Update mqttd hal code, can control relay now

Guo Wenxue

2019-06-27 b64d6ff04401ed85fce543b8e20c8c360fb284f5

 mqttd/hal/hal.h

@@ -14,9 +14,12 @@
#ifndef  _HAL_H_
#define  _HAL_H_

#include <wiringPi.h>

#include "lylib/logger.h"

#include "led.h"
#include "relay.h"
#include "ds18b20.h"
#include "sht20.h"