On Wed, Apr 20, 2016 at 12:19 PM, Matthias Wessendorf <matzew@apache.org> wrote:
Hi,

the format for tokens received from InstanceID API have a slightly different format:

It's basically (prefix_string : RegistrationID).

Now, in order to be able to subscribe on a topic is it _really_ required to have a 'new' InstanceID token ? I could not find a _clear_ statement

looks like InstanceID tokens are required:
https://developers.google.com/android/reference/com/google/android/gms/gcm/GcmPubSub#public-methods

But, on the other hand it does not mention that GCM.register() tokens are not allowed :-)
 

I am asking because I'm working on the server hook to send topic request.

If the answer yes, only InstanceID tokens can subscribe, we need a little switch on the server (not a show stopper):
1) send /topics/{something} (should not affect 'old' tokens_
2) fallback: find tokens w/o the ':', so we can fallback to pure registration Id for "non-Instance ID " tokens


Thanks,
Matthias

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