Automatic real-time detection of device and user state to identify who and what is connected.

Presence, powered by PubNub DSN, keeps a finger on the pulse, delivering up-to-the-millisecond status of users and devices. Beyond simply reading who is online and offline, Presence is flexible, enabling the streaming of real-time updates as device state changes (like typing indicators, whether a door is open or closed, and other sensor information). And, act on status updates by triggering PubNub Functions whenever an event occurs.

What Can You Do with Presence?

Online/Offline Status

Signal other devices and servers as each user/device connects and disconnects.

Custom Status Changes

Stream real-time updates as device state changes, like typing notices, battery drain, or temperature.

Trigger Functions and 3rd Party Services

Trigger PubNub Functions whenever a presence event occurs, or webhooks on any presence join/leave event.

Actionable Updates

Pass customized information about the device for its last known state.

How It Works: Code Example

JavaScript
Android/Java
iOS
.Net

pubnub.addListener({
presence: function(presenceEvent) {
console.log('presence event came in: ', presenceEvent)
}
});
pubnub.subscribe({ channels: ['ChatRoomChannel'],withPresence: true });

pubnub.addListener(new SubscribeCallback() {
@Override
public void presence(PubNub pubnub, PNPresenceEventResult presence) {
System.out.println(presence);
}
});
pubnub.subscribe().channels(Arrays.asList("ChatRoomChannel")).withPresence().execute();

class Listener: NSObject, PNObjectEventListener {
func client(_client: PubNub, didReceivePresenceEvent event: PNPresenceEventResult) {
print("Received presence event!!! \(event.debugDescription)")
}
}
let myListener = Listener()
client.addListener(myListener)
client.subscribeToChannels(["ChatRoomChannel"], withPresence: true)