Is it possible to set different host IP Address for each terminal?

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I connect the sensor hardware with the PC through a Switch. And then connect PC with Nao-robot through wifi, robot as an AP. They work fine, when I connect them separately. The things is, when I try to use the sensor and robot together, it takes the Ethernet host Address as default and the robot doesn't work. Is it possible to set different IP address for different terminals, or should I write code in script which IP to use？