Can't initiate ping in nRF9160 to one APN.

[olegtk1]

Hi.

In our private network we experience one problem.

We can ping Google (8.8.8.8) via APN customer4. In Wireshark traces it is seen that ping is initiated.

On RRC level Control plane service request is initiated, and ping is run successfully.

When we change APN to internet, we can see that ping is not initiated, UE turns into RRC-IDLE state after expiration of inactivity timer.

And we can see error-22 at terminal session.

Can somebody prompt what can be a reason for such fails?

Thanks,

Oleg

trace of At commands failed pings.pcapng

trace-customer4APN__AT_commands successful ping.pcapng

[Michal]

Hello Oleg,

What are your NCS and Modem FW versions?

Also, do you have the original .bin/.mtrace modem traces as well?

Best regards,

Michal

[olegtk1]

Hi Michal.

Thanks for Your response.

This is Modem FW version:

I am not sure if it is NCS:

I will ask Customer for original .bin/.mtrace .

We are planning another log collection session with Customer.

Would You suggest please if anything else is needed except Trace Collector logs?

BR

Oleg

[olegtk1]

Hi Michal.

Can You share instructions how to do that?

BR

Oleg Tkachenko

[Michal]

Hi Oleg,

They just have to add CONFIG_NRF_MODEM_LIB_TRACE=y to their prj.conf file.

Also, if they flash the Modem Shell sample from Cellular Monitor then it should have traces enabled by default as well.

Here is a blogpost about Cellular Monitor if needed:  Introducing the Cellular Monitor

Best regards,

Michal

[olegtk1]

Hi Michal.

Thank You ! I will pass this ino to Customer.

Would You please guide me on another issue. 

I met in Internet results of PING testing nRF9160 DK in India.

Here is the link: Testing NB-IoT connectivity in India with NRF9160 and Airtel - Electronic Projects Design/Ideas - Electronics-Lab.com Community

They run ping directly via AT commands. In nRF9169 DK AT COMMANDS pdf I was not able to find AT PING command.

But, according to below screenshot Indian colleagues pinged Google with AT command successfully:

 Due to the low resolution of the image, I can't make out the command.

Was it  ">AT%PING="www.google.com",45,5000,5,1000"?

Should ">AT%PING=xxx " work? In case if I do not want to make it via Modem Shell?

BR

Oleg Tkachenko

[Michal]

Hello Oleg

That is the AT#XPING command from SLM.

Best regards,

Michal

[olegtk1]

Hi Michal.

I received modem that we sent to client and tried to upgrade firmware to 1.3.5 version.

I upgraded it, installed application SW, but when I tried to connect to modem via Tera Term VT terminal, I failed. The only response I was able to receive was this (when I physically switched off/on modem):

If anything can be done in this case or modem is faulty?

Best regards,

Oleg Tkachenko

[Michal]

Hi Oleg,

What happens when you re-flash the application and the modem with a precompiled MoSH from Cellular Monitor?

Best regards,

Michal

[olegtk1]

Hi Michal.

I did not use Cellular Monitor. I was making re-flashing with Programmer.

Do You have instruction on how to make it via Cellular Monitor?

Br,

Oleg

[Michal]

Hi Oleg,

We have an Introduction to Cellular Monitor blogpost. Inside there is a part on preparing the devices.

Just thought that it is a good way to check your compiled MoSH binary may have been malformed in some way.

Best regards,

Michal

[olegtk1]

Hi Michal.

I tried to re-flash our modem via Cellular Monitor and results (of installation only) were successful.

I installed first Asset Tracker v2:

Then I installed Modem Shell:

I was able to connect to modem with Tera Term, but modem did not function:

 

Then I made switch off/on manually. After that result was the same.

Then I installed Serial LTE modem:

After that I lost connectivity to modem:

I did not react anymore on resets or switch OFF/ONs.

Any suggestions?

BR

Oleg Tkachenko

[Michal]

I feel like there may be something wrong with this device. Do you have any other DK to test?

Best regards,

Michal