xmpp ejabberd - query for user presence -

is there way query user presence in xmpp, given user's subscription type 'both'?

since building mobile platform, have blocked incoming presence stanzas using privacy list. in use case, user @ least subscribed 500 users , processing these many presence stanzas put lot of stress on mobile device.

so instead of processing user stanzas, presence user when query it.

there no such feature @ moment inside ejabberd, that's can develop plugin. can write plugin handling http requests using http webserver , whatever processing , security check want before answering user presence.