To enable presence during the beta, please send an email to support@pubnub.com with the subscribe key(s) on which you would like to track presence. When the feature is out of beta, customers will be able to manage presence configuration from the account portal on a per-key basis.
Presence data is not stored for long-term history by default, but we can enable this on request.
For unique clients to be tracked, a UUID should be included with each /subscribe request. The UUID may, in fact, be any string value such as a user name or user ID, but the default string generated by PubNub's client libraries follow the uuid4 spec resembling c05cca54-45ab-49d3-861b-d50fe2be9304. It is recommended the client cache the UUID so that it is consistently used on reconnection. Clients that do not include a UUID will not be counted in presence stats. Do not share this UUID between clients or presence will have inconsistent behavior.