Send a SMS without PDN configured

[GoncaloS]

Hi, 

I have a question about the SMS sample (https://docs.nordicsemi.com/bundle/ncs-2.6.1/page/nrf/samples/cellular/sms/README.html). I can use this sample to send and receive SMS, but when I configured the PDN with the different APN, the sample cannot send or receive SMS. Is it possible to send SMS without PDN configured? 

I think the function used in this sample to connect to LTE network (lte_lc_connect()), connects to LTE network with PDN already configured. If so, is it possible to send SMS without PDN configured?

Regards, 

GoncaloS

[Øyvind]

Hello, 

Are you able to share some more details on this issue? Do you get an error when trying to send with PDN? Are the PDN settings needed by the network/SIM? 

What modem FW are you running on you device? I assume that you are running nRF Connect SDK v2.6.1?

Kind regards,
Øyvind

[GoncaloS]

Hi,

In theory, you don't need an active data connection to send SMS, you just need the device to be connected to an LTE network. In the SMS example provided by Nordic, the device connects to an LTE network using the lte_lc_connect() function and then the modem is able to send and receive messages if the apn is previously configured. If you change to a different apn than the one supported (using the pdn_ctx_configure function), the example of sending messages no longer works. So it seems that the example using the lte_lc_connect function connects to an LTE network with an active data connection, whereas for SMS you don't need an active data connection, you just need to be connected to an LTE network. Another question is, when we use the lte_lc_connect function, does the device connect to an LTE network with an active data connection or not?

I am using Modem FW 2.0.1 and the nRF Connect SDK v2.6.1.

Regards,

GoncaloS

[Øyvind]

GoncaloS said:

If you change to a different apn than the one supported (using the pdn_ctx_configure function), the example of sending messages no longer works.

Do  you activate the PDN afterwards with pdn_activate()?

Are you able to share your project?

[GoncaloS]

I use this code for testing and only use the pdn_ctx_configure function to configure and activate pdn.

sms_sample.zip

Regards,

GoncaloS

[Øyvind]

Hello, sorry for the late follow-up. Could you please retrieve application logs and modem traces from the device with the working SMS sample and the failing one, 

Thank you!

Kind regards,
Øyvind