subscribe
fun subscribeToExternalContactPresence(contactId: String, onUpdate: (Either<ExternalPresence, SippoResourceError>) -> Unit): ExternalPresenceSubscription
Subscribes to external presence updates for the specified contact.
Return
Subscription that can be used to stop receiving updates.
Parameters
contact
Contact identifier whose external presence is requested.
on
Callback invoked with external presence updates or a terminal SippoResourceError.