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

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

Øyvind — Thu, 05 May 2022 06:57:25 GMT

Hi Michal,

Thanks for clarifying.

My initial test with your script gave me error due to it waiting for CEREG: 5. I then modified some of the values to fit my network. It gets further, however, it fails with same error.

C:\Temp\Support\286487>python nrf9160_slm_at_dialogue.py
Power cycle nRF9160DK, press Enter
========== CYCLE: 1 ========== Wed May  4 20:43:24 2022
  0.31  0.00 <RESET by pin>
  1.43  1.12 <WAKEUP by pin>
  2.22  1.91      Ready
  2.23  1.93 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
  2.37  2.06 AT%HWVERSION
  2.40  2.10      %HWVERSION: nRF9160 SICA B1A
  2.42  2.11      OK
  2.44  2.13 AT%SHORTSWVER
  2.47  2.16      %SHORTSWVER: nrf9160_1.3.1
  2.48  2.17      OK
  2.50  2.19 AT%XPOFWARN=1,30
  2.54  2.24      OK
  2.56  2.25 AT%XSYSTEMMODE=1,0,0,1
  2.61  2.30      OK
  2.62  2.31 AT%REL14FEAT=1,1,1,1,0
  2.65  2.34      OK
  2.67  2.36 AT%RAI=1
  2.70  2.39      OK
  2.71  2.40 AT%XDATAPRFL=0
  2.74  2.44      OK
  2.76  2.45 AT%XSIM=1
  2.79  2.48      OK
  2.81  2.50 AT%XNETTIME=1
  2.84  2.53      OK
  2.85  2.54 AT+CEREG=5
  2.88  2.58      OK
  2.90  2.59 AT+CGEREP=1
  2.93  2.62      OK
  2.95  2.64 AT+CSCON=1
  2.98  2.67      OK
  2.99  2.69 AT+CPSMS=1,"","","00111000","00000000"
  3.04  2.73      OK
  3.06  2.75 AT+CNEC=24
  3.09  2.78      OK
  3.10  2.79 AT+CMEE=1
  3.13  2.82      OK
  3.15  2.84 AT+CEPPI=1
  3.18  2.87      OK
  3.20  2.89 AT#XSLEEP=2
  3.23  2.92      OK
  4.36  4.05 <WAKEUP by pin>
  4.47  4.16      Ready
  4.48  4.18 AT%XMODEMTRACE=1,2
  4.51  4.21      OK
  4.53  4.22 AT%XBANDLOCK=1,"0000000000000000000000000000000000000000000000000000000000001000000010000000100010011010"
  4.58  4.27      OK
  4.59  4.28 AT+COPS=0,2,"23003"
  4.62  4.32      OK
  4.64  4.33 AT+CGDCONT=1,"IP","hardwario.com"
  4.69  4.38      OK
  4.70  4.39 AT+CFUN=1
  4.79  4.49      OK
  5.66  5.35      %XSIM: 1
  5.67  5.37 AT+CGSN
  5.71  5.40      351358811477626
  5.72  5.41      OK
  5.74  5.43 AT+CIMI
  5.77  5.46      242016000036132
  5.78  5.48      OK
  5.96  5.65      +CEREG: 2,"7AA9","01172803",7
  5.99  5.68      +CSCON: 1
  7.04  6.73      +CGEV: ME PDN ACT 0
  7.08  6.77      %MDMEV: SEARCH STATUS 2
  7.11  6.81      +CEREG: 1,"7AA9","01172803",7,,,"00000000","00111000"
  7.15  6.84      +CGEV: IPV6 0
 19.21 18.90      +CSCON: 0
138.60 138.29 Failed to get: +CEREG: 5 !!! Wed May  4 20:45:43 2022

I then changed to iBasis SIM (since script complained about CEREG: 5 – Registered, roaming). This time it succeeded, and went through 7 cycles and 35 min wait.

