nef9160 IMEI

[ephraim]

Dear Sir,

Moving to zephyr new installation 1.4.99  

The code of getting the IMEI number no longer works.

Modem firmware is mfw_nrf9160_1.2.3

reply_buf_len = at_exec_reply("AT+CGSN=1", 9, &reply_buf[0], 30);

Am I missing something ?.

Is there any example ?.

 

Please Advise

[Albrecht Markus Schellenberger]

Hello Ephraim,

I assume that you are using Zephyr 2.4.99.

Function “at_exec_reply”, is that something you wrote yourself?

Can you elaborate “no longer works”? Does the application still compile?

Regards,

Markus

[ephraim]

Hi.

This is the code 

void GetIMEI(void)
{
int reply_buf_len;

reply_buf_len = at_exec_reply("AT+CGSN=1", 9, &reply_buf[0], 30);//NTP_GET_CURR_UNIX_TIME_MAX_REPLY_LEN)

memcpy(&imei_buf[0] , &reply_buf[8] ,15);
// imei_buf[15] = NULL;
imei_buf[15] = 0x2f;
imei_buf[16] = 0x53;
imei_buf[17] = 0x54;
imei_buf[18] = NULL;
}

It worked before .

Now I get the error   [at_exec_reply:59] ERROR: AT commands socket error.

Please Advise

[Albrecht Markus Schellenberger]

Thanks for the code snippet, Ephraim!

However, I can’t find any information about the function “at_exec_reply”. What does it do?

Regards,

Markus

[ephraim]

Hi.

in Main I issue the command   GetIMEI();

Attached some code 

Fullscreen at.c Download

#include "at.h"

#include <zephyr.h>
#include <stdio.h>
#include <string.h>
//#include <zephyr.h>
#include <nrf_socket.h>
#include <net/socket.h>


int at_exec(char * at_command, int at_command_strlen) 
{
	int  at_sock;
	int  bytes_sent;
	int  bytes_received;
	char buf[2];
	int ret = 0;

	at_sock = socket(AF_LTE, 0, NPROTO_AT);
	if (at_sock < 0)
	{
		printk("[%s:%d] ERROR: AT commands socket error.\n", __func__, __LINE__);
                return -1;
	}

	bytes_sent = send(at_sock, at_command, at_command_strlen, 0);
	
	if (bytes_sent < 0)
	{
		close(at_sock);
		return -1;
	}
		
	do
	{
		bytes_received = recv(at_sock, buf, 2, 0);
	} while (bytes_received == 0);
	
	if (memcmp(buf, "OK", 2) != 0)
		ret = -1;
	
	close(at_sock);	
	return ret;
}

/*
	out_reply_str - an allocated string of length out_reply_str_len
*/
int at_exec_reply(char * at_command, int at_command_strlen, char * out_reply_str, int out_reply_str_len) 
{
	int  at_sock;
	int  bytes_sent;
	int  bytes_received;
	int ret = 0;

	at_sock = socket(AF_LTE, 0, NPROTO_AT);
	if (at_sock < 0)
	{
		printk("[%s:%d] ERROR: AT commands socket error.\n", __func__, __LINE__);
		return -1;
	}

	bytes_sent = send(at_sock, at_command, at_command_strlen, 0);
	
	if (bytes_sent < 0)
	{
		close(at_sock);
		return -1;
	}
		
	do
	{
		bytes_received = recv(at_sock, out_reply_str, out_reply_str_len, 0);
	} while (bytes_received == 0);
	ret = bytes_received;
	
	close(at_sock);	
	return ret;
}

The line at_sock = socket(AF_LTE, 0, NPROTO_AT);   in at.c return false.

Is there another way to get the IMEI number within the code ?.

Bye.

[Albrecht Markus Schellenberger]

A good way to find out a little bit more about why the socket function returns false, is to print errno. Would you mind doing that?

Otherwise, there are two alternatives to get the IMEI:

1. AT command interface library using the function at_cmd_write instead of socket. https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.5.0/nrf/include/modem/at_cmd.html#
2. Modem interface library using the function modem_info_short_get instead of socket, for instance. https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.5.0/nrf/include/modem/modem_info.html

Cheers!

Markus