ker">Broker</a> auth -&gt; <a href="Network-MQTT-Message.html#t:Message">Message</a> -&gt; <a href="../base-4.9.0.0/System-IO.html#t:IO">IO</a> () <a href="src/Network.MQTT.Broker.html#publishUpstream%27" class="link">Source</a> <a href="#v:publishUpstream-39-" class="selflink">#</a></p></div><div class="top"><p class="src"><a id="v:subscribe" class="def">subscribe</a> :: <a href="Network-MQTT-Authentication.html#t:Authenticator">Authenticator</a> auth =&gt; <a href="Network-MQTT-Broker.html#t:Broker">Broke