C:\Temp\Support\286487>python nrf9160_slm_at_dialogue.py
Power cycle nRF9160DK, press Enter
========== CYCLE: 1 ========== Wed May  4 20:48:58 2022
  0.31  0.00 <RESET by pin>
  1.43  1.12 <WAKEUP by pin>
  2.21  1.90      Ready
  2.23  1.92 AT
  2.26  1.95      OK
  2.27  1.96 AT%XMODEMTRACE=1,2
  2.30  2.00      OK
  2.32  2.01 AT%MDMEV=1
  2.35  2.04      OK
  2.37  2.06 AT%HWVERSION
  2.40  2.09      %HWVERSION: nRF9160 SICA B1A
  2.41  2.10      OK
  2.43  2.12 AT%SHORTSWVER
  2.46  2.15      %SHORTSWVER: nrf9160_1.3.1
  2.48  2.17      OK
  2.49  2.18 AT%XPOFWARN=1,30
  2.54  2.23      OK
  2.55  2.24 AT%XSYSTEMMODE=1,0,0,1
  2.60  2.29      OK
  2.62  2.31 AT%REL14FEAT=1,1,1,1,0
  2.65  2.34      OK
  2.66  2.36 AT%RAI=1
  2.70  2.39      OK
  2.71  2.40 AT%XDATAPRFL=0
  2.74  2.43      OK
  2.76  2.45 AT%XSIM=1
  2.79  2.48      OK
  2.80  2.50 AT%XNETTIME=1
  2.84  2.53      OK
  2.85  2.54 AT+CEREG=5
  2.88  2.57      OK
  2.90  2.59 AT+CGEREP=1
  2.93  2.62      OK
  2.94  2.64 AT+CSCON=1
  2.98  2.67      OK
  2.99  2.68 AT+CPSMS=1,"","","00111000","00000000"
  3.04  2.73      OK
  3.05  2.75 AT+CNEC=24
  3.08  2.78      OK
  3.10  2.79 AT+CMEE=1
  3.13  2.82      OK
  3.15  2.84 AT+CEPPI=1
  3.18  2.87      OK
  3.19  2.89 AT#XSLEEP=2
  3.23  2.92      OK
  4.36  4.05 <WAKEUP by pin>
  4.46  4.16      Ready
  4.48  4.17 AT%XMODEMTRACE=1,2
  4.51  4.20      OK
  4.53  4.22 AT%XBANDLOCK=1,"0000000000000000000000000000000000000000000000000000000000001000000010000000100010011010"
  4.57  4.27      OK
  4.59  4.28 AT+COPS=0,2,"23003"
  4.64  4.33      OK
  4.65  4.34 AT+CGDCONT=1,"IP","hardwario.com"
  4.68  4.37      OK
  4.70  4.39 AT+CFUN=1
  4.79  4.48      OK
  5.98  5.67      %XSIM: 1
  6.00  5.69 AT+CGSN
  6.03  5.72      351358811477626
  6.04  5.74      OK
  6.06  5.75 AT+CIMI
  6.09  5.78      204080813517083
  6.11  5.80      OK
  8.64  8.33      +CEREG: 2,"08FF","0201EE16",7
  8.67  8.36      +CSCON: 1
 11.42 11.11      +CGEV: ME PDN ACT 0,0
 11.45 11.15      +CNEC_ESM: 50,0
 11.48 11.18      %MDMEV: SEARCH STATUS 2
 11.52 11.21      +CEREG: 5,"08FF","0201EE16",7,,,"11100000","11100000"
Wait 2m
========== CYCLE: 2 ========== Wed May  4 20:51:09 2022
131.85  0.00 <RESET by pin>
132.96  1.11 <WAKEUP by pin>
133.75  1.90      Ready
133.76  1.91 AT
133.79  1.94      OK
133.81  1.96 AT%XMODEMTRACE=1,2
133.84  1.99      OK
133.86  2.01 AT%MDMEV=1
133.89  2.04      OK
133.90  2.05 AT%HWVERSION
133.93  2.09      %HWVERSION: nRF9160 SICA B1A
133.95  2.10      OK
133.96  2.12 AT%SHORTSWVER
133.99  2.15      %SHORTSWVER: nrf9160_1.3.1
134.01  2.16      OK
134.03  2.18 AT%XPOFWARN=1,30
134.07  2.23      OK
134.09  2.24 AT%XSYSTEMMODE=1,0,0,1
134.14  2.29      OK
134.15  2.30 AT%REL14FEAT=1,1,1,1,0
134.18  2.34      OK
134.20  2.35 AT%RAI=1
134.23  2.38      OK
134.25  2.40 AT%XDATAPRFL=0
134.28  2.43      OK
134.29  2.45 AT%XSIM=1
134.32  2.48      OK
134.34  2.49 AT%XNETTIME=1
134.37  2.52      OK
134.39  2.54 AT+CEREG=5
134.42  2.57      OK
134.43  2.58 AT+CGEREP=1
134.46  2.62      OK
134.48  2.63 AT+CSCON=1
134.51  2.66      OK
134.53  2.68 AT+CPSMS=1,"","","00111000","00000000"
134.57  2.72      OK
134.59  2.74 AT+CNEC=24
134.62  2.77      OK
134.64  2.79 AT+CMEE=1
134.67  2.82      OK
134.68  2.83 AT+CEPPI=1
134.71  2.87      OK
134.73  2.88 AT#XSLEEP=2
134.76  2.91      OK
135.91  4.06 <WAKEUP by pin>
136.01  4.16      Ready
136.03  4.18 AT%XMODEMTRACE=1,2
136.06  4.21      OK
136.07  4.23 AT%XBANDLOCK=1,"0000000000000000000000000000000000000000000000000000000000001000000010000000100010011010"
136.12  4.27      OK
136.14  4.29 AT+COPS=0,2,"23003"
136.18  4.33      OK
136.20  4.35 AT+CGDCONT=1,"IP","hardwario.com"
136.23  4.38      OK
136.24  4.40 AT+CFUN=1
136.34  4.49      OK
137.54  5.70      %XSIM: 1
137.56  5.71 AT+CGSN
137.59  5.74      351358811477626
137.61  5.76      OK
137.62  5.77 AT+CIMI
137.65  5.80      204080813517083
137.67  5.82      OK
140.44  8.59      +CEREG: 2,"08FF","0201EE16",7
140.82  8.98      +CSCON: 1
143.73 11.88      +CGEV: ME PDN ACT 0,0
143.76 11.91      +CNEC_ESM: 50,0
