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FCM uses XMPP https://firebase.google.com/docs/cloud-messaging/xmpp-server-ref https://firebase.google.com/docs/cloud-messaging/xmpp-server... I really like t

FCM uses XMPP https://firebase.google.com/docs/cloud-messaging/xmpp-server-ref https://firebase.google.com/docs/cloud-messaging/xmpp-server... I really like the idea of Google providing a single, efficient connection for push-notifications, but having it bundled with Firebase (and therefore with Google Play Services) is an unfriendly approach.

damian2000 8y ago
XMPP is only one option for communicating with the FCM server. The most popular method is using HTTP/REST. XMPP is only needed when you have bidirectional messages - server to client app (downstream) and client app to server (upstream).