title: How to stop Mosquitto service running under macOS Big Sur
body: <p>Under macOS Big Sur I started a Mosquitto broker service from the command line:</p>
  <pre><code>/usr/local/sbin/mosquitto -c /usr/local/etc/mosquitto/mosquitto.conf
  </code></pre>
  <p>Now I would like to change the <code>mosquito.conf</code> file and check for changes.</p>
  <p>My issue is that if I execute the same command again, I get the following status messages:</p>
  <pre><code>1615884201: mosquitto version 2.0.9 starting
  1615884201: Config loaded from /usr/local/etc/mosquitto/mosquitto.conf.
  1615884201: Opening ipv6 listen socket on port 1883.
  1615884201: Opening ipv4 listen socket on port 1883.
  1615884201: Opening ipv4 listen socket on port 1883.
  1615884201: Error: Address already in use
  </code></pre>
  <p>Furthermore, I cannot see any mosquitto service (e.g. by <code>ps aux | grep mosquitto</code>).</p>
  <p>Where is the process hidden and how do I stop it?</p>