143.79 11.94      %MDMEV: SEARCH STATUS 2
143.82 11.97      +CEREG: 5,"08FF","0201EE16",7,,,"11100000","11100000"
Wait 2m
========== CYCLE: 3 ========== Wed May  4 20:53:21 2022
264.18  0.00 <RESET by pin>
265.29  1.11 <WAKEUP by pin>
266.07  1.89      Ready
266.09  1.91 AT
266.12  1.94      OK
266.14  1.96 AT%XMODEMTRACE=1,2
266.17  1.99      OK
266.18  2.00 AT%MDMEV=1
266.21  2.03      OK
266.23  2.05 AT%HWVERSION
266.26  2.08      %HWVERSION: nRF9160 SICA B1A
266.28  2.10      OK
266.29  2.11 AT%SHORTSWVER
266.32  2.14      %SHORTSWVER: nrf9160_1.3.1
266.34  2.16      OK
266.35  2.18 AT%XPOFWARN=1,30
266.40  2.22      OK
266.42  2.24 AT%XSYSTEMMODE=1,0,0,1
266.46  2.28      OK
266.48  2.30 AT%REL14FEAT=1,1,1,1,0
266.51  2.33      OK
266.52  2.35 AT%RAI=1
266.56  2.38      OK
266.57  2.39 AT%XDATAPRFL=0
266.60  2.42      OK
266.62  2.44 AT%XSIM=1
266.65  2.47      OK
266.67  2.49 AT%XNETTIME=1
266.70  2.52      OK
266.71  2.53 AT+CEREG=5
266.74  2.57      OK
266.76  2.58 AT+CGEREP=1
266.79  2.61      OK
266.81  2.63 AT+CSCON=1
266.84  2.66      OK
266.85  2.67 AT+CPSMS=1,"","","00111000","00000000"
266.90  2.72      OK
266.92  2.74 AT+CNEC=24
266.95  2.77      OK
266.96  2.78 AT+CMEE=1
266.99  2.81      OK
267.01  2.83 AT+CEPPI=1
267.04  2.86      OK
267.06  2.88 AT#XSLEEP=2
267.09  2.91      OK
268.22  4.04 <WAKEUP by pin>
268.33  4.15      Ready
268.35  4.17 AT%XMODEMTRACE=1,2
268.38  4.20      OK
268.39  4.21 AT%XBANDLOCK=1,"0000000000000000000000000000000000000000000000000000000000001000000010000000100010011010"
268.44  4.26      OK
268.46  4.28 AT+COPS=0,2,"23003"
268.50  4.32      OK
268.52  4.34 AT+CGDCONT=1,"IP","hardwario.com"
268.57  4.39      OK
268.58  4.40 AT+CFUN=1
268.68  4.50      OK
269.88  5.70      %XSIM: 1
269.90  5.72 AT+CGSN
269.93  5.75      351358811477626
269.94  5.76      OK
269.96  5.78 AT+CIMI
269.99  5.81      204080813517083
270.00  5.82      OK
272.51  8.33      +CEREG: 2,"08FF","0201EE16",7
272.66  8.48      +CSCON: 1
275.57 11.39      +CGEV: ME PDN ACT 0,0
275.61 11.43      +CNEC_ESM: 50,0
275.64 11.46      %MDMEV: SEARCH STATUS 2
275.67 11.49      +CEREG: 5,"08FF","0201EE16",7,,,"11100000","11100000"
Wait 2m
========== CYCLE: 4 ========== Wed May  4 20:55:33 2022
396.01  0.00 <RESET by pin>
397.11  1.10 <WAKEUP by pin>
397.91  1.90      Ready
397.94  1.93 AT
397.97  1.96      OK
397.99  1.98 AT%XMODEMTRACE=1,2
398.02  2.01      OK
398.03  2.02 AT%MDMEV=1
398.07  2.05      OK
398.08  2.07 AT%HWVERSION
398.11  2.10      %HWVERSION: nRF9160 SICA B1A
398.13  2.12      OK
398.14  2.13 AT%SHORTSWVER
398.17  2.16      %SHORTSWVER: nrf9160_1.3.1
398.19  2.18      OK
398.20  2.19 AT%XPOFWARN=1,30
398.25  2.24      OK
398.27  2.26 AT%XSYSTEMMODE=1,0,0,1
398.31  2.30      OK
398.33  2.32 AT%REL14FEAT=1,1,1,1,0
398.36  2.35      OK
398.38  2.37 AT%RAI=1
398.41  2.40      OK
398.42  2.41 AT%XDATAPRFL=0
398.45  2.44      OK
398.47  2.46 AT%XSIM=1
398.50  2.49      OK
398.51  2.50 AT%XNETTIME=1
398.54  2.53      OK
398.56  2.55 AT+CEREG=5
398.59  2.58      OK
398.61  2.60 AT+CGEREP=1
398.64  2.63      OK
398.65  2.64 AT+CSCON=1
398.68  2.67      OK
398.70  2.69 AT+CPSMS=1,"","","00111000","00000000"
398.75  2.74      OK
398.76  2.75 AT+CNEC=24
398.79  2.78      OK
398.81  2.80 AT+CMEE=1
398.84  2.83      OK
398.85  2.84 AT+CEPPI=1
398.89  2.88      OK
398.90  2.89 AT#XSLEEP=2
398.93  2.92      OK
400.05  4.04 <WAKEUP by pin>
400.15  4.14      Ready
400.17  4.16 AT%XMODEMTRACE=1,2
400.20  4.19      OK
400.22  4.21 AT%XBANDLOCK=1,"0000000000000000000000000000000000000000000000000000000000001000000010000000100010011010"
400.27  4.25      OK
400.28  4.27 AT+COPS=0,2,"23003"
400.33  4.32      OK
400.34  4.33 AT+CGDCONT=1,"IP","hardwario.com"
400.39  4.38      OK
400.40  4.39 AT+CFUN=1
400.50  4.49      OK
401.71  5.70      %XSIM: 1
401.72  5.71 AT+CGSN
401.76  5.75      351358811477626
401.77  5.76      OK
401.79  5.78 AT+CIMI
401.82  5.81      204080813517083
401.83  5.82      OK
404.65  8.64      +CEREG: 2,"7AA9","01172803",7
404.68  8.67      +CSCON: 1
408.15 12.14      +CGEV: ME PDN ACT 0,0
408.18 12.17      +CNEC_ESM: 50,0
