Send AT commands on button press on nRF9160dk

Question

Hello,

I have to send hardcoded AT commands on button press on nRF9160dk. So for that, first I did program for button press. It is working fine. Then I did simple_at program, which is also working fine. So now I have merged these 2 programs. But it is not working.

I have pasted the code. In the interrupt callback function button_pressed, all other functions are working, except app_socket_start. It stucks inside callback function. when I call app_socket_start function in main, it is working fine, but get stucked when I call inside the callbak function. What is the solution for this?

#include <net/socket.h>
#include <stdio.h>
#include <string.h>
#include <uart.h>
#include <gpio.h>
#include <device.h>
#include <zephyr.h>
#include <misc/util.h>
#include <misc/printk.h>

#define HTTP_HOST "google.com"
#define HTTP_PORT 80
#define RECV_BUF_SIZE 1024

char recv_buf[RECV_BUF_SIZE + 1];

#define LED_PORT LED1_GPIO_CONTROLLER
#define LED	LED1_GPIO_PIN

/* change this to use another GPIO port */
#ifndef SW1_GPIO_CONTROLLER
#ifdef SW1_GPIO_NAME
#define SW1_GPIO_CONTROLLER SW1_GPIO_NAME
#else
#error SW1_GPIO_NAME or SW1_GPIO_CONTROLLER needs to be set in board.h
#endif
#endif
#define PORT	SW1_GPIO_CONTROLLER

/* change this to use another GPIO pin */
#ifdef SW1_GPIO_PIN
#define PIN     SW1_GPIO_PIN
#else
#error SW1_GPIO_PIN needs to be set in board.h
#endif

/* change to use another GPIO pin interrupt config */
#ifdef SW1_GPIO_FLAGS
#define EDGE    (SW1_GPIO_FLAGS | GPIO_INT_EDGE)
#else
/*
 * If SW0_GPIO_FLAGS not defined used default EDGE value.
 * Change this to use a different interrupt trigger
 */
#define EDGE    (GPIO_INT_EDGE | GPIO_INT_ACTIVE_LOW)
#endif

/* change this to enable pull-up/pull-down */
#ifndef SW1_GPIO_FLAGS
#ifdef SW1_GPIO_PIN_PUD
#define SW1_GPIO_FLAGS SW1_GPIO_PIN_PUD
#else
#define SW1_GPIO_FLAGS 0
#endif
#endif
#define PULL_UP SW1_GPIO_FLAGS

/* Sleep time */
#define SLEEP_TIME	500

const char *at_commands[] = {
	"AT+CFUN?", "AT+CFUN=1", "AT+CFUN?", "AT+CEREG?",
	"AT+CNMI=3,2,0,1", 
        "AT+CMGS=19\r07913386094000F011000B913367390898F80000AA05C8329BFD06\x1A",
	/* Add more here if needed */
};

int blocking_recv(int fd, u8_t *buf, u32_t size, u32_t flags)
{
	int err;

	do {
		err = recv(fd, buf, size, flags);
	} while (err < 0 && errno == EAGAIN);

	return err;
}

int blocking_send(int fd, u8_t *buf, u32_t size, u32_t flags)
{
	int err;

	do {
		err = send(fd, buf, size, flags);
	} while (err < 0 && errno == EAGAIN);

	return err;
}

int blocking_connect(int fd, struct sockaddr *local_addr, socklen_t len)
{
	int err;

	do {
		err = connect(fd, local_addr, len);
	} while (err < 0 && errno == EAGAIN);

	return err;
}

void app_socket_start(void)
{
	int at_socket_fd = socket(AF_LTE, 0, NPROTO_AT);

	printk("Starting simple AT socket application\n\r");

	if (at_socket_fd < 0) {
		printk("Socket err: %d, errno: %d\r\n", at_socket_fd, errno);
	}
	for (int i = 0; i < ARRAY_SIZE(at_commands); i++) {
		int bytes_written = send(at_socket_fd, at_commands[i],
					 strlen(at_commands[i]), 0);
		if (bytes_written > 0) {
			int r_bytes =
				blocking_recv(at_socket_fd, recv_buf,
					      sizeof(recv_buf), MSG_DONTWAIT);
			if (r_bytes > 0) {
				printk("%s", recv_buf);
			}
		}
	}
	printk("Closing socket\n\r");
	(void)close(at_socket_fd);
}


void button_pressed(struct device *gpiob, struct gpio_callback *cb,
		    u32_t pins)
{
        printk("Button pressed\n");
        app_socket_start();
        struct device *dev;

	dev = device_get_binding(LED_PORT);
        gpio_pin_configure(dev, LED, GPIO_DIR_OUT);

        u32_t val = 0U;
        gpio_pin_read(gpiob, PIN, &val);

        if(val == 0)
        {
            gpio_pin_write(dev, LED, 1);
        }
        else if(val == 1)
        {
            gpio_pin_write(dev, LED, 0);
        }
//        app_socket_start();
}


static struct gpio_callback gpio_cb;

void main(void)
{
      
	struct device *gpiob;
	printk("Press the user defined button on the board\n");
	gpiob = device_get_binding(PORT);
	if (!gpiob) {
		printk("error\n");
		return;
	}


	gpio_pin_configure(gpiob, PIN,
			   GPIO_DIR_IN | GPIO_INT |  PULL_UP | EDGE | GPIO_INT_DOUBLE_EDGE | GPIO_INT_DEBOUNCE);

	gpio_init_callback(&gpio_cb, button_pressed, BIT(PIN));

	gpio_add_callback(gpiob, &gpio_cb);
	gpio_pin_enable_callback(gpiob, PIN);
}