asset tracker v2 connot connect nrf-cloud

[jessie wang]

   hello,everyone!   I'm having a major problem with my nrf9160 dk board suddenly not connecting to the cloud.  I registered and renewed my certificate, but the result still failed to connect to the nrf-cloud. I don't know how to operate to solve it.  Please give me some help.  

   I would like to express my sincere thanks.

   yours

   jessie

   sdk:1.9.0               LTE:NB-IOT

   

  

[jessie wang]

Supplementary notes:

    1. It can be connected to the cloud before, but it can't be connected recently.

     2. The network can be connected using China Mobile

[Charlie]

Hi Jessie,

1) Did you check if there is still data left for the SIM card subscription?

2) Have you moved to one place that may have a poor signal?

To check the network connection state, I suggest you play with the SLM sample with LTE Link Monitor. Use AT commands to connect the NB-IoT network then ping one website, something like

AT+CFUN=4
AT+CFUN?
AT%XSYSTEMMODE=0,1,0,0
AT+CEREG=5
AT%CESQ=1
AT+CFUN=1
AT#XPING="www.google.com",45,5000,5,1000

Remember to enable the Automatic requests setting and share the LTE Link Monitor log file if you have some findings.

Best regards,

Charlie

[jessie wang]

1. The sim card can be connected to the Internet and has traffic

2. 

%CESQ: 84,4,34,4
%CESQ: 77,3,34,4
%CESQ: 255,0,255,0AT#XPING="www.baidu.com",45,5000,5,1000
OK
%CESQ: 76,3,20,2
%CESQ: 77,3,34,4
%CESQ: 77,3,29,4
#XPING: 0.348 seconds
[00:08:13.098,937] [0m<inf> slm_icmp: Ping target's IPv4 address
[0m#XPING: 0.451 seconds
#XPING: 1.088 seconds
#XPING: 0.739 seconds#XPING: 0.266 seconds
#XPING: average 0.578 seconds[00:08:21.004,913] 
[0m<inf> slm_icmp: Packets: Sent = 5, Received = 5, Lost = 0 (0% loss)
[0m[00:08:21.005,187] [0m<inf> slm_icmp: Approximate round trip times in milli-seconds:    Minimum = 266ms, Maximum = 1088ms, Average = 578ms
[0m%CESQ: 77,3,24,3
%CESQ: 78,3,29,4

3.The nordic clouds were able to connect until recently

4.The download and update of the certificate and the certification certificate are carried out according to the steps of the official website, and also try several times to ensure that there is no problem.

Thanks very much！！！！

Yours jessie

[Charlie]

Hi Jessie,

OK, good to know the Internet connection has no problem.

For the next step of debugging, could you provide the following recordings?

1) device modem trace, which can be easily get by following Collecting a modem trace for the nRF9160 DK. We would be able to see the detail of data traffic to find the cause.

2) log with debug information, basically the printout you have shown, and it should be collected same time as modem trace recording.

Best regards,

Charlie

[jessie wang]

Hi, Charlie,

   I'm happy to tell you that the problem has been solved.  The reason is rather embarrassing. It seems that there is a problem with the sdk, maybe because I made some changes accidentally before. After I re-used the new sdk, I succeeded in connecting the cloud.I'm sorry to bother you.Thanks for taking the time to help me.

yours

jessie