iOS Question Proper way to manage tokens (Firebase)

[Mike1970]

Hi everyone, i managed to get firebase working, with KEY approach instead of certificates.
Now i need to send notification with topics, and tokens.

on iOS i get the token when FCM connects with:

Sub GetToken As String
    Dim no As NativeObject
    Dim token As NativeObject = no.Initialize("FIRInstanceID").RunMethod("instanceID", Null).RunMethod("token", Null)
    If token.IsInitialized Then Return token.AsString Else Return ""
End Sub

My questions are:
Is there a proper way to mange the tokens?*
How frequently they change?
Is there a sub that fires when the token changes, or I've to check every time the app is opened?

*now i've an api to update the token of the user on my online DB, that it's called everytime the app opens up and the token is different from the preovius stored (i don't know if doing so is correct)


Thanks in advance for the suggestions

 

[Erel]

Why use tokens? Subscribe to a unique topics instead. Simpler and with less surprises.

 

[Mike1970]

Why use tokens?

Because i need to send "personal" notifications.

E.g.
Bob have to receive the notification
Anna have not
Carl have not
etc...

Do you mean to create a topic for every user?
like:
topic_bob, topic_anna, topic_carl?
In this case, is there not a limit of topics that i can create?

 

[Erel]

Do you mean to create a topic for every user?

Yes.

In this case, is there not a limit of topics that i can create?

No.

 

[Alexander Stolte]

Is there a proper way to mange the tokens?*

Save it in your backend. Save the token on the device and compare it with the token you receive with GetToken, if he changes, then update it in your backend.
How frequently they change?
[/QUOTE]

Set up a Firebase Cloud Messaging client app on Android

firebase.google.com

 

[Mike1970]

Save it in your backend. Save the token on the device and compare it with the token you receive with GetToken, if he changes, then update it in your backend.
How frequently they change?

Set up a Firebase Cloud Messaging client app on Android

firebase.google.com

[/QUOTE]
Thanks for answering
that was the method I wanted to use, but actually if there is no limit to how many topics I can use, is better using topics instead of tokens that changes and do strange things, as Erel say