no signal

RE: no signal

a3p — Fri, 30 Aug 2019 16:15:59 GMT

is there a way to make LTE-M work Martin Lesund

RE: no signal

a3p — Mon, 12 Aug 2019 15:58:52 GMT

also how do i set this using the LTE Link Control driver?

RE: no signal

a3p — Mon, 12 Aug 2019 13:05:29 GMT

thanks Martin!

the output is different now for NB-IoT

+CESQ: 99,99,255,255,255,36

is there a similar thing that would make LTE-M work?

RE: no signal

Martin Lesund — Mon, 12 Aug 2019 11:42:14 GMT

Hi a3p,

I forgot that some networks do not support ePCO, which is most likely the case here.

Please try to the AT command:

AT%XEPCO=0

then switch to nb-iot mode,

AT%XSYSTEMMODE=0,1,0,0

before you turn on the modem (at+cfun=1).

RE: no signal

a3p — Fri, 09 Aug 2019 13:58:20 GMT

yes, the basis sim is now registered. no change. is the usage of the nrf cloud mandatory?

this is germany/Berlin with good coverage of both LTE and NB-IoT. My telekom sim works fine with a simcom modem, which also gives considerably more debug out if something is wrong.

with the hex file you send me, no traces are collected using the trace collector from nrfconnect, even when setting

AT%XMODEMTRACE=1,2

I already attached a trace file earlier. do you need a different one?

when running for a long time, i ocassionally get "

%CESQ: 255,0

+CEREG: 2,"FFFE","FFFFFFFF",7


currently i'm assuming that the DK is simply broken, and i ordered a second one.

RE: no signal

Martin Lesund — Fri, 09 Aug 2019 13:25:54 GMT

Hi A3p,

In which country are you located?
Did you register the ibasis SIM on nrf cloud?

Could you try to set the command:

AT%XMODEMTRACE=1,2

before you turn on the modem.

Please provide logs and any additional information you could think is important for me to know.

RE: no signal

a3p — Fri, 09 Aug 2019 12:59:14 GMT

thanks, thats good to know. i did now test it by waiting 20 minutes with each sim card.

same result

RE: no signal

Martin Lesund — Fri, 09 Aug 2019 11:36:50 GMT

Hi a3p,
How long do you typically wait for a connection?

The first time you do this, it can take up to 3-5 minutes. (and the response from CESQ will show 255 until you get a response from the eNB)

e.g.

***** Booting Zephyr OS v1.14.99-ncs2 *****
The AT host sample started
AT+CFUN?
+CFUN: 4
OK
AT+CFUN=1
OK
AT+CFUN?
+CFUN: 1
OK
AT+CGSN=1
+CGSN: "352656100037632"
OK
AT+CGMI
Nordic Semiconductor ASA
OK
AT+CGMM
nRF9160-SICA
OK
AT+CGMR
mfw_nrf9160_1.0.0
OK
AT+CEMODE?
+CEMODE: 2
OK
AT%XCBAND=?
%XCBAND: (1,2,3,4,5,8,12,13,14,17,18,19,20,25,26,28,66)
OK
AT+CMEE?
+CMEE: 0
OK
AT+CMEE=1
OK
AT+CNEC?
+CNEC: 0
OK
AT+CNEC=24
OK
AT+CGEREP?
+CGEREP: 0,0
OK
AT+CGDCONT?
OK
AT+CGACT?
OK
AT+CGEREP=1
OK
AT+CIND=1,1,1
OK
AT+CEREG=2
OK
AT+CEREG?
+CEREG: 2,4,"FFFE","FFFFFFFF",7
OK
AT%CESQ=1
OK
AT+CESQ
+CESQ: 99,99,255,255,255,255
OK
AT%XSIM=1
OK
AT%XSIM?
%XSIM: 1
OK
AT+CPIN?
+CPIN: READY
OK
AT+CPINR="SIM PIN"
+CPINR: "SIM PIN",3
OK
AT+CIMI
204080813512754
OK
at+cesq
+CESQ: 99,99,255,255,255,255
OK
at+cesq
+CESQ: 99,99,255,255,255,255
OK
at+cesq
+CESQ: 99,99,255,255,255,255
OK
at+cesq
+CESQ: 99,99,255,255,255,255
OK
at+cesq
+CESQ: 99,99,255,255,255,255
OK
at+cesq
+CESQ: 99,99,255,255,255,255
OK
at+cesq
+CESQ: 99,99,255,255,255,255
OK
at+cesq
+CESQ: 99,99,255,255,255,255
OK
at+cesq
+CESQ: 99,99,255,255,255,255
OK
at+cesq
+CESQ: 99,99,255,255,255,255
OK
at+cesq
+CESQ: 99,99,255,255,255,255
OK
at+cesq
+CESQ: 99,99,255,255,255,255
OK
%CESQ: 51,2
+CEREG: 2,"76C1","0102DA04",7
%CESQ: 56,2
+CGEV: ME PDN ACT 0,0
AT+CGDCONT?
+CNEC_ESM: 50,0
+CEREG: 5,"76C1","0102DA04",7
+CIND: "service",1
+CIND: "roam",1
+CGDCONT: 0,"IP","ibasis.iot","10.160.28.172",0,0
OK
AT+CGACT?
+CGACT: 0,1
OK
at+cesq
+CESQ: 99,99,255,255,255,56
OK

