Sending SMS using at_client example

RE: Sending SMS using at_client example

Jagruti — Thu, 24 Oct 2019 08:20:33 GMT

Hello,

I am trying to follow the same things recommended by skyfex but I am not able to send sms from iBASIS sim or my sim card as well. using AT+CMGS command always shows error or it is timed out. Can you please help me with this? I tried both programs (at_client and simple_at). But nothing works.

RE: Sending SMS using at_client example

Jagruti — Wed, 23 Oct 2019 13:58:32 GMT

Hello,

I am using simple_at program to send sms. But it is not working. Commands like AT+CFUN?, AT+CFUN=1, AT+CEREG? are working, but when i use AT+CMGS command, folllowing output comes. I am not able to send sms. I am using iBasis SIM card that came with the DK. when i give AT+CPIN="1234" it shows error.

Please help me with this.

RE: Sending SMS using at_client example

f0corner — Fri, 21 Jun 2019 11:38:14 GMT

Hello skyfex,

I tried what you are recommending here and it worked!

Thank you for sharing. That is some very useful information.

A+

Frank

RE: Sending SMS using at_client example

skyfex — Thu, 28 Feb 2019 17:24:26 GMT

One more thing, you may have to check if your network supports LTE-M

RE: Sending SMS using at_client example

skyfex — Thu, 28 Feb 2019 17:23:12 GMT

Etienne,
Does you SIM card have a PIN-code? My impression is that in the default configuration the OS will not boot if it's configured to work with a PIN-less SIM card, but the inserted card has a PIN-code.

It's possible to configure it to not attempt to connect to the network before booting, and in that case a SIM card with PIN-code is OK. You just have to send the right AT commands to enter the PIN-code as my example illustrated. I haven't tried to get networking up and running with PIN-code.

The configuration is in prj.conf
I don't remember which one. Maybe someone could find the documentation of this configuration file and link to it here.

I think you can disable the PIN-code on your SIM card from any phone as well.

— Audun

RE: Sending SMS using at_client example

Étienne Castanié — Thu, 28 Feb 2019 10:12:47 GMT

Hi Dominik! Thank you for your answer!

The behavior we saw is the following one:

- Booting simple_at with the iBasis sim card inserted in the DK works fine (= we see the secure boot trace + the application printk as expected)

- Booting simple_at (or else) with our own sim cards inserted (we tried two different ones, Orange & SFR french operators) only shows the secure boot traces, and nothing else after the "Booting Zephyr OS" printk. The firmware seems then stuck.

It seems like our sim cards are not "allowed" to be used with the nrf9160 DK.

Best,

Étienne

RE: Sending SMS using at_client example

Dominik Windhab — Wed, 27 Feb 2019 13:57:20 GMT

Hi! Has probably nothing to do with the SMS problem, but could you explain what "using SIM cards other than iBasis seems to prevent the firmware from booting" mean? I am also using my own sim card (with NB-IoT firmware), and the boot process itself is working. My problem is that the registration process is not working reliably. Meaning that it seems to work after I flashed the application for time and then never again.

RE: Sending SMS using at_client example

Étienne Castanié — Tue, 26 Feb 2019 09:55:57 GMT

Hi all!

We are trying to send SMS with the nrf9160 DK, without success.

Thank you @skyfex for your clear explanations. Unfortunately, using SIM cards other than iBasis seems to prevent the firmware from booting (we got the same behavior that @Diego Garcia with only the "Booting Zephyr OS" printk showing when using SIM cards other than the iBasis one).

@skyfex could you share which SIM card you used for your successful SMS test?

@Diego Garcia could you in the end manage to send SMS? If yes, could you share how you did it?

Thank you very much for your help!

Best,

Étienne

RE: Sending SMS using at_client example

Diego García — Tue, 05 Feb 2019 06:09:26 GMT

Hi!,

I'm following your steps, but it seems simple_at doesn't boot correctly. First I erase all, then program secure_boot, then simple_at. But it stops when showing "***** Booting Zephyr OS v1.13.99-ncs2 *****", and it doesn't show the first printk from app_socket_start.

Any help?

Thanks!

RE: Sending SMS using at_client example

skyfex — Mon, 07 Jan 2019 14:12:50 GMT

I was able to get sending of SMS to work.

It does not appear to work with the iBasis SIM card that came with the DK. But I was able to use my own SIM card (this might not work for everyone since LTE-M might not be supported)

I could not use the at_client example, as the AT+CMGS command isn't supported over a UART terminal to at_client, if I understand correctly.

If I write the AT commands directly from C firmware, it works.

This is the sequence of AT commands I used:

> AT+CPIN="1234"
OK
> AT+CFUN?
+CFUN: 4
OK
> AT+CFUN=1
OK
> AT+CFUN?
+CFUN: 1
OK
Sleeping...
> AT+CNUM
+CNUM: ,"+47123456789",145
OK
> AT+CEREG?
+CEREG: 0,2,"0AF1","02055515",7
OK
> AT+CNMI=3,2,0,1
OK
> AT+CMGS=27<CR>XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX<SUB>
+CMGS: 99
OK

It was important to add a sleep function before sending CPIN, and after sending CFUN=1

I used the following example for how to send simple AT commands from C firmware code:

https://github.com/Rallare/fw-nrfconnect-nrf2/blob/nrf9160_samples/samples/nrf9160/simple_at/src/main.c

(I used k_sleep(10000) to sleep before CPIN and after CFUN=1)

I used this tool to generate the AT+CMGS command:
http://rednaxela.net/pdu.php

In the C code the string for the CMGS command looks like this:

"AT+CMGS=YY\rXXXX\x1A"

Where YY is the length (from the first line from the PDU generator) and XXXX is the hexidecimal code (from the second line from the generator)