Sending SMS using at_client example

Question

Should it be possible to send SMS with the at_client example, and is there any special requirements to do so? This is the AT commands setup procedure I've used: AT+CFUN=1 OK AT+CPIN="1234" OK AT+CNUM +CNUM: ,"+47123456789",145 OK AT+CEREG? +CEREG: 0,5,"0AF1","02055515",7 OK AT+CNMI=3,2,0,1 OK After this I can receieve SMS. But if I try to send one, the following happens: AT+CMGS=170691746435990511000A91742904694700000B04F4F29C0E_{ERROR
It looks like I get the ERROR as soon as the carriage return is sent
AT+CMGS=17 ERROR}

skyfex · Accepted Answer

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=27XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX_{+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)}

Sending SMS using at_client example

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