AT_CLIENT connects but SERIAL_LTE_MODEM does not connect to network

Is there a reason that AT_CLIENT example always works for LTE but SERIAL_LTE_MODEM only works the first time, and then trying again it never connects to the LTE ? Typing AT+CFUN=1 on both to get things started. IDE is 1.7.0 with no modifications to the code.

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0 Albrecht Markus Schellenberger over 4 years ago

Hello Gerry,

As I’m not able to reproduce this on my side, could you please provide me with a full application log covering the behaviour you described?

Thanks and regards,

Markus
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0 Albrecht Markus Schellenberger over 4 years ago

Hello Gerry,

As I’m not able to reproduce this on my side, could you please provide me with a full application log covering the behaviour you described?

Thanks and regards,

Markus
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0 GerryB over 4 years ago in reply to Albrecht Markus Schellenberger

OK here are the two logs, the first for AT_CLIENT and the next one for SLM (Serial LTE Modem). I x'd out a few of the characters in the SIM identity for privacy, but this is it:

AT_CLIENT:

2021-10-04T20:33:28.444Z DEBUG modem << The AT host sample started
2021-10-04T20:33:35.829Z INFO Modem port is closed
2021-10-04T20:33:35.839Z INFO Modem port is opened
2021-10-04T20:33:35.845Z DEBUG modem >> AT+CFUN?
2021-10-04T20:33:35.860Z DEBUG modem << +CFUN: 0
2021-10-04T20:33:35.861Z DEBUG modem << OK
2021-10-04T20:33:40.936Z DEBUG modem >> AT+CFUN=1
2021-10-04T20:33:40.978Z DEBUG modem << OK
2021-10-04T20:33:42.588Z DEBUG modem >> AT+CFUN?
2021-10-04T20:33:42.596Z DEBUG modem << +CFUN: 1
2021-10-04T20:33:42.599Z DEBUG modem << OK
2021-10-04T20:33:42.600Z DEBUG modem >> AT+CGSN=1
2021-10-04T20:33:42.613Z DEBUG modem << +CGSN: "352656109853344"
2021-10-04T20:33:42.614Z DEBUG modem << OK
2021-10-04T20:33:42.617Z DEBUG modem >> AT+CGMI
2021-10-04T20:33:42.630Z DEBUG modem << Nordic Semiconductor ASA
2021-10-04T20:33:42.631Z DEBUG modem << OK
2021-10-04T20:33:42.634Z DEBUG modem >> AT+CGMM
2021-10-04T20:33:42.646Z DEBUG modem << nRF9160-SICA
2021-10-04T20:33:42.648Z DEBUG modem << OK
2021-10-04T20:33:42.651Z DEBUG modem >> AT+CGMR
2021-10-04T20:33:42.663Z DEBUG modem << mfw_nrf9160_1.2.3
2021-10-04T20:33:42.664Z DEBUG modem << OK
2021-10-04T20:33:42.665Z INFO Nordic Semiconductor ASA nRF9160-SICA [mfw_nrf9160_1.2.3] SerNr: 352656109853344
2021-10-04T20:33:42.667Z DEBUG modem >> AT+CEMODE?
2021-10-04T20:33:42.680Z DEBUG modem << +CEMODE: 2
2021-10-04T20:33:42.681Z DEBUG modem << OK
2021-10-04T20:33:42.684Z DEBUG modem >> AT%XCBAND=?
2021-10-04T20:33:42.697Z DEBUG modem << %XCBAND: (1,2,3,4,5,8,12,13,18,19,20,25,26,28,66)
2021-10-04T20:33:42.698Z DEBUG modem << OK
2021-10-04T20:33:42.701Z DEBUG modem >> AT+CMEE?
2021-10-04T20:33:42.714Z DEBUG modem << +CMEE: 0