408.21 12.20      %MDMEV: SEARCH STATUS 2
408.24 12.23      +CEREG: 5,"7AA9","01172803",7,,,"00000000","00111000"
Wait 2m
========== CYCLE: 5 ========== Wed May  4 20:57:46 2022
528.59  0.00 <RESET by pin>
529.70  1.12 <WAKEUP by pin>
530.49  1.90      Ready
530.51  1.92 AT
530.54  1.95      OK
530.55  1.96 AT%XMODEMTRACE=1,2
530.58  2.00      OK
530.60  2.01 AT%MDMEV=1
530.63  2.04      OK
530.65  2.06 AT%HWVERSION
530.68  2.09      %HWVERSION: nRF9160 SICA B1A
530.69  2.11      OK
530.71  2.12 AT%SHORTSWVER
530.74  2.15      %SHORTSWVER: nrf9160_1.3.1
530.76  2.17      OK
530.77  2.18 AT%XPOFWARN=1,30
530.82  2.23      OK
530.83  2.25 AT%XSYSTEMMODE=1,0,0,1
530.88  2.29      OK
530.90  2.31 AT%REL14FEAT=1,1,1,1,0
530.93  2.34      OK
530.94  2.36 AT%RAI=1
530.98  2.39      OK
530.99  2.40 AT%XDATAPRFL=0
531.02  2.44      OK
531.04  2.45 AT%XSIM=1
531.07  2.48      OK
531.08  2.50 AT%XNETTIME=1
531.11  2.53      OK
531.13  2.54 AT+CEREG=5
531.16  2.57      OK
531.18  2.59 AT+CGEREP=1
531.21  2.62      OK
531.22  2.63 AT+CSCON=1
531.25  2.67      OK
531.27  2.68 AT+CPSMS=1,"","","00111000","00000000"
531.32  2.73      OK
531.33  2.74 AT+CNEC=24
531.36  2.78      OK
531.38  2.79 AT+CMEE=1
531.41  2.82      OK
531.43  2.84 AT+CEPPI=1
531.46  2.87      OK
531.47  2.89 AT#XSLEEP=2
531.51  2.92      OK
532.64  4.06 <WAKEUP by pin>
532.76  4.17      Ready
532.78  4.19 AT%XMODEMTRACE=1,2
532.81  4.22      OK
532.82  4.24 AT%XBANDLOCK=1,"0000000000000000000000000000000000000000000000000000000000001000000010000000100010011010"
532.87  4.28      OK
532.89  4.30 AT+COPS=0,2,"23003"
532.93  4.35      OK
532.95  4.36 AT+CGDCONT=1,"IP","hardwario.com"
532.99  4.41      OK
533.01  4.42 AT+CFUN=1
533.10  4.51      OK
534.32  5.73      %XSIM: 1
534.33  5.75 AT+CGSN
534.36  5.78      351358811477626
534.38  5.79      OK
534.40  5.81 AT+CIMI
534.43  5.84      204080813517083
534.44  5.86      OK
537.76  9.18      +CEREG: 2,"7AA9","01172803",7
537.79  9.21      +CSCON: 1
541.19 12.60      +CGEV: ME PDN ACT 0,0
541.22 12.63      +CNEC_ESM: 50,0
541.25 12.66      %MDMEV: SEARCH STATUS 2
541.28 12.69      +CEREG: 5,"7AA9","01172803",7,,,"00000000","00111000"
Wait 2m
========== CYCLE: 6 ========== Wed May  4 20:59:59 2022
661.63  0.00 <RESET by pin>
662.73  1.10 <WAKEUP by pin>
663.52  1.89      Ready
663.54  1.91 AT
663.57  1.94      OK
663.58  1.95 AT%XMODEMTRACE=1,2
663.61  1.98      OK
663.63  2.00 AT%MDMEV=1
663.66  2.03      OK
663.68  2.05 AT%HWVERSION
663.71  2.08      %HWVERSION: nRF9160 SICA B1A
663.72  2.09      OK
663.74  2.11 AT%SHORTSWVER
663.77  2.14      %SHORTSWVER: nrf9160_1.3.1
663.78  2.16      OK
663.80  2.17 AT%XPOFWARN=1,30
663.85  2.22      OK
663.86  2.23 AT%XSYSTEMMODE=1,0,0,1
663.91  2.28      OK
663.93  2.30 AT%REL14FEAT=1,1,1,1,0
663.96  2.33      OK
663.97  2.34 AT%RAI=1
664.00  2.37      OK
664.02  2.39 AT%XDATAPRFL=0
664.05  2.42      OK
664.07  2.44 AT%XSIM=1
664.10  2.47      OK
664.11  2.49 AT%XNETTIME=1
664.15  2.52      OK
664.16  2.53 AT+CEREG=5
664.19  2.56      OK
664.21  2.58 AT+CGEREP=1
664.24  2.61      OK
664.25  2.63 AT+CSCON=1
664.29  2.66      OK
664.30  2.67 AT+CPSMS=1,"","","00111000","00000000"
664.35  2.72      OK
664.36  2.73 AT+CNEC=24
664.40  2.77      OK
664.41  2.78 AT+CMEE=1
664.44  2.81      OK
664.46  2.83 AT+CEPPI=1
664.49  2.86      OK
664.50  2.87 AT#XSLEEP=2
664.53  2.91      OK
665.66  4.03 <WAKEUP by pin>
665.77  4.14      Ready
665.78  4.15 AT%XMODEMTRACE=1,2
665.81  4.18      OK
665.83  4.20 AT%XBANDLOCK=1,"0000000000000000000000000000000000000000000000000000000000001000000010000000100010011010"
665.87  4.25      OK
665.89  4.26 AT+COPS=0,2,"23003"
665.94  4.31      OK
665.95  4.32 AT+CGDCONT=1,"IP","hardwario.com"
666.00  4.37      OK
666.02  4.39 AT+CFUN=1
666.11  4.48      OK
667.32  5.69      %XSIM: 1
667.33  5.71 AT+CGSN
667.37  5.74      351358811477626
667.38  5.75      OK
667.40  5.77 AT+CIMI
667.43  5.80      204080813517083
667.44  5.82      OK
670.16  8.53      +CEREG: 2,"08FF","0201EE16",7
670.19  8.56      +CSCON: 1
672.78 11.15      +CGEV: ME PDN ACT 0,0
