Add remote LED on/off control to sensor tag application
Add remote LED on/off control to sensor tag application

1.add API app_led_control to app.c
2.send message type:0x00,length:0x01,data:0x00(LED off)/0x01(LED on)
from phone to cannon to control cannon led on/off.

196510921/STM32_Platform,cannonrobot/Balance_Car_STM32,JUMA-IO/STM32_Platform,JUMA-IO/STM32_Platform,cannonrobot/Balance_Car_STM32,JUMA-IO/STM32_Platform,196510921/STM32_Platform,cannonrobot/Balance_Car_STM32