idden="true">9.2.5.</strong> Setting Up MQTT Broker on Linux and Windows</a></li><li class="chapter-item expanded "><a href="../../chapter_9/9.2/9.2.6.html"><strong aria-hidden="true">9.2.6.</strong> Setting Up MQTT Client Based on ESP-IDF</a></li></ol></li><li class="chapter-item expanded "><a href="../../chapter_9/9.3/index.html"><strong aria-hidden="true">9.3.</strong> Ensuring MQTT Data Security</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../chapter_9/9.3/9.3.1.html"><