Send SETCOLOR message.

def set_color(self, ipaddr, hue, sat, bri, kel, fade):
        """ Send SETCOLOR message. """
        cmd = {"payloadtype": PayloadType.SETCOLOR,
               "target": ipaddr,
               "hue": hue,
               "sat": sat,
               "bri": bri,
               "kel": kel,
               "fade": fade}

        self._send_command(cmd)