Although the PDP context was deleted, the nRF9160 modem fails to recognize this, preventing it from sending data to the server.

[LuckyMan]

Hi Nordic,

I am using modem nRF9160 to send a couple of bytes to my server. However, I have a problem with the PDP context. More particularly, when the PDP context is deleted, and a new PDP is activated, but the modem cannot recognize this. So, my IoT node seems to be down and cannot send data to the server.

I wonder if there is any solution to deal with this issue.

 I am using the Emnify SIM card, and the nodes are deployed in Vietnam.

Best regards,

Văn Vũ

[Øyvind]

Hello, 

Are you able to provide logs and modem traces from the device, please? What modem FW are you running on your device? We will need to have a look at the modem itself to understand if the network stops the pdp connection. 

Thank you.

Kind regards,
Øyvind

[LuckyMan]

HI Øyvind,

Thank you for your quick response.

My nodes are deployed in the field, and occasionally, they fail to send data to the server. Upon investigating the EMNIFY SIM console, I noticed that the previous PDP context was deleted (See the picture I sent earlier).

I checked the power supply of the nodes, and everything seemed fine. However, after resetting the modem, the connection resumed. This issue occurs randomly - about once a few month - making it difficult to capture logs at the time of failure.

- I am using the firmware version nrf9160dk_mfw-1.3.6.

Best,

Van Vu

[Øyvind]

I'm afraid there is not much we can do from our side without logs. Based on a similar case where the PDP context was reported deleted in the SIM console it turned out to be an issue with the network. So in this case please contact both Emnify and Viettel for more information. 

Kind regards,
Øyvind

[LuckyMan]

Hi Øyvind,

Yeah, I will try to get the Log file. And, I will contact Emnify and Viettel to find the issue.

Thank you for your suggestion.

Best,

Van Vu