2021-10-04T20:33:42.715Z DEBUG modem << OK
2021-10-04T20:33:42.718Z DEBUG modem >> AT+CMEE=1
2021-10-04T20:33:42.730Z DEBUG modem << OK
2021-10-04T20:33:42.733Z DEBUG modem >> AT+CNEC?
2021-10-04T20:33:42.741Z DEBUG modem << +CNEC: 0
2021-10-04T20:33:42.742Z DEBUG modem << OK
2021-10-04T20:33:42.749Z DEBUG modem >> AT+CNEC=24
2021-10-04T20:33:42.755Z DEBUG modem << OK
2021-10-04T20:33:42.757Z DEBUG modem >> AT+CGEREP?
2021-10-04T20:33:42.764Z DEBUG modem << +CGEREP: 0,0
2021-10-04T20:33:42.765Z DEBUG modem << OK
2021-10-04T20:33:42.768Z DEBUG modem >> AT+CGDCONT?
2021-10-04T20:33:42.774Z DEBUG modem << OK
2021-10-04T20:33:42.781Z DEBUG modem >> AT+CGACT?
2021-10-04T20:33:42.787Z DEBUG modem << OK
2021-10-04T20:33:42.809Z DEBUG modem >> AT+CGEREP=1
2021-10-04T20:33:42.815Z DEBUG modem << OK
2021-10-04T20:33:42.818Z DEBUG modem >> AT+CIND=1,1,1
2021-10-04T20:33:42.831Z DEBUG modem << OK
2021-10-04T20:33:42.834Z DEBUG modem >> AT+CEREG=5
2021-10-04T20:33:42.840Z DEBUG modem << OK
2021-10-04T20:33:42.848Z DEBUG modem >> AT+CEREG?
2021-10-04T20:33:42.864Z DEBUG modem << +CEREG: 5,4,"FFFE","FFFFFFFF",7,0,0,"00000000","00000000"
2021-10-04T20:33:42.865Z DEBUG modem << OK
2021-10-04T20:33:42.869Z DEBUG modem >> AT%CESQ=1
2021-10-04T20:33:42.881Z DEBUG modem << OK
2021-10-04T20:33:42.884Z DEBUG modem >> AT+CESQ
2021-10-04T20:33:42.897Z DEBUG modem << +CESQ: 99,99,255,255,255,255
2021-10-04T20:33:42.898Z DEBUG modem << OK
2021-10-04T20:33:42.901Z DEBUG modem >> AT%XSIM=1
2021-10-04T20:33:42.907Z DEBUG modem << OK
2021-10-04T20:33:42.914Z DEBUG modem >> AT%XSIM?
2021-10-04T20:33:42.921Z DEBUG modem << %XSIM: 1
2021-10-04T20:33:42.922Z DEBUG modem << OK
2021-10-04T20:33:42.932Z DEBUG modem >> AT+CPIN?
2021-10-04T20:33:42.940Z DEBUG modem << +CPIN: READY
2021-10-04T20:33:42.941Z DEBUG modem << OK
2021-10-04T20:33:42.951Z DEBUG modem >> AT+CPINR="SIM PIN"
2021-10-04T20:33:42.966Z DEBUG modem << +CPINR: "SIM PIN",3
2021-10-04T20:33:42.967Z DEBUG modem << OK
2021-10-04T20:33:42.969Z DEBUG modem >> AT+CIMI
2021-10-04T20:33:42.981Z DEBUG modem << 3026xxxxxxx8958
2021-10-04T20:33:42.982Z DEBUG modem << OK
2021-10-04T20:33:42.984Z INFO IMSIdentity: 3026xxxxxxx8958
2021-10-04T20:33:43.901Z DEBUG modem << %CESQ: 42,2,3,0
2021-10-04T20:33:43.931Z DEBUG modem << +CEREG: 2,"2D83","01D11B0A",7,0,0,"11100000","11100000"
2021-10-04T20:33:45.232Z DEBUG modem << +CGEV: ME PDN ACT 0,0
2021-10-04T20:33:45.244Z DEBUG modem << +CNEC_ESM: 50,0
2021-10-04T20:33:45.269Z DEBUG modem >> AT+CGDCONT?
2021-10-04T20:33:45.272Z DEBUG modem << +CEREG: 1,"2D83","01D11B0A",7,,,"11100000","11100000"
2021-10-04T20:33:45.274Z DEBUG modem << +CIND: "service",1
2021-10-04T20:33:45.286Z DEBUG modem << +CGDCONT: 0,"IP","mnet.bell.ca.ioe","10.169.167.185",0,0
2021-10-04T20:33:45.287Z DEBUG modem << OK
2021-10-04T20:33:45.298Z DEBUG modem >> AT+CGACT?
2021-10-04T20:33:45.306Z DEBUG modem << +CGACT: 0,1
2021-10-04T20:33:45.306Z DEBUG modem << OK

