EC20 - Modem Manager disconnection issues in our MNVR ( Not establishing the network connection between cloud server and the MNVR )

IoT Modules LTE Standard Module
, ,
1

We are using Quectel EC20 module in one our MNVR ( Mobile Network Video Recorder ) . Please find the attached sys log for one of our MNVR which is causing Network disconnection issues and thereby the kit went offline.

Actually this specific Kit ( CDJ1113 ) worked fine for 21 days and after 12th. Sep 2023.end of the day and 13 th Sep 2023 .early morning ( after 2:00 AM ) this MNVR kit is not connected to the cloud and it is not reconnecting again automatically. Only after restarting this kit manually on 15th Sep.@10:00PM , then this kits starts working fine until 19.09.2023. Could you please organize to review the attached sys logs and advise us to resolve the problem contributed in this MNVR device from the time period after 12th. Sep.end of the day and 13 th Sep.early morning ( after 2:00 AM ). this would be really help full for us to fix the problem.

      Best Regards, Ramesh

Sys Log details as follows : it seems to be ModemManager couldn’t get online since Sep-12 UTC0910, and it was recovered by Sep-13 UTC0144

Line 2566: Sep 12 09:07:26 SMNVR0820210982 ModemManager[4545]: Modem /org/freedesktop/ModemManager1/Modem/0: state changed (registered → connecting)
Line 2569: Sep 12 09:07:26 SMNVR0820210982 ModemManager[4545]: Modem /org/freedesktop/ModemManager1/Modem/0: state changed (connecting → connected)
Line 2570: Sep 12 09:07:26 SMNVR0820210982 ModemManager[4545]: Simple connect state (8/8): All done
Line 2746: Sep 12 09:10:51 SMNVR0820210982 ModemManager[4545]: checking if connected failed: PDP context not found in the known contexts list
Line 2887: Sep 12 09:40:06 SMNVR0820210982 ModemManager[4545]: checking if connected failed: Couldn’t check current list of active PDP contexts: No carrier
Line 2893: Sep 12 09:42:56 SMNVR0820210982 ModemManager[4545]: checking if connected failed: PDP context not found in the known contexts list
Line 2928: Sep 12 10:08:24 SMNVR0820210982 ModemManager[4545]: checking if connected failed: Couldn’t check current list of active PDP contexts: Serial command timed out
Line 2929: Sep 12 10:08:26 SMNVR0820210982 ModemManager[4545]: checking if connected failed: PDP context not found in the known contexts list
Line 2938: Sep 12 10:14:06 SMNVR0820210982 ModemManager[4545]: checking if connected failed: PDP context not found in the known contexts list
Line 2940: Sep 12 10:15:34 SMNVR0820210982 ModemManager[4545]: checking if connected failed: Couldn’t check current list of active PDP contexts: Serial command timed out
Line 2950: Sep 12 10:17:11 SMNVR0820210982 ModemManager[4545]: checking if connected failed: PDP context not found in the known contexts list

Sep 13 01:44:38 SMNVR0820210982 ModemManager[4545]: Modem /org/freedesktop/ModemManager1/Modem/0: state changed (connected → disconnecting)
Sep 13 01:44:38 SMNVR0820210982 ModemManager[4545]: Simple connect started…
Sep 13 01:44:38 SMNVR0820210982 ModemManager[4545]: Simple connect state (4/8): Wait to get fully enabled
Sep 13 01:44:40 SMNVR0820210982 ModemManager[4545]: network forced PS detach: all contexts have been deactivated
Sep 13 01:44:40 SMNVR0820210982 ModemManager[4545]: Bearer /org/freedesktop/ModemManager1/Bearer/0: explicitly disconnected
Sep 13 01:44:40 SMNVR0820210982 ModemManager[4545]: Modem /org/freedesktop/ModemManager1/Modem/0: state changed (disconnecting → registered)

Such error you can find similar issue on Huawei E3372h-153: "PDP context not found" warning in loop when being in broadband mode and using connection profile id 0 (#567) · Issues · Mobile broadband connectivity / ModemManager · GitLab

2

Hi @NPD
Did you automatically reconnect after being disconnected this time, or did you reconnect after restarting? The specific cause cannot be seen from the log provided, and it is suspected to be a network failure of the operator.

3

Hi lyman -Q,
Thanks for your feedback,
Once this problem occurred in the MNVR, after that the system got hang up and there is any option for auto restart , we have to restart by manual mode by unplug the Power cable and re-plugged then this MNVR will starts working for few days . But after sometime the same error is occurring again repeatedly.

  • Apart from this we thought of upgrade with latest EC20 module Firmware to check either this type of error have been debugged with new features or improved features, but we have no any solid conclusion on this, I have attached the release note of latest Firmware EC20CEFRGR06A04M4G.
    Do you have any solution, please advise , because we are facing this type of issues in 1200 Nos of MNVR.
    Quectel_EC20-CE-FRG_R2.1_Firmware_Release_Notes_V0604.pdf (854.7 KB)
4

Hi @NPD
Thank you for your feedback, but the current information cannot confirm the problem. Is this problem easy to reproduce? I will send you the tool to capture logs. Can you capture a problematic log for analysis?

5

Hi lyman-Q,
Thanks for your inputs,
Please share me the tool to capture the logs and share with you.
Best Regards,
Ramesh

6

Hi @NPD
I send the tool to you by chat box,it works on windows.

7

Hi@lyman-Q,
Please let me know this tool will work on Linux OS.
Regards,
Ramesh

8

output_1
output_11920×1080 331 KB

output_2
output_21920×1080 331 KB

Hi lyman-Q,
Please find the attached output details and i am unable to attached the logs file as the file size is 137MB and also the file format is not supporting in this forum .
Could you please support me to resolve .
Best Regards,
Ramesh

9

https://drive.google.com/file/d/1hxVY7wF3QMzbjArPFFMDy3oFDCkx5Epj/view?usp=drive_link
@lyman-Q , Hi,
Please find the attached log file fir your further analysis ,
Request you to review and help us by providing solution to overcome this .
Best Regards,
Ramesh