How to use socket?

[Yusuke]

<Environment>
- Windows10
- nrf v1.3.0
- modem fw 1.2.0

I'm attempting to make a socket and communicate with the modem using it.

However, sending data doesn't work out. It was working in v1.2.0. Any tip?

I don't want to use at_cmd.c becuase I need a exclusive  socket for SMS notification.

<main.c>

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#include <zephyr.h>

#include <stdio.h>

#include <net/socket.h>

#include <modem/lte_lc.h>

#define BUF_LEN 128

int fd;

void main(){

int ret;

char at_cmd[] = "AT\n";

char buf[BUF_LEN];

/* Configure LTE-M */

printk("LTE Link Connecting ...\n");

ret = lte_lc_init_and_connect();

printk("LTE Link Connected!\n");

if (ret) {

printk("Error: modem_configure\n");

return;

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

#include <zephyr.h>
#include <stdio.h>
#include <net/socket.h>
#include <modem/lte_lc.h>

#define BUF_LEN 128

int fd;

void main(){
    int ret;
    char at_cmd[] = "AT\n";
    char buf[BUF_LEN];
    
	/* Configure LTE-M */
    printk("LTE Link Connecting ...\n");
    ret = lte_lc_init_and_connect();
    printk("LTE Link Connected!\n");
	if (ret) {
		printk("Error: modem_configure\n");
		return;
	}

	/* SMS socket set up*/
	fd = socket(AF_LTE, 0, NPROTO_AT); /* init fd */
	if (fd == -1) {
		return;
	}

	// Send AT command => ERROR !!
	if (send(fd, at_cmd, strlen(at_cmd), 0) <= 0) {
        printk("Error: send\n");
        return;
    }

	// blocking receive
	if (recv(fd, buf, BUF_LEN, MSG_DONTWAIT) <= 0) {
        printk("Error: send\n");
        return;
    }

    printk("Socket works out!\n");
    
    return;
}