nRF9160 fails to attach after several RESETs & attach without power cycle

[Michal Mühlpachr]

Hi,

nRF9160 with SLM NCS v1.9.1 fails to attach after 7th RESET (by RESET pin) & attach without power cycle.

There is not any ERROR state reported by modem, modem fails to attach forever without power cycle.

After nRF9160 power cycle it attaches immediately with same AT sequence.

We need reliable initialization of nRF9160 SLM/Modem without nRF9160 power cycle because we do not have load power in production HW - issue threatens device stability in the field.

I prepared Python script to reproduce issue with nRF9160DK, you can find it together with log at https://gist.github.com/muhlpachr/40a4d8f1b332aee8a25fa7e1ad023751
Modify COM port for AT commands according your PC setup please.

Issue is 100% reproducible.

Attached you can find modem trace.

Thank you.

Regards,
Michal

trace-2022-03-24T23-42-16.760Z.bin

[Michal Mühlpachr]

Hi,

I collected trace again together with AT dialogue log, both are below.

It is obvious, that even 120+ delay between attach and REST by pin does not prevent RESET LOOP.

Regads,
Michal

trace-2022-04-05T22-07-42.333Z.bin

First number on each line is time in seconds since test start, second number is relative time in seconds since cycle start.

<nRF9160DK power cycle>
========== CYCLE: 1 ========== Wed Apr 6 00:07:43 2022
0.31 0.00 <RESET by pin>
1.43 1.12 <WAKEUP by pin>
2.22 1.91 Ready
2.23 1.92 AT
2.26 1.96 OK
2.28 1.97 AT%XMODEMTRACE=1,2
2.31 2.00 OK
2.33 2.02 AT%MDMEV=1
2.36 2.05 OK
2.38 2.07 AT%HWVERSION
2.41 2.10 %HWVERSION: nRF9160 SICA BQA
2.42 2.11 OK
2.44 2.13 AT%SHORTSWVER
2.47 2.16 %SHORTSWVER: nrf9160_1.3.1
2.49 2.18 OK
2.50 2.19 AT%XPOFWARN=1,30
2.55 2.24 OK
2.56 2.25 AT%XSYSTEMMODE=0,1,0,0
2.61 2.30 OK
2.63 2.32 AT%REL14FEAT=1,1,1,1,0
2.66 2.35 OK
2.67 2.36 AT%RAI=1
2.71 2.40 OK
2.72 2.41 AT%XDATAPRFL=0
2.75 2.44 OK
2.77 2.46 AT%XSIM=1
2.80 2.49 OK
2.81 2.51 AT%XNETTIME=1
2.85 2.54 OK
2.86 2.55 AT+CEREG=5
2.89 2.58 OK
2.91 2.60 AT+CGEREP=1
2.94 2.63 OK
2.96 2.65 AT+CSCON=1
2.99 2.68 OK
3.00 2.69 AT+CPSMS=1,,,"00111000","00000000"
3.05 2.74 OK
3.07 2.76 AT+CNEC=24
3.10 2.79 OK
3.11 2.80 AT+CMEE=1
3.14 2.83 OK
3.16 2.85 AT+CEPPI=1
3.19 2.88 OK
3.21 2.90 AT#XSLEEP=2
3.24 2.93 OK
