Hello, sorry if i missed some info, i'm new posting in this forum. I'm developing an IoT devices with the nrf9160 and we are having problem to connect to a LTE-M1 or LTE-NB Iot network in Chile with the nrf9160. We are using a custom board. All with hardware is good, the nrf9160 is flashed with segger jlink and using the SDK v2.5.1 and the modem fw v1.3.6.
Anyone else with problems connecting the nrf9160 to any sudamerica network?
thanks
Hi Francisco,
Which application do you use?
Is this newly emerged issue or you have seen this happening before?
Could you provide application log showing the problem?
Best regards,
Dejan
Hi Dejan,
It's a wearable band with LTE connection.
It's the first time we see this issue, all because it's the first time we use a Nordic MCU too.
I don't know if it's this application log that you need, but using AT commands to start the modem we get this.
AT%XSIM=1: OK AT+CFUN=1: OK AT+CRSM=176,12258,0,0,10: +CRSM: 144,0,"98651000XXXXXXXXX" OK AT%XSIM?: %XSIM: 1 OK AT+CNUMFailed to read, err 65536 AT+CNUM: ERROR AT+CFUN=0: OK AT%XSIM?: %XSIM: 0 OK AT%XSYSTEMMODE=1,1,0,1: OK AT%XBANDLOCK=0: OK AT+COPS=0: OK AT+CGDCONT=0,"IP","m2m.entel.cl": OK AT+CGAUTH=0,1,"entelpcs","entelpcs": OK AT+CFUN=1: OK AT+CEREG=1: OK AT+COPN: OK AT+COPS?: +COPS: 0 OK AT+CSQ: +CSQ: 99,99 OK AT+CEREG?: +CEREG: 1,4 OK AT%COPSFailed to read, err 65536 AT%COPS: ERROR
Best Regards,
Francisco
Hi Francisco,
Your first error when using CNUM indicates that either MSISDN on the SIM is not available or SIM is not initialized. You can get more information in CNUM documentation. However, AT command documentation shows that you should use +CNUM, not %CNUM. The same applies for COPS command.
Best regards,
Dejan
We have trying with many SIM from differents operators, the SIMs works well on cellphones too. About the CNUM and COPS we have used them with % and + and either way, it still giving error. We are trying to talk with an network operator technical to know more about the true tech used in Chile for LTE
Hi Francisco,
Thank you for this update.
Please let me know if you have any further questions.
Best regards,
Dejan
Hi Francisco,
You'll want to verify with Entel that the SIM card you have supports either NB-IoT or Cat M1.
In most cases, the APN is automatically set by the nrf9160, using the information from the SIM. Have you tried connecting without using +CGDCONT and +CGAUTH?
What is the output of AT%COPS=?
Mariano
Hi Mariano,
Yes, well, they are supposed to work with those networks, but now I'm doubt about they really use NB-IoT and Cat M1 or just Cat 1 optimized for IoT (it's something we have seen here on devices that really work as expected, like SimCom chips)
Without using +CGDCONT and +CGAUTH we are getting this
nRF9160 Basic Networking Example (nrf9160dk_nrf9160) Modem FW Ver: mfw_nrf9160_1.3.6 IMEI: 350xxxxxxxxxx SIM ICCID: 89560xxxxxxxxxxxx Waiting for network... %XSIM: 1 OK AT%XSIM=1: OK AT+CFUN=0: OK AT+CFUN=1: OK AT+cnum?Failed to read, err 65536 AT+cnum?: ERROR AT+CRSM=176,12258,0,0,10: +CRSM: 144,0,"98651xxxxxxxxxxx" OK AT%COPS=?: %COPS: (1,"","","73003",7) OK
Hi Mariano,
Yes, well, they are supposed to work with those networks, but now I'm doubt about they really use NB-IoT and Cat M1 or just Cat 1 optimized for IoT (it's something we have seen here on devices that really work as expected, like SimCom chips)
Without using +CGDCONT and +CGAUTH we are getting this
nRF9160 Basic Networking Example (nrf9160dk_nrf9160) Modem FW Ver: mfw_nrf9160_1.3.6 IMEI: 350xxxxxxxxxx SIM ICCID: 89560xxxxxxxxxxxx Waiting for network... %XSIM: 1 OK AT%XSIM=1: OK AT+CFUN=0: OK AT+CFUN=1: OK AT+cnum?Failed to read, err 65536 AT+cnum?: ERROR AT+CRSM=176,12258,0,0,10: +CRSM: 144,0,"98651xxxxxxxxxxx" OK AT%COPS=?: %COPS: (1,"","","73003",7) OK
Additionally we have this
AT+CRSM=176,12258,0,0,10: +CRSM: 144,0,"98651000002175646851" OK AT%COPS=?: %COPS: (1,"","","73001",9),(1,"","","73003",9) OK
and this
AT+CEREG?: +CEREG: 0,2,"6210","008C3526",9
Does it means that the nrf9160 is getting antenna's info and just need to change some network configuration?
Best regards
Francisco
Ok, so we can look at the different outputs:
AT%COPS=?:%COPS: (1,"","","73003",7)
Looking at the documentation for the %COPS=? command, we see that network is Cat M1 (AcT of 7), the MCC is 730 (Chile) and the MNC is 03 (Claro).
On the second post:
AT%COPS=?:
%COPS: (1,"","","73001",9),(1,"","","73003",9)
The AcT of 9 means these are NB-IoT networks. Same MCC of 730 (Chile), and MNC of 01 (Entel) and 03 (Claro).
Here is a good website to find MCC and MNC: https://mcc-mnc.com/
Then you get:
AT+CEREG?:
+CEREG: 0,2,"6210","008C3526",9
Here is the CEREG documentation. A <stat> of 2 means it's attempting to attach to that network.
What do you get if you check AT+CEREG? later? The 2 should change to something else when it's either successful or unsuccessful connecting to the network.
You might also consider sending AT+CEREG=5 before AT+CFUN=1 so that you get unsolicited notifications of network registration status changes.
Now i'm getting this
nRF9160 Basic Networking Example (nrf9160dk_nrf9160) Modem FW Ver: mfw_nrf9160_1.3.6 IMEI: 35045791793160 SIM ICCID: 8956010000161524685 Waiting for network... %XSIM: 1 OK AT%XSIM=1: OK AT+CSCON=1: OK AT+CFUN=0: OK AT+CEREG=5: OK AT%XSYSTEMMODE=0,1,0,0: OK AT+CFUN=1: OK AT%COPS=?: %COPS: (1,"","","73001",9),(1,"","","73003",9) OK
After a while, i get this
AT%COPS=?: %COPS: (1,"","","73001",9),(1,"","","73003",9) OK AT+CSQ: +CSQ: 99,99 OK AT+CEREG?: +CEREG: 5,2 OK
+CEREG: 5,2 still means attempting to attach to the network. I would make sure that the SIM card can work on NB-IoT.
You might want to look at a Modem Trace to get more information on what is going on with the network side. See Lesson 7 of the DevAcademy:
Mariano
