AWS IoT example getting RSRP results in HARD FAULT

[Elith]

In the AWS IoT example I have been trying to add RSRP support (i.e. getting RSRP when sending my data packet).

I registered the handler/callback function in main after modem_info_init() like modem_info_rsrp_register(rsrp_handler); where

uint16_t rsrp_value = 255;
void rsrp_handler(char rsrp_val)
{
    //printk("RSRP Subscription: %d\n", rsrp_val);
    if (rsrp_val != 255)
    {
        rsrp_value = (uint16_t)rsrp_val;
    }
}

And I just use the JSON function to add a number in the shadow_update() function.

However, once in a while:

Next data publication in 30 seconds
D: +CSCON notification
RRC mode: Connected
D: +CSCON notification
RRC mode: Idle
+CEREG: 5,1,"5DCC","0278120C",7,,,"00000000","00000110"
Publishing: {
        "state":        {
                "reported":     {
                        "device":       "xyz",
                        "batv": 4445,
                        "rsrp": 60,
                        "mode": 1,
                        "datim":        "20/09/29,07:54:44+08",
                        "timestamp":    1601366084484
                }
        }
} to AWS IoT broker
E: Exception occurred in Secure State
E: ***** HARD FAULT *****
E:   Fault escalation (see below)
E: ***** BUS FAULT *****
E:   Precise data bus error
E:   BFAR Address: 0x50015504
E: r0/a1:  0x00000018  r1/a2:  0x00000090  r2/a3:  0x00000247
E: r3/a4:  0x0002f22b r12/ip:  0x200214d0 r14/lr:  0x000000aa
E:  xpsr:  0x20020400
E: s[ 0]:  0x00000000  s[ 1]:  0x00000000  s[ 2]:  0x00000000  s[ 3]:  0x00000000
E: s[ 4]:  0x00000000  s[ 5]:  0x00000000  s[ 6]:  0x00000000  s[ 7]:  0x00000000
E: s[ 8]:  0x00000000  s[ 9]:  0x00000000  s[10]:  0x00000000  s[11]:  0x00000000
E: s[12]:  0x00000000  s[13]:  0x00000000  s[14]:  0x00000000  s[15]:  0x00000000
E: fpscr:  0x00000000
E: Faulting instruction address (r15/pc): 0x20020ac8
E: >>> ZEPHYR FATAL ERROR 0: CPU exception on CPU 0
E: Current thread: 0x20020ac8 (unknown)
E: Resetting system

What's happening?

I also tried using modem_info_short_get(MODEM_INFO_RSRP, &rsrp_value); inside shadow_update(), however it only yields a valid number the first time. Afterwards it just gives 255. I have PSM enabled, so I figured this was why this approach did not work. I also tried triggering the AT command/modem_info_short_get from the lte event handler, but it becomes circular and resets (should be this way according to docs as far as I can tell), so just to let you know what I tried.

[Elith]

Alright, newest status this morning is: Completely new aws_iot project yields:

*** Booting Zephyr OS build v2.3.0-rc1-ncs1-2410-g7d20f2ebf259  ***
Flash regions           Domain          Permissions
00 02 0x00000 0x18000   Secure          rwxl
03 31 0x18000 0x100000  Non-Secure      rwxl

Non-secure callable region 0 placed in flash region 2 with size 32.

SRAM region             Domain          Permissions
00 07 0x00000 0x10000   Secure          rwxl
08 31 0x10000 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 0x18200
SPM: NS MSP at 0x20029c80
SPM: NS reset vector at 0x1d9cd
SPM: prepare to jump to Non-Secure image.
*** Booting Zephyr OS build v2.3.0-rc1-ncs1-2410-g7d20f2ebf259  ***
E: AT socket could not be opened
E: thingy91_magpio_configure failed with error: -14
The AWS IoT sample started, version: v1.0.0
LTE cell changed: Cell ID: 41423372, Tracking area: 24012
PSM parameter update: TAU: -1, Active time: -1
RRC mode: Connected
Network registration status: Connected - home network
PSM parameter update: TAU: 3600, Active time: 0
DATE_TIME_OBTAINED_NTP
AWS_IOT_EVT_CONNECTING
I: Created notify_next_topic $aws/things/nrf-074626/jobs/notify-next
I: Created get_topic $aws/things/nrf-074626/jobs/$next/get/#
I: previously subscribed to notify-next topic
I: Publish topic: $aws/things/nrf-074626/jobs/$next/get
I: Publish payload {"clientToken": ""}
AWS_IOT_EVT_CONNECTED
Persistent session enabled
Publishing: {
        "state":        {
                "reported":     {
                        "app_version":  "v1.0.0",
                        "batv": 4425,
                        "ts":   1601447933251
                }
        }
} to AWS IoT broker
AWS_IOT_EVT_READY
I: Checking for an available job
I: No queued jobs for this device
PSM parameter update: TAU: 1800, Active time: 60
RRC mode: Idle
Publishing: {
        "state":        {
                "reported":     {
                        "batv": 4195,
                        "ts":   1601447953252
                }
        }
} to AWS IoT broker
Next data publication in 20 seconds
RRC mode: Connected
RRC mode: Idle
Publishing: {
        "state":        {
                "reported":     {
                        "batv": 4421,
                        "ts":   1601447973329
                }
        }
} to AWS IoT broker
E: Exception occurred in Secure State
E: ***** HARD FAULT *****
E:   Fault escalation (see below)
E: ***** BUS FAULT *****
E:   Precise data bus error
E:   BFAR Address: 0x50015504
E: r0/a1:  0x0000000c  r1/a2:  0x00000090  r2/a3:  0x00000246
E: r3/a4:  0x000337f5 r12/ip:  0x20023108 r14/lr:  0x00000080
E:  xpsr:  0x20020400
E: s[ 0]:  0x00000000  s[ 1]:  0x00000000  s[ 2]:  0x00000000  s[ 3]:  0x00000000
E: s[ 4]:  0x00000000  s[ 5]:  0x00000000  s[ 6]:  0x00000000  s[ 7]:  0x00000000
E: s[ 8]:  0x00000000  s[ 9]:  0x00000000  s[10]:  0x00000000  s[11]:  0x00000000
E: s[12]:  0x00000000  s[13]:  0x00000000  s[14]:  0x00000000  s[15]:  0x00000000
E: fpscr:  0x00000000
E: Faulting instruction address (r15/pc): 0x20022490
E: >>> ZEPHYR FATAL ERROR 0: CPU exception on CPU 0
E: Current thread: 0x20022490 (unknown)
E: Resetting system
*** Booting Zephyr OS build v2.3.0-rc1-ncs1-2410-g7d20f2ebf259  ***
Flash regions           Domain          Permissions
00 02 0x00000 0x18000   Secure          rwxl
03 31 0x18000 0x100000  Non-Secure      rwxl

Non-secure callable region 0 placed in flash region 2 with size 32.

SRAM region             Domain          Permissions
00 07 0x00000 0x10000   Secure          rwxl
08 31 0x10000 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 0x18200
SPM: NS MSP at 0x20029c80
SPM: NS reset vector at 0x1d9cd
SPM: prepare to jump to Non-Secure image.
*** Booting Zephyr OS build v2.3.0-rc1-ncs1-2410-g7d20f2ebf259  ***
E: AT socket could not be opened
E: thingy91_magpio_configure failed with error: -14
The AWS IoT sample started, version: v1.0.0

The aws_iot_send() is responsible somehow.