672.81 11.18      +CNEC_ESM: 50,0
672.84 11.21      %MDMEV: SEARCH STATUS 2
672.87 11.24      +CEREG: 5,"08FF","0201EE16",7,,,"11100000","11100000"
Wait 2m
========== CYCLE: 7 ========== Wed May  4 21:02:10 2022
793.21  0.00 <RESET by pin>
794.32  1.10 <WAKEUP by pin>
795.11  1.90      Ready
795.12  1.91 AT
795.16  1.94      OK
795.17  1.96 AT%XMODEMTRACE=1,2
795.20  1.99      OK
795.22  2.01 AT%MDMEV=1
795.25  2.04      OK
795.26  2.05 AT%HWVERSION
795.30  2.08      %HWVERSION: nRF9160 SICA B1A
795.31  2.10      OK
795.33  2.12 AT%SHORTSWVER
795.36  2.15      %SHORTSWVER: nrf9160_1.3.1
795.37  2.16      OK
795.39  2.18 AT%XPOFWARN=1,30
795.44  2.22      OK
795.45  2.24 AT%XSYSTEMMODE=1,0,0,1
795.50  2.29      OK
795.51  2.30 AT%REL14FEAT=1,1,1,1,0
795.54  2.33      OK
795.56  2.35 AT%RAI=1
795.59  2.38      OK
795.61  2.40 AT%XDATAPRFL=0
795.64  2.43      OK
795.66  2.44 AT%XSIM=1
795.69  2.47      OK
795.70  2.49 AT%XNETTIME=1
795.73  2.52      OK
795.75  2.54 AT+CEREG=5
795.78  2.57      OK
795.80  2.58 AT+CGEREP=1
795.83  2.61      OK
795.84  2.63 AT+CSCON=1
795.87  2.66      OK
795.89  2.68 AT+CPSMS=1,"","","00111000","00000000"
795.94  2.72      OK
795.95  2.74 AT+CNEC=24
795.98  2.77      OK
796.00  2.78 AT+CMEE=1
796.03  2.82      OK
796.04  2.83 AT+CEPPI=1
796.07  2.86      OK
796.09  2.88 AT#XSLEEP=2
796.12  2.91      OK
797.25  4.04 <WAKEUP by pin>
797.36  4.14      Ready
797.37  4.16 AT%XMODEMTRACE=1,2
797.40  4.19      OK
797.42  4.21 AT%XBANDLOCK=1,"0000000000000000000000000000000000000000000000000000000000001000000010000000100010011010"
797.46  4.25      OK
797.48  4.27 AT+COPS=0,2,"23003"
797.53  4.31      OK
797.54  4.33 AT+CGDCONT=1,"IP","hardwario.com"
797.59  4.38      OK
797.61  4.39 AT+CFUN=1
797.70  4.49      OK
798.91  5.70      %XSIM: 1
798.93  5.72 AT+CGSN
798.96  5.75      351358811477626
798.98  5.76      OK
798.99  5.78 AT+CIMI
799.02  5.81      204080813517083
799.04  5.83      OK
802.11  8.90      +CEREG: 2,"7AA9","01172803",7
Wait 2m
Reset reset loop
922.44  0.00 <RESET by pin>
Wait 35m
3022.75  0.00 <RESET by pin>
3023.87  1.12 <WAKEUP by pin>
3024.66  1.91      Ready
3024.68  1.92 AT
3024.71  1.95      OK
3024.72  1.97 AT%XMODEMTRACE=1,2
3024.75  2.00      OK
3024.77  2.02 AT%MDMEV=1
3024.80  2.05      OK
3024.81  2.06 AT%HWVERSION
3024.85  2.09      %HWVERSION: nRF9160 SICA B1A
3024.86  2.11      OK
3024.88  2.12 AT%SHORTSWVER
3024.91  2.15      %SHORTSWVER: nrf9160_1.3.1
3024.92  2.17      OK
3024.94  2.19 AT%XPOFWARN=1,30
3024.98  2.23      OK
3025.00  2.25 AT%XSYSTEMMODE=1,0,0,1
3025.05  2.29      OK
3025.06  2.31 AT%REL14FEAT=1,1,1,1,0
3025.09  2.34      OK
3025.11  2.36 AT%RAI=1
3025.14  2.39      OK
3025.16  2.41 AT%XDATAPRFL=0
3025.19  2.44      OK
3025.21  2.45 AT%XSIM=1
3025.24  2.48      OK
3025.25  2.50 AT%XNETTIME=1
3025.28  2.53      OK
3025.30  2.55 AT+CEREG=5
3025.33  2.58      OK
3025.35  2.59 AT+CGEREP=1
3025.38  2.62      OK
3025.39  2.64 AT+CSCON=1
3025.42  2.67      OK
3025.44  2.69 AT+CPSMS=1,"","","00111000","00000000"
3025.49  2.73      OK
3025.50  2.75 AT+CNEC=24
3025.53  2.78      OK
3025.55  2.80 AT+CMEE=1
3025.58  2.83      OK
3025.60  2.85 AT+CEPPI=1
3025.63  2.88      OK
3025.64  2.89 AT#XSLEEP=2
3025.68  2.92      OK
3026.81  4.06 <WAKEUP by pin>
3026.92  4.17      Ready
3026.94  4.18 AT%XMODEMTRACE=1,2
3026.97  4.21      OK
3026.98  4.23 AT%XBANDLOCK=1,"0000000000000000000000000000000000000000000000000000000000001000000010000000100010011010"
3027.03  4.28      OK
3027.04  4.29 AT+COPS=0,2,"23003"
3027.09  4.34      OK
3027.11  4.35 AT+CGDCONT=1,"IP","hardwario.com"
3027.14  4.39      OK
3027.15  4.40 AT+CFUN=1
3027.25  4.50      OK
3028.45  5.70      %XSIM: 1
3028.47  5.72 AT+CGSN
3028.50  5.75      351358811477626
3028.52  5.76      OK
3028.53  5.78 AT+CIMI
3028.56  5.81      204080813517083
3028.58  5.83      OK
3031.79  9.04      +CEREG: 2,"7AA9","01172803",7
3032.03  9.28      +CSCON: 1
3035.68 12.93      +CGEV: ME PDN ACT 0,0
3035.71 12.96      +CNEC_ESM: 50,0
3035.74 12.99      %MDMEV: SEARCH STATUS 2
3035.78 13.02      +CEREG: 5,"7AA9","01172803",7,,,"00000000","00111000"

