Set RGB Value of LED
Function:

Description: Set RGB value of LED
Parameter:
- port: controller port. data type: int, range: port1~port6
- position of light: data type: int, range: 1~3
- R: brightness value of red. data type: int, range: 0~255
- G: brightness value of green. data type: int, range: 0~255
- B: brightness value of blue. data type: int, range: 0~255
- Return: null