<p>➀ IoT gateways act as intermediaries, enabling communication between diverse IoT devices and the cloud by translating protocols like Zigbee and BLE;</p><p>➁ A case study showcases vibration monitoring in airport elevators using BLE-connected sensors and IoT gateways to bypass Wi-Fi restrictions;</p><p>➂ Gateways provide local data storage, secure cloud transmission, and Over-The-Air updates, enhancing operational efficiency and compliance.</p>