title: eclipse mosquitto - Client <unknown> disconnected due to malformed packet
body: <p>Testing out Eclipse Mosquitto (2.0.14)</p>
  <p>mosquitto.conf</p>
  <pre><code>listener 8883
  allow_anonymous true
  </code></pre>
  <p>docker-compose.yml</p>
  <pre><code>services:
    mosquitto:
      image: eclipse-mosquitto
      container_name: mosquitto
      ports:
        - 8883:8883
      volumes:
        - ./mosquitto.conf:/mosquitto/config/mosquitto.conf
        - ./data:/mosquitto/data
  </code></pre>
  <p>Testing like this (from inside the container):</p>
  <pre><code>mosquitto_pub -h 127.0.0.1 -p 8883  -m &quot;test&quot; -t test
  </code></pre>
  <p>results in</p>
  <pre><code>Client &lt;unknown&gt; disconnected due to malformed packet.
  </code></pre>
  <p>Any ideas?</p>