Add mqtt folder in iotd

guowenxue

2021-04-20 b5bf869dfb976503ec146d79b588eeff61f13e50

 iotd/hal/gpio.h

@@ -25,7 +25,7 @@
typedef struct gpio_info_s
{
    char                 name[32];      /*  GPIO connected module name */
    int                  pins;          /*  GPIO BCM pin number */
    int                  pin;          /*  GPIO BCM pin number */
    int                  active_level;  /*  active power level */
    struct gpiod_line   *lines;         /*  gpiod lines */
} gpio_info_t;