Aiming at the development status of the Internet of Things, the system architecture of the mainstream Internet of Things is analyzed, and the technical characteristics of the interconnection for different levels are given based on the communication protocols. The access layer and application layer are analyzed for the feasibility of interconnection technology. Especially for the detailed decomposition of application layer protocol, the application of interconnection is analyzed in the industry. The implementation method and future development direction of protocol interconnection are proposed.
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