[Standards] Receiving a pong signal from an offline JID

Good day. I am working on a news service for XMPP, which sends messages according to status. When JID is offline, service should stop. Resources --------- As XMPP is presence oriented, it is needed to set extra measures, such as collecting detected resources, in order to be certain that a subject JID is indeed offline. This measure is still tested. Signals ------- I am experimenting with XEP-0199: XMPP Ping as a possible mean to confirm that an account is offline. However, while asking for a pong signal from a full JID (JID with a resource) returns an empty respond, asking for a pong signal appear to always to work when querying a bare JID (JID without a resource). PONG: sch(a)pimux.de/gajim.TN7Y65AS None PONG: sch(a)pimux.de 0.09115195274353027 PONG: sch(a)pimux.de/gajim.TN7Y65AS None PONG: sch(a)pimux.de 0.10207772254943848 My expectation was to have no respond for bare JID, when there is no connected instance to a given JID. Please advise. Kind reagrds, Schimon