SLM :

2021-10-04T20:28:26.154Z DEBUG modem << Ready
2021-10-04T20:28:31.585Z INFO Modem port is closed
2021-10-04T20:28:31.601Z INFO Modem port is opened
2021-10-04T20:28:31.604Z DEBUG modem >> AT+CFUN?
2021-10-04T20:28:31.620Z DEBUG modem << +CFUN: 0
2021-10-04T20:28:31.622Z DEBUG modem << OK
2021-10-04T20:28:34.005Z DEBUG modem >> AT+CFUN=1
2021-10-04T20:28:34.051Z DEBUG modem << OK
2021-10-04T20:28:35.795Z DEBUG modem >> AT+CFUN?
2021-10-04T20:28:35.804Z DEBUG modem << +CFUN: 1
2021-10-04T20:28:35.808Z DEBUG modem << OK
2021-10-04T20:28:35.810Z DEBUG modem >> AT+CGSN=1
2021-10-04T20:28:35.820Z DEBUG modem << +CGSN: "352656109853344"
2021-10-04T20:28:35.821Z DEBUG modem << OK
2021-10-04T20:28:35.825Z DEBUG modem >> AT+CGMI
2021-10-04T20:28:35.835Z DEBUG modem << Nordic Semiconductor ASA
2021-10-04T20:28:35.836Z DEBUG modem << OK
2021-10-04T20:28:35.839Z DEBUG modem >> AT+CGMM
2021-10-04T20:28:35.852Z DEBUG modem << nRF9160-SICA
2021-10-04T20:28:35.853Z DEBUG modem << OK
2021-10-04T20:28:35.856Z DEBUG modem >> AT+CGMR
2021-10-04T20:28:35.865Z DEBUG modem << mfw_nrf9160_1.2.3
2021-10-04T20:28:35.866Z DEBUG modem << OK
2021-10-04T20:28:35.867Z INFO Nordic Semiconductor ASA nRF9160-SICA [mfw_nrf9160_1.2.3] SerNr: 352656109853344
2021-10-04T20:28:35.871Z DEBUG modem >> AT+CEMODE?
2021-10-04T20:28:35.881Z DEBUG modem << +CEMODE: 2
2021-10-04T20:28:35.882Z DEBUG modem << OK
2021-10-04T20:28:35.890Z DEBUG modem >> AT%XCBAND=?
2021-10-04T20:28:35.903Z DEBUG modem << %XCBAND: (1,2,3,4,5,8,12,13,18,19,20,25,26,28,66)
2021-10-04T20:28:35.904Z DEBUG modem << OK
2021-10-04T20:28:35.909Z DEBUG modem >> AT+CMEE?
2021-10-04T20:28:35.919Z DEBUG modem << +CMEE: 0
2021-10-04T20:28:35.921Z DEBUG modem << OK
2021-10-04T20:28:35.924Z DEBUG modem >> AT+CMEE=1
2021-10-04T20:28:35.935Z DEBUG modem << OK
2021-10-04T20:28:35.939Z DEBUG modem >> AT+CNEC?
2021-10-04T20:28:35.948Z DEBUG modem << +CNEC: 0
2021-10-04T20:28:35.949Z DEBUG modem << OK
2021-10-04T20:28:35.953Z DEBUG modem >> AT+CNEC=24
2021-10-04T20:28:35.961Z DEBUG modem << OK
2021-10-04T20:28:35.964Z DEBUG modem >> AT+CGEREP?
2021-10-04T20:28:35.974Z DEBUG modem << +CGEREP: 0,0
2021-10-04T20:28:35.975Z DEBUG modem << OK
2021-10-04T20:28:35.978Z DEBUG modem >> AT+CGDCONT?
2021-10-04T20:28:35.985Z DEBUG modem << OK
2021-10-04T20:28:35.988Z DEBUG modem >> AT+CGACT?
2021-10-04T20:28:35.996Z DEBUG modem << OK
2021-10-04T20:28:36.002Z DEBUG modem >> AT+CGEREP=1
2021-10-04T20:28:36.009Z DEBUG modem << OK
2021-10-04T20:28:36.013Z DEBUG modem >> AT+CIND=1,1,1
