Internet of things system, central control device, application device and communication methods

An Internet of Things system comprising a central control device and a plurality of application devices, wherein

• the central control device comprises:
• a central control processor configured to perform a central control function of the central control device based on a first clock signal;
• a first asynchronous circuit configured to perform data communication between the central control device and the plurality of application devices;
• a first synchronous-asynchronous interface configured to perform data transmission between the central control processor and the first asynchronous circuit,
• each application device comprises:
• an application control processor configured to perform an application function of the application device based on a second clock signal;
• a second asynchronous circuit configured to perform data communication between the application device and the central control device for the Internet of Things;
• a second synchronous-asynchronous interface configured to perform data transmission between the application control processor and the second asynchronous circuit.