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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 messa

by 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).