set APN

Question

I'm new to develop firmware on nRF9160-DK, and my first target to add APN to use LTE-M.

For now, I'd like to do a simple way in the below even this is temporary.

=> Hard-code in code. Have to re-build if APN needs tp be changed.

I've added the code to run the following at the beginning of main in 'mqtt_simple' to add APN.

>>if (at_cmd_write('AT+CGDCONT=1,"IP","isp.telus.com"', NULL, 0, NULL) != 0) {
>> LOG_INF("Failed AT+CGDCONT");
>>}

But it looked failing somehow because I didn't see the following message without my code in mqtt_simple.

Could you let me know how to hard-code to add APN?

---------------------------------------

AT+CFUN?
ÂÅ0000 0x40000      Non-Secure     rwxl
Peripheral              Domain      Status
00 NRF_P0               Non-Secure   OK
01 NRF_CLOCK            Non-Secure   OK
02 NRF_RTC0             Non-Secure   OK
03 NRF_RTC1             Non-Secure   OK
04 NRF_NVMC             Non-Secure   OK
05 NRF_UARTE1           Non-Secure   OK
06 NRF_UARTE2           Secure       SKIP
07 NRF_TWIM2            Non-Secure   OK
08 NRF_SPIM3            Non-Secure   OK
09 NRF_TIMER0           Non-Secure   OK
10 NRF_TIMER1           Non-Secure   OK
11 NRF_TIMER2           Non-Secure   OK
12 NRF_SAADC            Non-Secure   OK
13 NRF_PWM0             Non-Secure   OK
14 NRF_PWM1             Non-Secure   OK
15 NRF_PWM2             Non-Secure   OK
16 NRF_PWM3             Non-Secure   OK
17 NRF_WDT              Non-Secure   OK
18 NRF_IPC              Non-Secure   OK
19 NRF_VMC              Non-Secure   OK
20 NRF_FPU              Non-Secure   OK
21 NRF_EGU1             Non-Secure   OK
22 NRF_EGU2             Non-Secure   OK
23 NRF_DPPIC            Non-Secure   OK
24 NRF_GPIOTE1          Non-Secure   OK
25 NRF_REGULATORS       Non-Secure   OK
SPM: NS image at 0xc000
SPM: NS MSP at 0x20025338
SPM: NS reset vector at 0xfcd9
SPM: prepare to jump to Non-Secure image.
*** Booting Zephyr OS build v2.4.0-ncs1-1710-g5a7b4eb71047  ***
[00:00:00.207,122] [0m<inf> at_host: UART check failed: 1. Dropping buffer and retrying.[0m
[00:00:00.217,254] [0m<inf> mqtt_simple: The MQTT simple sample started[0m
[00:00:00.217,254] [1;31m<err> os: ***** BUS FAULT *****[0m
[00:00:00.217,254] [1;31m<err> os:   Precise data bus error[0m
[00:00:00.217,254] [1;31m<err> os:   BFAR Address: 0x636f6d22[0m
[00:00:00.217,285] [1;31m<err> os: r0/a1:  0x636f6d22  r1/a2:  0x00000000  r2/a3:  0x00000000[0m
[00:00:00.217,285] [1;31m<err> os: r3/a4:  0x00000000 r12/ip:  0x20020104 r14/lr:  0x0000d465[0m
[00:00:00.217,285] [1;31m<err> os:  xpsr:  0x21000000[0m
[00:00:00.217,285] [1;31m<err> os: s[ 0]:  0x00000000  s[ 1]:  0x00000000  s[ 2]:  0x00000000  s[ 3]:  0x00000000[0m
[00:00:00.217,315] [1;31m<err> os: s[ 4]:  0x00000000  s[ 5]:  0x00000000  s[ 6]:  0x00000000  s[ 7]:  0x00000000[0m
[00:00:00.217,315] [1;31m<err> os: s[ 8]:  0x00000000  s[ 9]:  0x00000000  s[10]:  0x00000000  s[11]:  0x00000000[0m
[00:00:00.217,346] [1;31m<err> os: s[12]:  0x00000000  s[13]:  0x00000000  s[14]:  0x00000000  s[15]:  0x00000000[0m
[00:00:00.217,346] [1;31m<err> os: fpscr:  0x00000000[0m
[00:00:00.217,346] [1;31m<err> os: Faulting instruction address (r15/pc): 0x000124ec[0m
[00:00:00.217,346] [1;31m<err> os: >>> ZEPHYR FATAL ERROR 0: CPU exception on CPU 0[0m
[00:00:00.217,346] [1;31m<err> os: Current thread: 0x200205a8 (unknown)[0m
[00:00:00.341,796] [1;31m<err> fatal_error: Resetting system[0m
*** Booting Zephyr OS build v2.4.0-ncs1-1710-g5a7b4eb71047  ***
Flash regions             Domain     Permissions
00 00 0x00000 0x08000     Secure     rwxl
01 31 0x08000 0x100000   Non-Secure  rwxl
Non-secure callable region 0 placed in flash region 0 with size 32.
SRAM region               Domain     Permissions
00 07 0x00000 0x10000     Secure     rwxl
08 31 0x10000 0x40000    Non-Secure  rwxl
---------------------------------------

Didrik Rokhaug · Accepted Answer

Hi, 
 From the log, I can see that your device is crashing shortly after startup. 
 The reason for this is twofold: 
 1. 
 
 'AT+CGDCONT=1,"IP","isp.telus.com"' 
 This is not a valid character. In C ' is used for char literals, while " is used for string literals. If you want to use " inside a string, it must be escaped with \. 
 Your AT command string should therefore be: "AT+CGDCONT=1,\"IP\",\"isp.telus.com\"". 
 2. This would normally be caught by the compiler, but it also doesn't seem like you have included <modem/at_cmd.h> in your .c file. Because of this, the compiler doesn't know what type you are intending to have, and only issues a warning. 
 Finally, to set the APN used by the default bearer, you must use cid 0, not 1. 
 Best regards, 
 Didrik

set APN

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