Fig. 6
From: An access control model for the Internet of Things based on zero-knowledge token and blockchain
Physical drawing of the development board. The test equipment has two desktop computers, three laptops, one IoT gateway development board, and two Wi-Fi development boards. The laptop, as the access host device, initiates the resource applies to the object while maintaining the private blockchain network together with the desktop. WiFi development board simulates IoT terminal devices and selects the IoT gateway as a proxy to implement access control. Install ethereum Geth client on two desktops, three laptops, and the IoT gateway development board to convert to ethereum node and join the same private blockchain by configuration. The IoT gateway development board compacts the smart contract for testing through the Remix integrated development environment, and the ethereum node is interactively tested with the Geth client through Web3J