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.

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

[olegtk1]

Hi Michal.

I have another modem nRF9160 DK which was configured via Programmer and modem works with Tera Term terminal. Only LTE Link Monitor is not functioning. Firmware 1.3.5.

May be something else is needed to make it run?

BR

Oleg Tkachenko

[Michal]

Just to make sure, do you disconnect from Tera Term when using LTE Link Monitor? What about Serial Terminal app? Does it work?

Best regards,

Michal

[olegtk1]

Hi.

Yes. I disconnect from Tera Term when using LTE Link Monitor.

In Serial Terminal I can see only this:

BR

Oleg Tkachenko

[Michal]

Could you send me you .hex file, so I could test it on my setup?

Best regards,

Michal