4.38 4.07 <WAKEUP by pin>
4.48 4.17 Ready
4.50 4.19 AT%XMODEMTRACE=1,2
4.53 4.22 OK
4.55 4.24 AT%XBANDLOCK=1,"0000000000000000000000000000000000000000000000000000000000001000000010000000100010011010"
4.59 4.28 OK
4.61 4.30 AT+COPS=1,2,"23003"
4.66 4.35 OK
4.67 4.36 AT+CGDCONT=1,"IP","hardwario.com"
4.70 4.39 OK
4.72 4.41 AT+CFUN=1
4.83 4.52 OK
5.73 5.42 %XSIM: 1
5.75 5.44 AT+CGSN
5.78 5.47 352656106109476
5.80 5.49 OK
5.81 5.50 AT+CIMI
5.84 5.53 901288000012723
5.86 5.55 OK
10.91 10.60 +CEREG: 2,"AE38","000AC51F",9
11.59 11.28 +CSCON: 1
12.76 12.45 +CGEV: ME PDN ACT 0,0
12.79 12.48 +CNEC_ESM: 50,0
12.82 12.51 %MDMEV: SEARCH STATUS 2
12.85 12.54 +CEREG: 5,"AE38","000AC51F",9,,,"00000000","00111000"
Wait 2m
========== CYCLE: 2 ========== Wed Apr 6 00:09:56 2022
133.18 0.00 <RESET by pin>
134.29 1.12 <WAKEUP by pin>
135.08 1.90 Ready
135.10 1.92 AT
135.13 1.95 OK
135.14 1.97 AT%XMODEMTRACE=1,2
135.17 2.00 OK
135.19 2.01 AT%MDMEV=1
135.22 2.04 OK
135.24 2.06 AT%HWVERSION
135.27 2.09 %HWVERSION: nRF9160 SICA BQA
135.28 2.11 OK
135.30 2.12 AT%SHORTSWVER
135.33 2.15 %SHORTSWVER: nrf9160_1.3.1
135.35 2.17 OK
135.36 2.18 AT%XPOFWARN=1,30
135.41 2.23 OK
135.42 2.25 AT%XSYSTEMMODE=0,1,0,0
135.47 2.29 OK
135.49 2.31 AT%REL14FEAT=1,1,1,1,0
135.52 2.34 OK
135.53 2.36 AT%RAI=1
135.56 2.39 OK
135.58 2.40 AT%XDATAPRFL=0
135.61 2.43 OK
135.63 2.45 AT%XSIM=1
135.66 2.48 OK
135.67 2.50 AT%XNETTIME=1
135.70 2.53 OK
135.72 2.54 AT+CEREG=5
135.75 2.58 OK
135.77 2.59 AT+CGEREP=1
135.80 2.62 OK
135.81 2.64 AT+CSCON=1
135.84 2.67 OK
135.86 2.68 AT+CPSMS=1,,,"00111000","00000000"
135.89 2.71 OK
135.91 2.73 AT+CNEC=24
135.94 2.76 OK
135.95 2.78 AT+CMEE=1
135.98 2.81 OK
136.00 2.82 AT+CEPPI=1
136.03 2.85 OK
136.05 2.87 AT#XSLEEP=2
136.08 2.90 OK
137.20 4.03 <WAKEUP by pin>
137.31 4.14 Ready
137.33 4.15 AT%XMODEMTRACE=1,2
137.37 4.20 OK
137.39 4.21 AT%XBANDLOCK=1,"0000000000000000000000000000000000000000000000000000000000001000000010000000100010011010"
137.43 4.26 OK
137.45 4.27 AT+COPS=1,2,"23003"
137.49 4.32 OK
137.51 4.33 AT+CGDCONT=1,"IP","hardwario.com"
137.54 4.36 OK
137.56 4.38 AT+CFUN=1
137.66 4.49 OK
138.57 5.39 %XSIM: 1
138.59 5.41 AT+CGSN
138.62 5.44 352656106109476
138.63 5.46 OK
138.65 5.47 AT+CIMI
138.68 5.50 901288000012723
138.70 5.52 OK
