However they do seem to offer custom firmware services at https://ncd.io/custom-iot-electronic-design-services-hardware-firmware/
Time to contact them to see how much to get this done.
Hello I am looking for some sample code to connect the TCP/IP extension board https://store.ncd.io/product/ethernet-internet-contact-closure-remote-high-power-relay-controller-4-channel-1-way/ through Raspberry PI and want to configure in such way that we can't control the board remotely through wired network any leads to make this kind of process functional will be very helpful

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