subscribe
fun subscribeToPresencesBy(userUris: List<String>, onCompletion: (Either<List<Presence>, SippoResourceError>) -> Unit)
Subscribes to the presence of each contact included in userUris.
Parameters
user
The UserUri list to subscribe to.
on
Callback that will be invoked when the request is completed. It will receive the presence list in case of success or a SippoResourceError otherwise.