Why failed to set apn?

RE: Why failed to set apn?

Øyvind — Fri, 26 Nov 2021 09:26:10 GMT

Hi,

we will need to look at the modem trace. Please follow this guide.

Kind regards,
Øyvind

RE: Why failed to set apn?

duxinglang — Thu, 25 Nov 2021 09:21:31 GMT

thanks for your reply!

I tried to get the reason why the at function failed, the return is -8, it means:

#define ENOEXEC 8 /* Exec format error */

However, when I used another esIM card from another carrier that could not connect to the local network, I tried to set up apN and it showed success, which is very strange!

RE: Why failed to set apn?

Øyvind — Thu, 25 Nov 2021 08:05:53 GMT

Hello,

Yes, this is true if successful but what about any error code returned from modem? From the Asset Tracker of nRF Connect SDK v1.2.0

#if defined(CONFIG_AT_CMD)
		err = at_cmd_write(modem_at_cmd_buff, modem_at_cmd_buff,
				sizeof(modem_at_cmd_buff), &state);
#else
		/* Proper error msg has already been copied to buffer */
		err = 0;
#endif
	}

	/* Get response length; same buffer was used for the response. */
	len = strlen(modem_at_cmd_buff);

	if (err) {
		len = snprintf(modem_at_cmd_buff, sizeof(modem_at_cmd_buff),
				"AT CMD error: %d, state %d", err, state);
	} else if (len == 0) {
		len = snprintf(modem_at_cmd_buff, sizeof(modem_at_cmd_buff),
				"OK\r\n");
	} else if (len > MODEM_AT_CMD_MAX_RESPONSE_LEN) {
		len = snprintf(modem_at_cmd_buff, sizeof(modem_at_cmd_buff),
				MODEM_AT_CMD_RESP_TOO_BIG_STR);
	}

Please verify no error is received from modem.

Kind regards,
Øyvind

RE: Why failed to set apn?

duxinglang — Thu, 25 Nov 2021 03:04:01 GMT

HI，I am currently using ncs1.2.0, and the version of modem fw is also 1.2.0. at_cmd_write() function returns 0 to indicate that it has been executed correctly.

RE: Why failed to set apn?

Øyvind — Wed, 24 Nov 2021 13:58:43 GMT

Hello,

How are you handling the return value of the at_cmd_write() function? What version of nRF Connect SDK are you working on? What modem FW are you running?

Please note that we do have a PDN library in our latest NCS tag v1.7.1.

Kind regards,
Øyvind