Hello, I am building a robot and I need to have a onboard network that I can connect to from my laptop via WiFi, but I also have a computer onboard the robot and I would like to have it connected with Ethernet. A small portable router will be on the robot, and im using a TP-Link TL-WR902AC flashed with OpenWrt, but it only has one Ethernet interface. So I want to use the Ethernet interface only as a LAN port that is on the same network as the wireless. I dont need any connection to WAN, so it will operate only on a local network. How can I configure this on OpenWrt?