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Updated 14 December 2016
“GCM topic messaging allows your app server to send a message to multiple devices that have opted into a particular topic.”
Based on the publish/subscribe model, topic messaging supports unlimited subscriptions per app.
The app server sends messages with payloads up to 2KB to the topic.
GCM introduces topic messaging, a way of sending messages to many clients.
An application can create one or more topics and register clients to each topic. Then messages are sent for a specific topic, GCM informing all clients who have been registered for it. This way one can reach a large number of clients, even all of them.
Developers can choose any topic name that matches the regular expression, "/topics/[a-zA-Z0-9-_.~%]+"
GCM topic is very similar to sending messages to an individual device.
The app server sets to with /topics/yourTopicMessage
We can send data messages to a topic by HTTP and XMPP protocols.
Expect up to 30 seconds of delay before the GCM Connection Server returns a success or failure response to the topic send requests.
To subscribe to a topic, the client app calls GCM PubSub subscribe() with the GCM registration token and topic name.
The GCMReceiver and GCMListenerService services is simplify use for message handling on Android client apps.
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