144.02 10.85 +CEREG: 2,"AE38","000AC51F",9
144.71 11.53 +CSCON: 1
145.92 12.74 +CGEV: ME PDN ACT 0,0
145.95 12.78 +CNEC_ESM: 50,0
145.98 12.81 %MDMEV: SEARCH STATUS 2
146.01 12.84 +CEREG: 5,"AE38","000AC51F",9,,,"00000000","00111000"
Wait 2m
========== CYCLE: 3 ========== Wed Apr 6 00:12:09 2022
266.35 0.00 <RESET by pin>
267.47 1.12 <WAKEUP by pin>
268.26 1.92 Ready
268.28 1.93 AT
268.31 1.96 OK
268.33 1.98 AT%XMODEMTRACE=1,2
268.36 2.01 OK
268.37 2.03 AT%MDMEV=1
268.40 2.06 OK
268.42 2.07 AT%HWVERSION
268.45 2.10 %HWVERSION: nRF9160 SICA BQA
268.47 2.12 OK
268.48 2.14 AT%SHORTSWVER
268.51 2.17 %SHORTSWVER: nrf9160_1.3.1
268.53 2.18 OK
268.55 2.20 AT%XPOFWARN=1,30
268.59 2.24 OK
268.61 2.26 AT%XSYSTEMMODE=0,1,0,0
268.65 2.31 OK
268.67 2.32 AT%REL14FEAT=1,1,1,1,0
268.70 2.35 OK
268.72 2.37 AT%RAI=1
268.75 2.40 OK
268.76 2.42 AT%XDATAPRFL=0
268.79 2.45 OK
268.81 2.46 AT%XSIM=1
268.84 2.49 OK
268.86 2.51 AT%XNETTIME=1
268.89 2.54 OK
268.90 2.56 AT+CEREG=5
268.93 2.59 OK
268.95 2.60 AT+CGEREP=1
268.98 2.64 OK
269.00 2.65 AT+CSCON=1
269.03 2.68 OK
269.04 2.70 AT+CPSMS=1,,,"00111000","00000000"
269.09 2.74 OK
269.11 2.76 AT+CNEC=24
269.14 2.79 OK
269.15 2.81 AT+CMEE=1
269.18 2.84 OK
269.20 2.85 AT+CEPPI=1
269.23 2.88 OK
269.25 2.90 AT#XSLEEP=2
269.28 2.93 OK
270.42 4.07 <WAKEUP by pin>
270.52 4.18 Ready
270.54 4.19 AT%XMODEMTRACE=1,2
270.57 4.22 OK
270.59 4.24 AT%XBANDLOCK=1,"0000000000000000000000000000000000000000000000000000000000001000000010000000100010011010"
270.63 4.29 OK
270.65 4.30 AT+COPS=1,2,"23003"
270.70 4.35 OK
270.71 4.37 AT+CGDCONT=1,"IP","hardwario.com"
270.76 4.41 OK
270.77 4.43 AT+CFUN=1
270.88 4.54 OK
271.78 5.44 %XSIM: 1
271.80 5.45 AT+CGSN
271.83 5.48 352656106109476
271.85 5.50 OK
271.86 5.52 AT+CIMI
271.89 5.55 901288000012723
271.91 5.56 OK
277.14 10.79 +CEREG: 2,"AE38","000AC51F",9
277.83 11.48 +CSCON: 1
279.27 12.92 +CGEV: ME PDN ACT 0,0
279.30 12.95 +CNEC_ESM: 50,0
279.33 12.98 %MDMEV: SEARCH STATUS 2
279.36 13.01 +CEREG: 5,"AE38","000AC51F",9,,,"00000000","00111000"
Wait 2m
========== CYCLE: 4 ========== Wed Apr 6 00:14:22 2022
399.70 0.00 <RESET by pin>
400.81 1.11 <WAKEUP by pin>
401.60 1.91 Ready
401.62 1.92 AT
401.65 1.95 OK
401.66 1.97 AT%XMODEMTRACE=1,2
401.70 2.00 OK
401.71 2.01 AT%MDMEV=1
