ier</a> -&gt; [(<a href="Network-MQTT-Topic.html#t:Filter">Filter</a>, <a href="Network-MQTT-Message.html#t:QualityOfService">QualityOfService</a>)] -&gt; <a href="../base-4.9.0.0/System-IO.html#t:IO">IO</a> ()</li><li class="src short"><a href="#v:unsubscribe">unsubscribe</a> :: <a href="Network-MQTT-Broker.html#t:Broker">Broker</a> auth -&gt; <a href="Network-MQTT-Session.html#t:Session">Session</a> auth -&gt; <a href="Network-MQTT-Message.html#t:PacketIdentifier">PacketIdentifier</a> -&gt; [<a href="Netw