Use this method to probe for another entity's presence.
async xmpp.probePresence(jabberId : string): Promise<void>
In the case that the user needs to update a particular entity's presence this method can be used to retrieve it. After a successful call, the server will either respond with the last known presence for Jabber, or will send a presence element of type "error". In either case, the respond will be returned by a Presence event.