401.74 2.05 OK
401.76 2.06 AT%HWVERSION
401.79 2.09 %HWVERSION: nRF9160 SICA BQA
401.81 2.11 OK
401.82 2.12 AT%SHORTSWVER
401.85 2.16 %SHORTSWVER: nrf9160_1.3.1
401.87 2.17 OK
401.88 2.19 AT%XPOFWARN=1,30
401.93 2.23 OK
401.95 2.25 AT%XSYSTEMMODE=0,1,0,0
401.99 2.30 OK
402.01 2.31 AT%REL14FEAT=1,1,1,1,0
402.04 2.34 OK
402.05 2.36 AT%RAI=1
402.08 2.39 OK
402.10 2.40 AT%XDATAPRFL=0
402.13 2.43 OK
402.15 2.45 AT%XSIM=1
402.18 2.48 OK
402.19 2.50 AT%XNETTIME=1
402.23 2.53 OK
402.24 2.54 AT+CEREG=5
402.27 2.57 OK
402.29 2.59 AT+CGEREP=1
402.32 2.62 OK
402.34 2.64 AT+CSCON=1
402.37 2.67 OK
402.38 2.68 AT+CPSMS=1,,,"00111000","00000000"
402.43 2.73 OK
402.44 2.75 AT+CNEC=24
402.48 2.78 OK
402.49 2.79 AT+CMEE=1
402.52 2.83 OK
402.54 2.84 AT+CEPPI=1
402.57 2.87 OK
402.59 2.89 AT#XSLEEP=2
402.62 2.92 OK
403.74 4.05 <WAKEUP by pin>
403.85 4.15 Ready
403.87 4.17 AT%XMODEMTRACE=1,2
403.90 4.20 OK
403.91 4.22 AT%XBANDLOCK=1,"0000000000000000000000000000000000000000000000000000000000001000000010000000100010011010"
403.96 4.26 OK
403.98 4.28 AT+COPS=1,2,"23003"
404.02 4.32 OK
404.04 4.34 AT+CGDCONT=1,"IP","hardwario.com"
404.08 4.39 OK
404.10 4.40 AT+CFUN=1
404.21 4.51 OK
405.12 5.42 %XSIM: 1
405.13 5.44 AT+CGSN
405.16 5.47 352656106109476
405.18 5.48 OK
405.20 5.50 AT+CIMI
405.23 5.53 901288000012723
405.24 5.54 OK
410.26 10.56 +CEREG: 2,"AE38","000AC51F",9
410.95 11.25 +CSCON: 1
412.19 12.49 +CGEV: ME PDN ACT 0,0
412.22 12.52 +CNEC_ESM: 50,0
412.25 12.55 %MDMEV: SEARCH STATUS 2
412.28 12.58 +CEREG: 5,"AE38","000AC51F",9,,,"00000000","00111000"
Wait 2m
========== CYCLE: 5 ========== Wed Apr 6 00:16:35 2022
532.62 0.00 <RESET by pin>
533.74 1.12 <WAKEUP by pin>
534.54 1.92 Ready
534.55 1.93 AT
534.58 1.97 OK
534.60 1.98 AT%XMODEMTRACE=1,2
534.63 2.01 OK
534.65 2.03 AT%MDMEV=1
534.68 2.06 OK
534.70 2.08 AT%HWVERSION
534.73 2.11 %HWVERSION: nRF9160 SICA BQA
534.74 2.12 OK
534.76 2.14 AT%SHORTSWVER
534.79 2.17 %SHORTSWVER: nrf9160_1.3.1
534.80 2.18 OK
534.82 2.20 AT%XPOFWARN=1,30
534.87 2.25 OK
534.88 2.26 AT%XSYSTEMMODE=0,1,0,0
534.93 2.31 OK
534.94 2.32 AT%REL14FEAT=1,1,1,1,0
534.97 2.35 OK
534.99 2.37 AT%RAI=1
535.02 2.40 OK
535.03 2.42 AT%XDATAPRFL=0
535.07 2.45 OK
535.08 2.46 AT%XSIM=1
535.11 2.49 OK
535.13 2.51 AT%XNETTIME=1
