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I have the existing app that using GCM and have some issue with GCM reliability. I interested using FCM to replace the GCM, but I doubt about compatibility. I've some google search but still couldn't find a satisfactory answer, here some link:

Migrating from gcm to fcm on android

If FCM inherits from GCM, does FCM also support GCM token? Or we need to some config in the server (using gcm-http.googleapis.com/gcm/ vs. fcm.googleapis.com/fcm/request in one server?)

I still doubt to migrating GCM to FCM, so I need some ideas from you all guys and I think send a notification from FCM console is not scalable for me because of too many notifications that triggered by user activities. Thanks

Community
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Bambang
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As much as I have understood from reading various documents and watching youtube recordings of 2016 I/O, FCM appears to be rebranded GCM. Server side integration will stay the same with option to switch endpoint domain name. When look a little closer you see that both domain names are referring to same IP address.

From client side integration much more has changes. FCM has a new SDK which makes certain things little easier to manage. Not sure if there are any improvements in terms of keeping app connected to the backend, listening incoming messages.

Martin Koppel
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