Error 4 when sending UDP messages with Vodafone

[Ewoud_Smeur]

I have a couple of SARA AFF modules, which I want to use with Vodafone SIM cards in the Netherlands. I am able to work through the example AT commands presented here for Vodafone: http://support.sodaq.com/sodaq-one/at/, except for the last one (AT+NSOSTF=...), for which I get an error. With AT+CMEE=1, I can see that it is Error 4, which according to the AT commands manual is "Operation not supported".

If I exchange the Vodafone SIM card for a T-mobile card, I am able to send a UDP datagram, and I have verified data arriving at my server. In one occasion, when taking both a new AFF board and a new Vodafone SIM card, I was able to send data. However, a few days later also this combination didn't work any more.

Any ideas what may be wrong?

[Jan]

@Ewoud_Smeur,

Can you check if you have the firmware version mentioned on this page or newer?
https://support.sodaq.com/sodaq-one/firmware-upgrade/

What does the module say about these AT commands?:
If you have an N2 module:
AT+NSOST=0,"YOUR_SERVER_IP",YOUR_SERVER_PORT,12,"48656c6c6f20576f726c6421"
If you have an R4 module
AT+USOST=0,"YOUR_SERVER_IP",YOUR_SERVER_PORT,12,"48656c6c6f20576f726c6421"

Kind regards,
Jan

[Ewoud_Smeur]

@Jan,

Thanks for your response. The response to the ATI9 message is 06.57,A07.03 on module 02X-00 as mentioned on the webpage.

I had tried the NSOST command before, and verified again today. I get the same error: +CME ERROR: 4 (operation not supported)

Kind regards,

Ewoud

[Jan_Willem_Smeenk]

If we test this on one of our boards, it works without problems:

We tried:

AT+NSOSTF=0,"37.97.216.22",3000,0x200,12,"48656c6c6f20576f726c6421"

and it all goes fine. Can you maybe give us your complete AT sequence?

Which sim card are you using? (Did youy get it through SODAQ?)

[Ewoud_Smeur]

My full sequence is just like described on the AT Commands webpage:

AT+CSCON=1

OK
AT+CEREG=5

OK
AT+NPSMR=1

OK
AT+CPSMS=1,,,"00000001","00000001"

OK
AT+NCONFIG="CR_0354_0338_SCRAMBLING","TRUE"

OK
AT+NCONFIG="CR_0859_SI_AVOID","FALSE"

OK
AT+CFUN=0

OK

+CEREG: 0,"0000","0",7,,,,

+NPSMR: 0
AT+CGDCONT=1,"IP","nb.inetd.gdsp"

OK
AT+CFUN=1

+CEREG: 0,"0000","0",7,,,,

OK
AT+NBAND=20

OK
AT+CFUN=0

OK

+NPSMR: 0
AT+CFUN=1

+CEREG: 0,"0000","0",7,,,,

OK
AT+COPS=1,2,"20404"

OK

+CEREG: 2,"0000","0",7,,,,

+CSCON: 1

+CEREG: 5,"2BBF","18CCA67",7,,,"00000001","00011000"
AT+CGATT?

+CGATT: 1

OK

+CSCON: 0

+NPSMR: 1
AT+NSOCR="DGRAM",17,16666,0

0

OK
AT+NSOSTF=0,"37.97.216.22",3000,0x200,12,"48656c6c6f20576f726c6421"

ERROR
AT+CMEE=1

OK
AT+NSOSTF=0,"37.97.216.22",3000,0x200,12,"48656c6c6f20576f726c6421"

+CME ERROR: 4

Where I used your ip address to see if that would change anything, but no luck. The sim card is from Vodafone, but is acquired as part of an NB-IoT evaluation pack and not through SODAQ. Here is a photograph of my setup:

[Jan]

@Ewoud_Smeur

I was able to reproduce your issue.
When I am using an other Vodafone simcard with a different APN the sim is able to connect to the network.
I could open a socket but I also got the +CME ERROR: 4 when sending a packet.

1) Do you use the correct APN?
2) Is our IP whitelisted for your SIM?

Kind regards,
Jan

[Ewoud_Smeur]

@Jan
Thanks for your message! Indeed I was not using the correct APN, it should be ep.inetd.gdsp instead. Good catch, thanks! Now the module returns

0,12
OK

Which should indicate a successfully sent datagram. In the Vodafone m2m portal I can now see that the module was indeed connected (only after several hours), but it says zero bytes are transmitted. At my server, I receive nothing, while I verified that I can connect to the specified port via UDP from my laptop.

On the Vodafone portal, under History/Activiity list I can see several datasessions on one day, seemingly one for each message I tried to send, ending only when the next one starts, all with zero bytes:

The IP address of my server should be whitelisted, but perhaps something is wrong there? Any clues?