535.16 2.54 OK
535.18 2.56 AT+CEREG=5
535.21 2.59 OK
535.22 2.60 AT+CGEREP=1
535.25 2.64 OK
535.27 2.65 AT+CSCON=1
535.30 2.68 OK
535.32 2.70 AT+CPSMS=1,,,"00111000","00000000"
535.36 2.74 OK
535.38 2.76 AT+CNEC=24
535.41 2.79 OK
535.42 2.81 AT+CMEE=1
535.46 2.84 OK
535.47 2.85 AT+CEPPI=1
535.50 2.89 OK
535.52 2.90 AT#XSLEEP=2
535.55 2.93 OK
536.69 4.07 <WAKEUP by pin>
536.80 4.18 Ready
536.81 4.20 AT%XMODEMTRACE=1,2
536.85 4.23 OK
536.86 4.24 AT%XBANDLOCK=1,"0000000000000000000000000000000000000000000000000000000000001000000010000000100010011010"
536.91 4.29 OK
536.92 4.30 AT+COPS=1,2,"23003"
536.97 4.35 OK
536.99 4.37 AT+CGDCONT=1,"IP","hardwario.com"
537.03 4.42 OK
537.05 4.43 AT+CFUN=1
537.16 4.54 OK
538.06 5.45 %XSIM: 1
538.08 5.46 AT+CGSN
538.11 5.49 352656106109476
538.13 5.51 OK
538.14 5.52 AT+CIMI
538.17 5.56 901288000012723
538.19 5.57 OK
543.38 10.76 +CEREG: 2,"AE38","000AC51F",9
544.07 11.45 +CSCON: 1
545.13 12.51 +CGEV: ME PDN ACT 0,0
545.16 12.54 +CNEC_ESM: 50,0
545.19 12.57 %MDMEV: SEARCH STATUS 2
545.23 12.61 +CEREG: 5,"AE38","000AC51F",9,,,"00000000","00111000"
Wait 2m
========== CYCLE: 6 ========== Wed Apr 6 00:18:48 2022
665.57 0.00 <RESET by pin>
666.68 1.11 <WAKEUP by pin>
667.46 1.89 Ready
667.48 1.91 AT
667.51 1.94 OK
667.52 1.95 AT%XMODEMTRACE=1,2
667.55 1.99 OK
667.57 2.00 AT%MDMEV=1
667.60 2.03 OK
667.62 2.05 AT%HWVERSION
667.65 2.08 %HWVERSION: nRF9160 SICA BQA
667.66 2.10 OK
667.68 2.11 AT%SHORTSWVER
667.71 2.14 %SHORTSWVER: nrf9160_1.3.1
667.73 2.16 OK
667.74 2.18 AT%XPOFWARN=1,30
667.79 2.22 OK
667.81 2.24 AT%XSYSTEMMODE=0,1,0,0
667.85 2.28 OK
667.87 2.30 AT%REL14FEAT=1,1,1,1,0
667.90 2.33 OK
667.91 2.34 AT%RAI=1
667.94 2.38 OK
667.96 2.39 AT%XDATAPRFL=0
667.99 2.42 OK
668.01 2.44 AT%XSIM=1
668.04 2.47 OK
668.05 2.49 AT%XNETTIME=1
668.09 2.52 OK
668.10 2.53 AT+CEREG=5
668.13 2.56 OK
668.15 2.58 AT+CGEREP=1
668.18 2.61 OK
668.19 2.62 AT+CSCON=1
668.22 2.65 OK
668.24 2.67 AT+CPSMS=1,,,"00111000","00000000"
668.29 2.72 OK
668.30 2.73 AT+CNEC=24
668.33 2.76 OK
668.35 2.78 AT+CMEE=1
668.38 2.81 OK
668.40 2.83 AT+CEPPI=1
668.43 2.86 OK
668.44 2.87 AT#XSLEEP=2
668.47 2.90 OK
669.60 4.03 <WAKEUP by pin>
669.71 4.14 Ready
669.72 4.15 AT%XMODEMTRACE=1,2
669.75 4.19 OK
