The smart IoT platform integrates unified device access, unified message communication, unified device management, unified system management and other capabilities, supports multiple standard protocols for unified device access, ensures secure data communication, and decouples devices and applications through object models and device shadow caching mechanisms, to provide full-scenario IoT services such as alarms, work orders, timing insights, and scene linkage to achieve complete device life cycle management and build an intelligent world where everything is interconnected and humans and machines collaborate.