after a successful connection you can store the network data to modem flash by turning OFF the modem completely: AT+CFUN=0

Then if you reboot the kit and turn on the modem you should see that you get a connection much quicker.

RE: no signal

a3p — Fri, 09 Aug 2019 07:18:04 GMT

no, i tried v1.0.0 as well as master

same issue with the hex you provided.

same with external or internal antenna.

same issue with the included iBasis Sim as well as a known working Telekom sim

devzone.nordicsemi.com/.../nrfconnect.log

RE: no signal

Martin Lesund — Thu, 08 Aug 2019 13:44:45 GMT

Hi a3p,

It does look like you are using an older version than NCS v1.0.0?

Please try to use this precompiled at_client: devzone.nordicsemi.com/.../merged.hex

You can flash it using the programmer app in nrf connect for desktop or by the command line: nrfjprog --program merged.hex -f nrf91 -r --sectorerase --verify

Since you are mentioning "same antenna" are you using an external antenna on the nRF91 DK? Please keep this in mind

Please send a new Log using LTE Link Monitor and just let the application run through the script by sending the AT command: AT+CFUN?

Are you using the iBasis SIM card provided with the kit?

Best regards,

Martin L.

RE: no signal

a3p — Wed, 07 Aug 2019 19:33:55 GMT

yes.

AT+COPS? is the current network, which is of course empty for me

AT+COPS?

+COPS: 0

hence AT+COPS=? to search for networks

RE: no signal

a3p — Wed, 07 Aug 2019 19:20:04 GMT

thats with CAT-M1 which i know works with the same sim, same antenna, different modem.

i also tried NB-IOT with the same result.devzone.nordicsemi.com/.../nerfconnect.log

attached is the complete nrf connect session

RE: no signal

MJD093 — Wed, 07 Aug 2019 13:15:13 GMT

Are you sure you have entered that command correctly?

According to the latest AT Manual, the command for reading the current selection mode and network is AT+COPS?, not =?

RE: no signal

Martin Lesund — Wed, 07 Aug 2019 12:57:25 GMT

Hi a3p,

Which network are you trying to connect to? LTE-M or NB-IoT?

You can switch this by the AT command: xsystemmode

Please share the full output from LTE link monitor.

Best Regards,

Martin L.

RE: no signal

a3p — Tue, 06 Aug 2019 08:24:01 GMT

devzone.nordicsemi.com/.../trace_2D00_2019_2D00_08_2D00_06T08_2D00_07_2D00_29.756Z.bin

welp. now i understand how to upload files, sorry. here it is.