code: func (b *BlinkMDriver) Rgb(red byte, green byte, blue byte) (err error) {
  	if _, err = b.connection.Write([]byte("n")); err != nil {
  		return
  	}
  	_, err = b.connection.Write([]byte{red, green, blue})
  	return
  }
docs: // Rgb sets color using r,g,b params