I did not receive %MDMEV: RESET LOOP

Kind regards,
Øyvind

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

Michal Mühlpachr — Tue, 03 May 2022 13:28:01 GMT

Hi Øyvind,

Make sure you have FTDI cable with 3V levels (not 5V) and that SW9 VDD IO is set to 3V (not default 1,8V).

DTR is https://en.wikipedia.org/wiki/Data_Terminal_Ready
DTR and RTS can be used as general purpose outputs on DCE , have a look e.g. at UART https://stackoverflow.com/questions/957337/what-is-the-difference-between-dtr-dsr-and-rts-cts-flow-control

You can use RTS instead of DTR, in such case instead of control_uart.dtr use control_uart.rts in script.

Lines 132, 134 and 179

Documentation for pyserial is at https://pyserial.readthedocs.io/en/latest/pyserial_api.html#serial.Serial.rts

USB-to-UART bridge is used just as tool to control two general purpose outputs from script in PC (so it not used as UART).
nRF9160DK do not have such capability AFAIK.

TXD is used to control RESET of nRF9160 (by sending BREAK to UART - it creates pulse on TXD).
DTR (or RTS in your case) is used to control WAKEUP PIN of nRF9160.

Reason for remote control of RESET pin and WAKEUP pin is automation of scenarios, otherwise you would need to push buttons by hand in defined moments - it is not joy ;-)

In addition by automating RESET and WAKEUP signals we have more precise timing and less human errors (100% repeatability).

Regards,

Michal

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

Øyvind — Tue, 03 May 2022 12:22:55 GMT

Hi Michal,

I've finally got hold of an FTDI cable FT232RQ. This is not something our tech support team uses that much. Could you please elaborate more on how I should connect this in regards to your script.

# There is USB-to-UART bridge in addition to nRF9160DK to control RESET and WAKEUP pins of nRF9160
# e.g. CP2102, CP2104, CP2102N, FT230X, FT231X, FT232X
# nRF9160 SB16 shorted to bring RESET button to connector P1 on nRF9160DK
# P1 RESET wired to control_uart TXD
# P3 P0.06 wired to control_uart DTR

What is the reason for shorting ? And what is DTR?

Thanks.

-Øyvind

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

Michal Mühlpachr — Thu, 07 Apr 2022 17:49:17 GMT

OK, thank you, let me know in case you need an additional info please.
Do not forget to set SW9 VDD IO switch on nRF9160DK to 3V position.

Kind regards,
Michal

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

Øyvind — Thu, 07 Apr 2022 12:02:42 GMT

Thanks for providing this. I will need some time to reproduce this, as next week is Easter Holiday our tech support team will be shorter staffed.

Sorry for the inconvenience.

Kind regards,
Øyvind

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

Michal Mühlpachr — Wed, 06 Apr 2022 13:33:54 GMT

Hello Øyvind,

I prepared simple Python script to demonstrate both issues (120+ delay does not work, 35+m delay does not work).

Python script and its AT dialogue log is published here https://gist.github.com/muhlpachr/fc6fbafa392cc1dd384437e797ebfc3a

Collected trace from that run:

devzone.nordicsemi.com/.../trace_2D00_2022_2D00_04_2D00_06T12_2D00_31_2D00_45.838Z.bin

Feel free to keep ticket public.

Let me know what can I do more to help troubleshoot both issues.

