviceToken method in the AppDelegate. The token was no longer in the same format… Feeling like an idiot who has been out of the loop, I hit the internet to see what I missed and landed on some of these lovely articles and posts:.
So basically we need a clean version of that bytes property of the NSData object. There are a few different ways to write this ExtractToken method, but this is what has worked for me!. Interested in sponsoring developer content? Hi Alex! Thanks for your article. I personally like to let appcenter. Like Liked by 1 person. Hope you dont like it too much!
Like Like. Luckily the migration guide to azure notification hubs is pretty solid. Empty for the old way prior to ios Good catch. ToArray ; return BitConverter.
ToString bytes. Thanks for your great article.
RegisterNativeAsync method to register a tag in the future? I am planning to store the string in local database. Depends on what you need. I use xamarin essentials to store the extracted string, personally. You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account. You are commenting using your Facebook account.
Notify me of new comments via email.Your request must include the following information:. It then tries to send your JSON payload to that device.
Xamarin.Tip – iOS Push Notification Device Token Extraction in iOS 13+
Development server: api. Use the production server for your shipping apps and the development server for testing. When sending many remote notifications, you can establish multiple connections to these servers to improve performance. For example, if you have multiple provider servers, each one can establish its own connection. The exact number varies based on server load and whether you use a provider certificate or an authentication token.
For example, when using an authentication token, APNs allows only one stream until you post a request with a valid authentication token. If your provider certificate is revoked, or if you revoke your authentication token, close all connections to APNs, fix the problem, and then open new connections.
For a list of values for the reason key, see. To construct your POST notification, you must already have the following pieces of information:. In addition to the preceding data, add the header fields in Table 1 to your request.
Some header fields are required for delivering the notification. Required The path to the device token. Your app receives the bytes for this device token when registering for remote notifications; see Registering Your App with APNs. APNs ignores this header if you use certificate-based authentication. If there is a mismatch, or if the header is missing on required systems, APNs may return an error, delay the delivery of the notification, or drop it altogether.
If an error occurs when sending the notification, APNs includes this value when reporting the error to your server.
Canonical UUIDs are 32 lowercase hexadecimal digits, displayed in five groups separated by hyphens in the form An example looks like this: ee89bd3-aa0. The date at which the notification is no longer valid. If the value is nonzero, APNs stores the notification and tries to deliver it at least once, repeating the attempt as needed until the specified date. The priority of the notification. If you omit this header, APNs sets the notification priority to Local and Remote Notification Programming Guide.
A provider is a server, that you deploy and manage, that you configure to work with APNs. To securely connect to APNs, you can use provider authentication tokens or provider certificates. This section describes connections using tokens. A provider authentication token is a JSON object that you construct, whose header must include:.
The encryption algorithm alg you use to encrypt the token. A character key identifier kid key, obtained from your developer account. The issuer iss registered claim key, whose value is your character Team ID, obtained from your developer account. The issued at iat registered claim key, whose value indicates the time at which the token was generated, in terms of the number of seconds since Epoch, in UTC.
After you create the token, you must sign it with a private key. Specify the value ES in the algorithm header key alg. To ensure security, APNs requires new tokens to be generated periodically. A new token has an updated issued at claim key, whose value indicates the time the token was generated. If the timestamp for token issue is not within the last hour, APNs rejects subsequent push messages, returning an ExpiredProviderToken error.
If you suspect your provider token signing key is compromised, you can revoke it from your developer account. You can issue a new key pair and can then generate new tokens with the new private key.
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For maximum security, close all your connections to APNs that had been using tokens signed with the now-revoked key, and reconnect before using tokens signed with the new key. You can use your APNs certificate to send notifications to your primary app, as identified by its bundle ID, as well as to any Apple Watch complications or backgrounded VoIP services associated with that app. Use the 1. For example, if you provide an app with the bundle ID com.
The first step in sending a remote notification is to establish a connection with the appropriate APNs server:. Your provider must support TLS 1. You can use the provider client certificate which you obtain from your developer accountas described in Creating a Universal Push Notification Client SSL Certificate.
After you have this token, you can start to send push messages. You must then periodically update the token; each APNs provider authentication token has validity interval of one hour. APNs allows multiple concurrent streams for each connection. The exact number of streams differs based on your use of a provider certificate or an authentication token, and also differs based on server load.
Do not assume a specific number of streams.