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    LTE-M Connection Problem with BG96

    The Thing For IoT Creators
    lte-m cat m1 at commands
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    • K
      Kurosh last edited by

      Hi,
      I’m trying to connect to the LTE CAT M1 with BG96 , here is the set of AT commands that I used (see below) and the log responses. I expected at the end maybe couple of times 2, as the response to the command “at+cereg?” then it should connect and gives 5 back. But I recieve 2 couple of times then it even dosen’t search anymore and gives 0 back!

      Dose anyone have an idea what could be causing this?

      Regards,
      Kurosh

      08:57:19.196 -> at+cfun=1

08:57:20.489 -> OK
08:57:20.489 -> at+cpin?

08:57:20.489 -> +CPIN: READY
08:57:20.489 -> 
08:57:20.489 -> OK
08:57:20.806 -> at+cfun=0

08:57:20.848 -> OK
08:57:22.095 -> ATI

08:57:22.095 -> Quectel
08:57:22.095 -> BG96
08:57:22.095 -> Revision: BG96MAR02A07M1G
08:57:22.095 -> 
08:57:22.095 -> OK
08:57:23.416 -> at+gsn

08:57:23.416 -> 860536040710222
08:57:23.416 -> 
08:57:23.416 -> OK
08:57:24.707 -> at+qcfg="nwscanseq",020202,1

08:57:24.707 -> OK
08:57:25.988 -> at+qcfg="nwscanmode", 3,1

08:57:25.988 -> OK
08:57:27.320 -> at+qcfg="iotopmode",0,1

08:57:27.320 -> OK
08:57:28.599 -> at+qcfg="band",0,80000,0

08:57:28.599 -> OK
08:57:29.894 -> at+qcfg="roamservice",255,1

08:57:29.894 -> OK
08:57:31.216 -> at+qcfg="servicedomain",1,1

08:57:31.216 -> OK
08:57:32.505 -> at+cgdcont=1,"IP","internet.nbiot.telekom.de"

08:57:32.505 -> OK
08:57:33.783 -> at+cfun=1

08:57:35.090 -> OK
08:57:35.090 -> at+cops=?

08:57:36.603 -> +COPS: (1,"Vodafone.de","Vodafone","26202",8),(1,"Vodafone.de","Vodafone","26202",8),(1,"Vodafone.de","Vodafone","26202",8),(1,"Telekom.de","TDG","26201",8),(1,"Telekom.de","TDG","26201",8),(1,"Telekom.de","TDG","26201",8),,(0,1,2,3,4),(0,1,2)
08:57:36.637 -> 
08:57:36.637 -> OK
08:57:41.198 -> at+cops=1,2,"26201",8

08:57:44.283 -> OK
08:57:47.371 -> at+cind?

08:57:47.405 -> +CIND: 0,4,0,0,1,0,0,0
08:57:47.405 -> 
08:57:47.405 -> OK
08:57:50.698 -> at+cereg?

08:57:50.698 -> +CEREG: 0,2
08:57:50.698 -> 
08:57:50.698 -> OK
08:57:53.981 -> at+cereg?

08:57:53.981 -> +CEREG: 0,2
08:57:53.981 -> 
08:57:53.981 -> OK
08:57:57.281 -> at+cereg?

08:57:57.281 -> +CEREG: 0,2
08:57:57.281 -> 
08:57:57.281 -> OK
08:58:00.579 -> at+cereg?

08:58:00.579 -> +CEREG: 0,0
08:58:00.579 -> 
08:58:00.579 -> OK
08:58:03.871 -> at+cereg?

08:58:03.871 -> +CEREG: 0,0
08:58:03.871 -> 
08:58:03.871 -> OK
08:58:07.188 -> at+cereg?

08:58:07.188 -> +CEREG: 0,0
08:58:07.188 -> 
08:58:07.188 -> OK
08:58:10.489 -> at+cereg?

08:58:10.489 -> +CEREG: 0,0
08:58:10.489 -> 
08:58:10.489 -> OK
      1 Reply Last reply Reply Quote 0
      • Uta
        Uta Deutsche Telekom IoT last edited by

        Hi Kurosh,
        08:57:32.505 -> at+cgdcont=1,“IP”,“internet.nbiot.telekom.de”
        this APN is for NB-IoT only.
        For LTE-M you can use the APN internet.m2mportal.de.

