Connecting two KC868-A8 together

[msinfo]

Hello, i have a strange case here. I am running ESPhome with the KC868-A8 board with Ethernet and i want to use a second KC868 board. On the second board the ethernet port is not working and i don't have access to a WiFi signal. Is there a way to communicate with the first board and send and receive data without connecting it to wifi or ethernet ?

Thanks