Fecha de publicación: 15/12/2023 Fuente: Wipo "IOT" The invention relates to a method for communication of an IoT node (110) in a local network (100), which is connected to the Internet (200) only via a computer (130). The local network (100) has an Ethernet network or a single pair Ethernet network. The IoT node is configured without a display and without an operating element and has a first interface for communicating with other IoT nodes in a local network (120). Each IoT node has a first public key and a first private key. The first private key is stored in advance or generated by the IoT node itself. Authentication of the IoT node is performed by sending, by the computer, a request for a root certificate to a root certificate server (210) having at least one root certificate of an IoT manufacturer, by receiving and storing the root certificate, and by checking, from the received root certificate, whether the IoT node is an original and unchanged device. A root certificate (Z) links a first public key of the IoT node with unique address information of the IoT node that is valid only in the local network. The computer checks, from the stored root certificate (Z), whether the public key of the IoT node is signed by the manufacturer of the IoT node. The first key is checked based on an encryption method.