Set colour of an rgb bulb.

        Args:
            r(int): Value for the colour red as int from 0-255.
            g(int): Value for the colour green as int from 0-255.
            b(int): Value for the colour blue as int from 0-255.

def set_colour(self, r, g, b):
        """
        Set colour of an rgb bulb.

        Args:
            r(int): Value for the colour red as int from 0-255.
            g(int): Value for the colour green as int from 0-255.
            b(int): Value for the colour blue as int from 0-255.
        """
        if not 0 <= r <= 255:
            raise ValueError("The value for red needs to be between 0 and 255.")
        if not 0 <= g <= 255:
            raise ValueError("The value for green needs to be between 0 and 255.")
        if not 0 <= b <= 255:
            raise ValueError("The value for blue needs to be between 0 and 255.")

        #print(BulbDevice)
        hexvalue = BulbDevice._rgb_to_hexvalue(r, g, b)

        payload = self.generate_payload(SET, {
            self.DPS_INDEX_MODE: self.DPS_MODE_COLOUR,
            self.DPS_INDEX_COLOUR: hexvalue})
        data = self._send_receive(payload)
        return data