title: how to test MQTT server in ubuntu?
body: <p>I have installed the MQTT server 'mosquitto' in my ubuntu machine by following the instructions in this link <a href="https://lukeisadog.wordpress.com/2014/02/27/setting-up-mqtt-on-ubuntu-round-1/" rel="nofollow">https://lukeisadog.wordpress.com/2014/02/27/setting-up-mqtt-on-ubuntu-round-1/</a> . But I am not able to test the server. When I type <code>mosquitto</code> in command prompt I am getting below error.</p>
  
  <pre><code> 1431416111: mosquitto version 1.4.2 (build date 2015-05-09  21:39:32+0000) starting
   1431416111: Using default config.
   1431416111: Opening ipv4 listen socket on port 1883.
  1431416111: Error: Address already in use
  </code></pre>
  
  <p>when i type <code>mosquitto –daemon –verbose</code> I am getting error like "Unknown option '–daemon'".
  Please help me on this. </p>