muc_notifications: notify non-present members of new messages This module, in the event of a new message in a Group Chat, will generate a notification for each of those members not present at that time in the Group Chat

module:hook("message/host", function (event)
	local stanza = event.stanza;
	if #stanza.tags == 1 and stanza.tags[1].attr.xmlns == "http://jabber.org/protocol/chatstates" then
		return true;
	end
end, -10);