Internet of Things power system

An Internet of Things (IoT) power system includes a cloud layer, a channel layer, an edge layer and a terminal layer arranged in sequence from top to bottom. A device mapping set is set in advance for each type of terminal device, an IoT edge agent converts, based on the device mapping set, original power data from terminal device(s) 40 into intermediate power data and sends it to a management platform 20 which may correctly read and understand the intermediate power data and based on the device mapping set form service data in a format required by a service platform(s) 10 so that the multiple service platforms share power data collected once by the terminal device. Terminal devices may request access to the IoT system via the edge device and provide a parameter as part of the request. If the parameter supplied is unreadable the edge device is configured to obtain a readable parameter from the terminal and supply the readable unique parameter and the access request to the management platform. The management platform in considering the request determines whether the unreadable parameter is valid and also whether the readable parameter conflicts with that of another terminal device.