An Internet of Things (IoT) smart home/building automation system (IoT smart system) that blocks network standby power is disclosed, and the system connects to an IoT smart system platform and an external network over the cloud A hub function and control function, including at least a wired/wireless power transmitter, a power supply/disconnect module, a power switch, and a communication module, which is a means for supplying wake-up power to a gateway or router, power supply, and various IoT devices for operation Master to perform; Connect IoT devices in a state where network standby power is cut off by connecting to a smart outlet (one or multiple outlets) that is connected to an existing power outlet, and receive wake-up power from the master to provide wake-up power to the IoT device. Smart multi-outlet that supplies; IoT devices having a configuration to block the network standby power and standby power of the device itself and IoT devices to always supply power; IoT devices including at least one sensor operated by a battery; and a non-IoT smart outlet configured to connect non-IoT devices to the system.
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