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          <td>(</td>
          <td class="paramtype">const <a class="el" href="struct_m_q_t_t_properties.html">MQTTProperties</a> *</td>          <td class="paramname"><span class="paramname"><em>props</em></span></td><td>)</td>
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<p>Returns the length of the properties structure when serialized ready for network transmission. </p><dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">p