669.77 4.20 AT%XBANDLOCK=1,"0000000000000000000000000000000000000000000000000000000000001000000010000000100010011010"
669.82 4.25 OK
669.83 4.26 AT+COPS=1,2,"23003"
669.88 4.31 OK
669.89 4.32 AT+CGDCONT=1,"IP","hardwario.com"
669.94 4.37 OK
669.96 4.39 AT+CFUN=1
670.06 4.50 OK
670.97 5.40 %XSIM: 1
670.99 5.42 AT+CGSN
671.02 5.45 352656106109476
671.03 5.47 OK
671.05 5.48 AT+CIMI
671.08 5.51 901288000012723
671.10 5.53 OK
676.50 10.93 +CEREG: 2,"AE38","000AC51F",9
677.19 11.62 +CSCON: 1
678.72 13.15 +CGEV: ME PDN ACT 0,0
678.75 13.18 +CNEC_ESM: 50,0
678.78 13.21 %MDMEV: SEARCH STATUS 2
678.81 13.24 +CEREG: 5,"AE38","000AC51F",9,,,"00000000","00111000"
Wait 2m
========== CYCLE: 7 ========== Wed Apr 6 00:21:02 2022
799.14 0.00 <RESET by pin>
800.27 1.12 <WAKEUP by pin>
801.06 1.92 Ready
801.08 1.93 AT
801.11 1.96 OK
801.12 1.98 AT%XMODEMTRACE=1,2
801.16 2.01 OK
801.17 2.03 AT%MDMEV=1
801.20 2.06 OK
801.22 2.07 AT%HWVERSION
801.26 2.12 %HWVERSION: nRF9160 SICA BQA
801.28 2.14 OK
801.30 2.15 AT%SHORTSWVER
801.33 2.18 %SHORTSWVER: nrf9160_1.3.1
801.34 2.20 OK
801.36 2.21 AT%XPOFWARN=1,30
801.40 2.26 OK
801.42 2.27 AT%XSYSTEMMODE=0,1,0,0
801.47 2.32 OK
801.48 2.34 AT%REL14FEAT=1,1,1,1,0
801.51 2.37 OK
801.53 2.38 AT%RAI=1
801.56 2.42 OK
801.58 2.43 AT%XDATAPRFL=0
801.61 2.46 OK
801.62 2.48 AT%XSIM=1
801.66 2.51 OK
801.67 2.53 AT%XNETTIME=1
801.70 2.56 OK
801.72 2.57 AT+CEREG=5
801.75 2.60 OK
801.76 2.62 AT+CGEREP=1
801.80 2.65 OK
801.81 2.67 AT+CSCON=1
801.84 2.70 OK
801.86 2.71 AT+CPSMS=1,,,"00111000","00000000"
801.91 2.76 OK
801.92 2.78 AT+CNEC=24
801.95 2.81 OK
801.97 2.82 AT+CMEE=1
802.00 2.85 OK
802.01 2.87 AT+CEPPI=1
802.04 2.90 OK
802.06 2.92 AT#XSLEEP=2
802.09 2.95 OK
803.23 4.09 <WAKEUP by pin>
803.34 4.20 Ready
803.36 4.21 AT%XMODEMTRACE=1,2
803.40 4.26 OK
803.42 4.27 AT%XBANDLOCK=1,"0000000000000000000000000000000000000000000000000000000000001000000010000000100010011010"
803.47 4.32 OK
803.48 4.34 AT+COPS=1,2,"23003"
803.53 4.38 OK
803.55 4.40 AT+CGDCONT=1,"IP","hardwario.com"
803.59 4.45 OK
803.61 4.46 AT+CFUN=1
803.72 4.57 OK
803.75 4.60 %MDMEV: RESET LOOP
804.62 5.48 %XSIM: 1
804.64 5.50 AT+CGSN
804.67 5.53 352656106109476
804.69 5.54 OK
804.70 5.56 AT+CIMI
804.73 5.59 901288000012723
804.75 5.60 OK
809.60 10.46 +CEREG: 2,"AE38","000AC51F",9