        I suspect that between 08:57:57.281 and 08:58:00.579 you get a +CEREG: 0,3 (rejected from network)?
        Regards, Uta

        K 1 Reply Last reply Reply Quote 1
        • K
          Kurosh last edited by

          @Uta said in LTE-M Connection Problem with BG96:

          APN internet.m2mportal.de

          Thank you so much for the answer. It worked after I changed the APN.

          1 Reply Last reply Reply Quote 1
          • K
            Kurosh @Uta last edited by

            @Uta
            Hi Uta,

            I wanted also to test the NB connection which did’t work for me and I switched back to the configuration for LTE-M. Now It dosen’t even connect anymore with the lTE-M config. I recieve CME ERROR 13 which is really strange! I wonder what I’m missing here!

            Kind regards,
            Kurosh

            08:07:46.615 -> at+cpin?

08:07:46.615 -> +CPIN: READY
08:07:46.667 -> 
08:07:46.667 -> OK
08:07:46.948 -> at+cfun=0

08:07:47.000 -> OK
08:07:48.248 -> ATI

08:07:48.248 -> Quectel
08:07:48.248 -> BG96
08:07:48.248 -> Revision: BG96MAR02A07M1G
08:07:48.248 -> 
08:07:48.248 -> OK
08:07:49.532 -> at+gsn

08:07:49.532 -> 860536040826531
08:07:49.532 -> 
08:07:49.532 -> OK
08:07:50.834 -> at+qcfg="nwscanseq",020202,1

08:07:50.834 -> OK
08:07:52.166 -> at+qcfg="nwscanmode", 3,1

08:07:52.166 -> OK
08:07:53.417 -> at+qcfg="iotopmode",0,1

08:07:53.417 -> OK
08:07:54.757 -> at+qcfg="band",0,80000,0

08:07:54.757 -> OK
08:07:56.030 -> at+qcfg="roamservice",255,1

08:07:56.030 -> OK
08:07:57.346 -> at+qcfg="servicedomain",1,1

08:07:57.346 -> OK
08:07:58.659 -> at+cgdcont=1,"IP","internet.m2mportal.de"

08:07:58.659 -> OK
08:07:59.948 -> at+cfun=1

08:08:01.248 -> OK
08:08:01.248 -> at+cops=?

08:08:02.831 -> +COPS: (1,"Telekom.de","TDG","26201",8),(1,"Telekom.de","TDG","26201",8),(1,"Vodafone.de","Vodafone","26202",8),(1,"Vodafone.de","Vodafone","26202",8),(1,"Vodafone.de","Vodafone","26202",8),(1,"Telekom.de","TDG","26201",8),,(0,1,2,3,4),(0,1,2)
08:08:02.878 -> OK
08:08:07.346 -> at+cops=1,2,"26201",8
08:08:44.551 -> at+cops=1,2,"26201",8
08:08:50.717 -> at+cops=1,2,"26201",8
08:08:56.936 -> +CME ERROR: 13
            1 Reply Last reply Reply Quote 0
            • Uta
              Uta Deutsche Telekom IoT last edited by

              Hi Kurosh, in Germany, Deutsche Telekom uses band 20 for LTE-M.
              See here

              K 1 Reply Last reply Reply Quote 0
              • K
                Kurosh @Uta last edited by

                @Uta thank you for your fast reply! I indeed used B20. According to the Quectel’s Manual 80000 should be set for the B20. ( at+qcfg=“band”,0,80000,0 --> Screenshot)

                Screen Shot 2021-03-22 at 9.20.05 AM.png

                1 Reply Last reply Reply Quote 0
                • Uta
                  Uta Deutsche Telekom IoT last edited by

                  @Kurosh said in LTE-M Connection Problem with BG96:

                  08:08:07.346 -> at+cops=1,2,“26201”,8

                  why does it show “8”?

                  K 1 Reply Last reply Reply Quote 0
                  • K
                    Kurosh @Uta last edited by

                    @Uta I guess it stands for LTE-M for example in AT+COPS= 1,2, “26201”, 8 —> here the 8 is used to set LTE-M.
                    So my guess is that it responses at+cops? with the same coding numbers as well!

                    Screen Shot 2021-03-22 at 9.56.24 AM.png

                    1 Reply Last reply Reply Quote 0
                    • Yassine Amraue
                      Yassine Amraue Deutsche Telekom IoT last edited by

                      Hi Kurosh,

                      In an earlier message when you changed the APN it was working fine. Is there anything you changed since than? In general your AT commands seem fine.

