Most people don`t know that the Wii remote control communicates with the Wii via a Bluetooth wireless link. The Bluetooth controller is a Broadcom 2042 chip, which is designed to be used with devices which follow the Bluetooth Human Interface Device (HID) standard, such as keyboards and mice. The Bluetooth HID is directly based upon the USB HID standard, and much of the same documentation applies. More specific: I need a Bluetooth connection to my robot first.

Or a cable or https://blog.arduino.cc/category/controllers/wiimote/