[Michal Mühlpachr]

30m timer works ONLY when SLM is kept in execution (hi power consumption). In that case modem/SLM exits RESET LOOP within 30m.
In case modem is RESET by pin several seconds after RESET LOOP event and kept that state till next try, even after 40+ minutes modem still returns RESET LOOP.

[Øyvind]

Hello Michal, 

Our expert has looked at the correct trace that shows the same behavior

00:00:00.104095 STARTUP_FUNCTION_RUN L23 Protocol init // <- reset
00:00:07.599090 L23_AT_STRING AT_STRING <= +CEREG: 5,"AE38","000AC51F",9,,,"00000000","00111000"\r\n  // Attach completed
00:00:29.531158 STARTUP_FUNCTION_RUN L23 Protocol init  // <- reset after 22s
00:00:41.269745 L23_AT_STRING AT_STRING <= +CEREG: 5,"AE38","000AC51F",9,,,"00000000","00111000"\r\n  // Attach completed
00:01:02.012634 STARTUP_FUNCTION_RUN L23 Protocol init // <- reset after 21s
00:01:10.174042 L23_AT_STRING AT_STRING <= +CEREG: 5,"AE38","000AC51F",9,,,"00000000","00111000"\r\n  // Attach completed
00:01:31.039642 STARTUP_FUNCTION_RUN L23 Protocol init // <- reset after 21s
00:01:43.950745 L23_AT_STRING AT_STRING <= +CEREG: 5,"AE38","000AC51F",9,,,"00000000","00111000"\r\n  // Attach completed
00:02:04.542755 STARTUP_FUNCTION_RUN L23 Protocol init // <- reset after 21s
00:02:13.114563 L23_AT_STRING AT_STRING <= +CEREG: 5,"AE38","000AC51F",9,,,"00000000","00111000"\r\n  // Attach completed
00:02:42.965027 STARTUP_FUNCTION_RUN L23 Protocol init // <- reset after 20s
00:02:53.406464 L23_AT_STRING AT_STRING <= +CEREG: 5,"AE38","000AC51F",9,,,"00000000","00111000"\r\n  // Attach completed
00:03:14.374512 STARTUP_FUNCTION_RUN L23 Protocol init // <- reset after 21s
00:03:17.692444 L23_AT_STRING AT_STRING <= %MDMEV: RESET LOOP\r\n // <- Reset loop restriction activated

1. Must wait over 60s after Attach before triggering reset. Attach completion can be noticed by subscribing and following +CEREG notification.

2. If the Reset loop restriction was activated by mistake in step 1, then use AT%XFACTORYRESET=0 to remove the restriction. Reset loop restriction activation can be noticed by subscribing and following %MDMEV notification.

Kind regards,
Øyvind

[Øyvind]

Michal Mühlpachr said:

I collected trace again together with AT dialogue log, both are below.

Sorry, I did not see this comment. Have forwarded to our team to look at. I agree that this looks correct from the AT dialogue log.

-Øyvind

[Øyvind]

Michal, 

The modem traces shows no change.

00:00:00.003021 STARTUP_FUNCTION_RUN L23 Protocol init 
00:00:10.712555 L23_AT_STRING AT_STRING <= +CEREG: 5,"AE38","000AC51F",9,,,"00000000","00111000"\r\n 
00:00:31.664612 STARTUP_FUNCTION_RUN L23 Protocol init 
00:00:42.658203 L23_AT_STRING AT_STRING <= +CEREG: 5,"AE38","000AC51F",9,,,"00000000","00111000"\r\n 
00:01:03.617859 STARTUP_FUNCTION_RUN L23 Protocol init 
00:01:14.782135 L23_AT_STRING AT_STRING <= +CEREG: 5,"AE38","000AC51F",9,,,"00000000","00111000"\r\n 
00:01:35.480194 STARTUP_FUNCTION_RUN L23 Protocol init 
00:01:46.228577 L23_AT_STRING AT_STRING <= +CEREG: 5,"AE38","000AC51F",9,,,"00000000","00111000"\r\n 
00:02:07.124206 STARTUP_FUNCTION_RUN L23 Protocol init 
00:02:17.881500 L23_AT_STRING AT_STRING <= +CEREG: 5,"AE38","000AC51F",9,,,"00000000","00111000"\r\n 
00:02:38.963592 STARTUP_FUNCTION_RUN L23 Protocol init 
00:02:50.366547 L23_AT_STRING AT_STRING <= +CEREG: 5,"AE38","000AC51F",9,,,"00000000","00111000"\r\n 
00:03:10.976166 STARTUP_FUNCTION_RUN L23 Protocol init 
00:03:13.759186 L23_AT_STRING AT_STRING <= %MDMEV: RESET LOOP\r\n

Can you share your project for me to look at and test. I will convert this ticket to Private, if you can share.

Thanks.

Kind regards,
Øyvind