Regards,
Michal

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

Øyvind — Wed, 06 Apr 2022 08:33:17 GMT

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

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

Øyvind — Wed, 06 Apr 2022 05:35:49 GMT

[quote user="michalm"]I collected trace again together with AT dialogue log, both are below.[/quote]

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

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

Øyvind — Wed, 06 Apr 2022 05:25:47 GMT

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

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

Michal Mühlpachr — Tue, 05 Apr 2022 23:44:30 GMT

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.

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

Michal Mühlpachr — Tue, 05 Apr 2022 22:31:42 GMT

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

devzone.nordicsemi.com/.../trace_2D00_2022_2D00_04_2D00_05T22_2D00_07_2D00_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

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

Michal Mühlpachr — Tue, 05 Apr 2022 11:08:46 GMT

Hello again,

this trace is not from trace-2022-03-28T21-28-11.914Z.bin unfortunately who was collected to show that even 120+ seconds does not help.

Would you be so kind and check correct trace please ?

Regards,
Michal

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

Øyvind — Tue, 05 Apr 2022 07:24:10 GMT

Hello again,

I've got some feedback based on the last modem trace that you provided. From this our nRF91 team has the following feedback:

Based on the log, the device does not wait 60s+ after successful Attach before triggering reset.
00:00:17.284606  NAS_PDU_ATTACH_COMPLETE_W_ACTIVATE_DEFAULT_EPS_BEARER_CONTEXT_ACCEPT [074300035200C2] 
00:00:29.912078 L23_AT_STRING AT_STRING => +CFUN=1 
00:00:37.004303  NAS_PDU_ATTACH_COMPLETE_W_ACTIVATE_DEFAULT_EPS_BEARER_CONTEXT_ACCEPT [074300035200C2] 
00:00:47.108367 L23_AT_STRING AT_STRING => +CFUN=1 
00:00:54.326721  NAS_PDU_ATTACH_COMPLETE_W_ACTIVATE_DEFAULT_EPS_BEARER_CONTEXT_ACCEPT [074300035200C2] 
00:01:04.556671 L23_AT_STRING AT_STRING => +CFUN=1 
00:01:11.758941  NAS_PDU_ATTACH_COMPLETE_W_ACTIVATE_DEFAULT_EPS_BEARER_CONTEXT_ACCEPT [074300035200C2] 
00:01:22.482543 L23_AT_STRING AT_STRING => +CFUN=1 
00:01:29.760192  NAS_PDU_ATTACH_COMPLETE_W_ACTIVATE_DEFAULT_EPS_BEARER_CONTEXT_ACCEPT [074300035200C2] 
00:01:40.499420 L23_AT_STRING AT_STRING => +CFUN=1 
00:02:05.188568  NAS_PDU_ATTACH_COMPLETE_W_ACTIVATE_DEFAULT_EPS_BEARER_CONTEXT_ACCEPT [074300035200C2] 
00:02:17.234619 L23_AT_STRING AT_STRING => +CFUN=1 
This is the reason why the reset counter keeps increasing until there has been 7 resets. At that point the reset loop restriction is activated. You need to ensure that you wait at least 60 seconds after successful Attach before triggering the reset. This is to ensure that the reset counter does not increase.

It is also possible to clear an active reset loop restriction by factory reset.

Based on this information, our nRF91 team informs me that you need

Wait at least 60 seconds before reset OR
Count each attaches and then wait 60 seconds after 4th successful attach. (+CGATT)
If above is not possible, do a factory reset (%XFACTORYRESET) after the RESET LOOP hits during 7th attach attempt

Kind regards,
Øyvind

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

Øyvind — Mon, 04 Apr 2022 11:12:42 GMT

Thanks for providing this clarification. I've forwarded this to our modem team.

Kind regards,
Øyvind

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

Michal Mühlpachr — Fri, 01 Apr 2022 21:23:27 GMT

The reason why we are resetting nRF91 is development cycle.

In our HW nRF91 with SLM is controlled by host MCU nRF52. When nRF52 is flashed and new version of our application starts to execute, it needs to transit nRF9160/SLM in guaranteed known state at startup, so it resets nRF91 during startup by pin.

We suppose it is not wise to start nRF91 initialization by +CFUN=0 because:
1. it would store plenty of undefined configuration in nRF91 NVM
2. since nRF91 NVM is implemented in flash, it would wear nRF91 flash fast during app development and tests on nRF52 (e.g. application on nRF52 can be restarted by Zephyr shell command)

It is not feasible to power-cycle our HW during app development because there are supercaps and constant current power source to protect batteries (it operate from bench PSU during development but current limit circuity is active all the time even during development - is has to, to properly test HW+SW) and those discharge-charge supercaps cycle takes time.

We would take pain and wait 60+ seconds at application startup during development cycle but it does not help to prevent RESET LOOP protection because nRF91/SLM does not behave like it is described/supposed.

Comment/info from developers is not related to collected trace in any manner (there are 120+ seconds delays after modem initialization between RESETs on nRF91), it just describes how nRF91 is supposed to behave.

It is not the case unfortunately and it is obvious from trace, I do not know how to prove it more.
Why you can not see it from trace please ?

What other development cycle do you propose to prevent RESET LOOP and guarantee proper deterministic nRF91 initialization please ?

Please understand that we do require proper and convenient development cycle and we do not know how to that because nRF91 does not behave according description from developers and modem source code is closed, so do not have any other affordable way how to find way than asking for support.

Kind regards,
Michal

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

Øyvind — Fri, 01 Apr 2022 10:37:26 GMT

Hi Michal,

our developers did have a look at the modem trace, and they did repspond with the last clarification.

