fun subscribeToPresences(contacts: List<Contact>, onCompletion: (Either<List<Presence>, SippoResourceError>) -> Unit): Unit
Subscribes to the presence of each contact included in contacts.
contacts
- Contact list to subscribe to.
onCompletion
- Callback that will be invoked when the request is completed.
It will receive the presence list in case of success or a SippoResourceError otherwise.