2021-10-04T20:28:36.021Z DEBUG modem << OK
2021-10-04T20:28:36.024Z DEBUG modem >> AT+CEREG=5
2021-10-04T20:28:36.035Z DEBUG modem << OK
2021-10-04T20:28:36.038Z DEBUG modem >> AT+CEREG?
2021-10-04T20:28:36.052Z DEBUG modem << +CEREG: 5,4,"FFFE","FFFFFFFF",7,0,0,"00000000","00000000"
2021-10-04T20:28:36.054Z DEBUG modem << OK
2021-10-04T20:28:36.058Z DEBUG modem >> AT%CESQ=1
2021-10-04T20:28:36.069Z DEBUG modem << OK
2021-10-04T20:28:36.072Z DEBUG modem >> AT+CESQ
2021-10-04T20:28:36.085Z DEBUG modem << +CESQ: 99,99,255,255,255,255
2021-10-04T20:28:36.086Z DEBUG modem << OK
2021-10-04T20:28:36.090Z DEBUG modem >> AT%XSIM=1
2021-10-04T20:28:36.097Z DEBUG modem << OK
2021-10-04T20:28:36.102Z DEBUG modem >> AT%XSIM?
2021-10-04T20:28:36.112Z DEBUG modem << %XSIM: 1
2021-10-04T20:28:36.113Z DEBUG modem << OK
2021-10-04T20:28:36.121Z DEBUG modem >> AT+CPIN?
2021-10-04T20:28:36.131Z DEBUG modem << +CPIN: READY
2021-10-04T20:28:36.132Z DEBUG modem << OK
2021-10-04T20:28:36.139Z DEBUG modem >> AT+CPINR="SIM PIN"
2021-10-04T20:28:36.155Z DEBUG modem << +CPINR: "SIM PIN",3
2021-10-04T20:28:36.156Z DEBUG modem << OK
2021-10-04T20:28:36.159Z DEBUG modem >> AT+CIMI
2021-10-04T20:28:36.169Z DEBUG modem << 3026xxxxxxx8958
2021-10-04T20:28:36.170Z DEBUG modem << OK
2021-10-04T20:28:36.171Z INFO IMSIdentity: 3026xxxxxxx8958
2021-10-04T20:28:37.140Z DEBUG modem << %CESQ: 39,1,0,0
2021-10-04T20:28:37.151Z DEBUG modem << +CEREG: 2,"2D83","01D1860A",7,0,0,"11100000","11100000"
2021-10-04T20:28:37.361Z DEBUG modem << +CNEC_ESM: 111,0
2021-10-04T20:28:37.378Z DEBUG modem << +CNEC_EMM: 17
2021-10-04T20:28:37.391Z DEBUG modem << +CEREG: 2,"2D83","01D1860A",7,0,17,"11100000","11100000"
2021-10-04T20:28:39.057Z DEBUG modem << +CEREG: 2,"2D83","01D11B0A",7,0,17,"11100000","11100000"
2021-10-04T20:28:47.358Z DEBUG modem << +CGEV: RESTR 2,2
2021-10-04T20:28:47.384Z DEBUG modem >> AT+CGDCONT?
2021-10-04T20:28:47.404Z DEBUG modem << +CGDCONT: 0,"IP","","",0,0
2021-10-04T20:28:47.406Z DEBUG modem << OK
2021-10-04T20:28:47.411Z DEBUG modem >> AT+CGACT?
2021-10-04T20:28:47.431Z DEBUG modem << +CGACT: 0,0
2021-10-04T20:28:47.432Z DEBUG modem << OK
2021-10-04T20:28:56.985Z DEBUG modem << %CESQ: 41,2,5,0

AT_CLIENT gets an IP address but SLM gets nothing. We need SLM working though since we need to be able to do the AT%xMQTT instructions which for whatever reason just get rejected in AT_CLIENT. I did have this working ONCE on SLM but only the first few times. Code is right out of the box no mods