What are the reasons for why you are resetting the device? Our developers write:

If they want to avoid the reset loop restriction, they have to wait 60+ seconds after modem initialization before triggering the reset. This way modem's reset counter will not ever reach the limit and trigger the creation of the reset loop restriction.

Please understand that reset loop is a safety mechanism and is not supposed to be entered if the device is behaving "in a good way".

Kind regards,
Øyvind

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

Michal Mühlpachr — Thu, 31 Mar 2022 20:35:22 GMT

Hi,

have a look in trace-2022-03-28T21-28-11.914Z.bin.
More than 120s between RESETs does not reset the internal reset counter.
Can you check why 60 seconds timer does not work as expected please ?

Can you check, why 30 minutes timer works with modem trace enabled but does not work without modem trace please ?

Thank you.

Regards,
Michal

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

Øyvind — Thu, 31 Mar 2022 12:44:07 GMT

Hello,

Our nRF91 team have look at the issue and respond with following clarification:

When the reset loop restriction has been activated due to maximum number of resets, that is 7 resets, it will be instantly stored to NVM and after that there is no way to get around it.
The restriction is active and nothing else can be done other than wait (with the device powered) for 30 minutes. While waiting, if the reset occurs again the timer starts again with the last stored remaining value. Note that NVM will be updated with the remaining value always at CFUN=0. If CFUN=0 has not been commanded and the device resets again, then the restriction timer will start with the initial value again at power up, i.e. the restriction will be active for the next 30 minutes.
The mentioned 60 seconds timer does reset the internal reset counter. So, if there is no resets during 1 minute the counter will be reset and again 7 new resets are needed for activating the actual reset loop restriction. NOTE: This has no effect to possibly already existing reset loop restriction.
The reset counter is also always reset at CFUN=0, i.e. when application gracefully switches off the modem. NOTE: This has no effect to possibly already existing reset loop restriction.
After the reset loop restriction is over, modem will automatically initiate Attach procedure if suitable cell is available. Note that if client triggers reset at this point, the old restriction is still at the NVM and will stand up again at the next startup. Using CFUN=0 instead will update the NVM and remove the old stored restriction.
Modem events need to be subscribed for receiving notification of reset loop restriction (AT%MDMEV=1). The subscription does not persist over resets nor modem de-initialization.

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

Øyvind — Thu, 31 Mar 2022 08:19:48 GMT

Hello, I have forwarded your issue to our nRF91 team. I hope to have an update by end of today or tomorrow.

Kind regards,
Øyvind

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

Michal Mühlpachr — Mon, 28 Mar 2022 22:29:19 GMT

Hi,

with modem trace enabled I am not able to reproduce RESET LOOP after 40m or 1h.
I am able to reproduce it only without modem trace. Sequence is same as below.

But I am able to reproduce, that even with 2minutes delay between RESETs I am still getting RESET LOOP in 7th cycle after power cycle. Modem trace is attached.

Regads,

Michaldevzone.nordicsemi.com/.../trace_2D00_2022_2D00_03_2D00_28T21_2D00_28_2D00_11.914Z.bin

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

Øyvind — Mon, 28 Mar 2022 08:29:04 GMT

Hello,
can you please provide a new modem trace and log from the updated scenario?

[quote user="michalm"]But it is strange to get OK for +CFUN=1 while in RESET LOOP.[/quote]

Note that changing function of modem is not equivalent to network attach. Do you use AT+CFUN=0 to gracefully shut down modem?

Thanks.
Kind regards,
Øyvind

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

Michal Mühlpachr — Fri, 25 Mar 2022 15:19:32 GMT

It is clear, that without %MDMEV=1 we do not get URC. But it is strange to get OK for +CFUN=1 while in RESET LOOP.

I just tested to try attach 1h after %MDMEV: RESET LOOP URC, but I am still getting %MDMEV: RESET LOOP. It does not behave according https://infocenter.nordicsemi.com/index.jsp?topic=%2Fref_at_commands%2FREF%2Fat_commands%2Fmob_termination_ctrl_status%2Fmdmev_set.html

Modem was powered whole 1h and RESETed by pin with CONFIG_SLM_START_SLEEP=y in SLM at the beginning of 1h and at the beginning of next try. Remaining time was not stored in NVM, because after power cycle, modem attaches immediately. Why 30 minutes timeout do not apply ?

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

Øyvind — Fri, 25 Mar 2022 14:07:04 GMT

Hi,

[quote user="michalm"]Why there is not ERROR reported by modem while in RESET LOOP after +CFUN=1 ?[/quote]

I assume that this is due to not subscribing to the modem domain event notification.

[quote user="michalm"]Is 60 seconds delay between RESETs mentioned anywhere in documentation please ?[/quote]

No, looks like this is not documented from what I can see.

Kind regards,
Øyvind

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

Michal Mühlpachr — Fri, 25 Mar 2022 12:53:22 GMT

Hello Øyvind,

yes, it is %MDMEV: RESET LOOP, we were not aware of nRF9160 Modem Reset Loop Restriction functionality.

Is 60 seconds delay between RESETs mentioned anywhere in documentation please ?

Why there is not ERROR reported by modem while in RESET LOOP after +CFUN=1 ?

Thank you.

Regards,
Michal

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

Øyvind — Fri, 25 Mar 2022 12:42:58 GMT

Please try with more than 60 seconds between each reset. This is most likely due to the reset loop restriction which will count every reset done within 60 seconds.