mod_ignore_host_chatstates: Discard chat state messages sent to a bare host Prevents annoying error replies to be sent in reply to such empty chat state messages. Useful in combination with modules that handle messages to a host.

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);