                      Can you please do the following:

                      Turn off the radio with AT+CFUN=0. Do a AT+CEREG=3 and AT+QCSCON=1 (or if that doesn’t work use AT+CSCON=1). This will automatically print URC messages giving us an indication about what the module is doing. You should see automatic +CEREG and +CSCON messages arriving on your screen when you try to attach. If that doesn’t happen, your URC Indication configuration is not correct. Try using the command AT+QURCCFG=“urcport”,[“usbat” or “usbmodem” or “uart1”]. This depends on which serial port you are using so just try out one after the other, reboot the module and see if you get the URCs (an indication that it’s configured correctly is that you get a +CPIN: READY automatically printed on the screen when the module boots up.)

                      After that please send the logs so we can try to figure out what is going wrong.

                      Best
                      Yassine

                      K 1 Reply Last reply Reply Quote 1
                      • K
                        Kurosh last edited by

                        @Yassine-Amraue
                        Hi Yassine,
                        Thank you for your reply. Here is what I recieved from the commands you suggested:

                        12:43:30.692 -> at+cfun=0

12:43:30.739 -> OK
12:43:32.005 -> at+cereg=3

12:43:32.005 -> ERROR
12:43:33.317 -> at+qcscon=1

12:43:33.317 -> OK
12:43:34.583 -> at+cscon=1

12:43:34.583 -> ERROR

                        I also tried similar commands (basically the same commands but with question mark instead):

                        12:56:38.725 -> at+cpin?

12:56:38.725 -> +CPIN: READY
12:56:38.725 -> 
12:56:38.725 -> OK
12:56:39.006 -> at+cfun=0

12:56:39.053 -> OK
12:56:40.319 -> at+cereg?

12:56:40.319 -> +CEREG: 0,0
12:56:40.319 -> 
12:56:40.319 -> OK
12:56:41.631 -> at+qcscon?

12:56:41.631 -> +QCSCON:0,0
12:56:41.631 -> 
12:56:41.631 -> OK
12:56:42.944 -> at+qurccfg=?

12:56:42.944 -> +QURCCFG: "urcport",("usbat","usbmodem","uart1")
                        1 Reply Last reply Reply Quote 0
                        • K
                          Kurosh @Yassine Amraue last edited by

                          @Yassine-Amraue
                          I just tried to connect with NB instead which didn’t work either! Is Something wrong in my configs?

                          at+cpin?

+CPIN: READY

OK
at+cfun=0

OK
ATI

Quectel
BG96
Revision: BG96MAR02A07M1G

OK
at+gsn

860536040812077

OK
at+qcfg="nwscanseq",030303,1

OK
at+qcfg="nwscanmode", 3,1

OK
at+qcfg="iotopmode",1,1

OK
at+qcfg="band",0,0,80

OK
at+qcfg="roamservice",255,1

OK
at+qcfg="servicedomain",1,1

OK
at+cgdcont=1,"IP","internet.nbiot.telekom.de"

OK
at+cfun=1

OK
at+cops=?

+CME ERROR: 3
at+cops=1,2,"26201",9

OK
at+cind?

+CIND: 0,0,0,0,0,0,0,0

OK
at+cereg?

+CEREG: 0,0
                          1 Reply Last reply Reply Quote 0
                          • Yassine Amraue
                            Yassine Amraue Deutsche Telekom IoT last edited by

                            @Kurosh

                            I don’t see the URCs arriving at your screen. As described in my last message, please configure your URC port.
                            If it is configured correctly you should see something like this:

                            ate0 
ate0

OK

at+cfun=0 

OK

at+qcscon=1 

OK

at+cereg=2 

OK

at+cfun=1 

OK

+CPIN: READY

+QUSIM: 1

+QIND: SMS DONE

at+cops=1,2,"26201",8 

OK

+QCSCON: 1,1

+CEREG: 5,"6F55","18CB40E",8

+QCSCON: 1,0

+CEREG: 5,"6F55","18CB404",8

                            Notice that the +QCSCON: 1,1 and +CEREG: 5,“6F55”,“18CB40E”,8 pop up automatically.
                            Also right after turning on the radio with AT+CFUN=1 you can see

                            +CPIN: READY

+QUSIM: 1

+QIND: SMS DONE

                            popping up automatically. I dont see that in your logs. Please configure your URC port and issue the commands as I’ve shown in the example here.

                            Best
                            Yassine

                            1 Reply Last reply Reply Quote 0
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