说明：  本书是介绍OPNET工具支持物联网研究的书，并且介绍了物联网的各种版本，包括以人为中心的物联网、绿色物联网、窄带物联网、智能物联网、物联网云集成，提供了OPNET物联网仿真代码，并对模型的功能进行了详细的说明。
(This book introduces OPNET tools to support the Internet of things research, and introduces various versions of the Internet of things, including people-centered Internet of things, green Internet of things, narrowband Internet of things, intelligent Internet of things, cloud integration of the Internet of things, provides OPNET Internet of things simulation code, and describes the function of the model in detail.)