n> (argc &gt; 3) {</div><div class="line">        port = argv[3];</div><div class="line">    } <span class="keywordflow">else</span> {</div><div class="line">        port = <span class="stringliteral">&quot;8883&quot;</span>;</div><div class="line">    }</div><div class="line"></div><div class="line">    <span class="comment">/* get the topic name to publish */</span></div><div class="line">    <span class="keywordflow">if</span> (argc &gt; 4) {</div><div class="line">        topic = argv[4];</div><div clas