Lightkey not recognised, not lighting up

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I recommend USB Ethernet instead of wifi.

For checking you could use the Arduino IDE with its serial console with my fork of the keypad https://github.com/Mihaylov93/Keypad

You would need to set the debug flag to 1 (true) https://github.com/Mihaylov93/Keypad/blob/master/clockworkpi_keypad.ino#L7 so you can get the keypresses on the serial console.