Failed to get 4g data session with EM7565

IoT Modules MC/EM Series
1

Hello,

Previously I had an EM7455 modem for a 4g connection.
It worked well and i used following commands to get a 4g data session :

AT+CFUN=1
OK
AT+CPIN="0000"
OK
AT+CGDCONT=1,"IPV4V6","orange"
OK
AT$QCPDPP=1
OK
AT!SELRAT=06
OK
AT!SCACT=1,1
OK

But I changed the modem to use an EM7565.
I kept the same commands, but now it fails and i get the following error

AT+CFUN=1
OK
AT+CPIN="0000"
OK
AT+CGDCONT=1,"IPV4V6","orange"
OK
AT$QCPDPP=1
OK
AT!SELRAT=06
OK
AT!SCACT=1,1
+CME ERROR: no network service

I did many retries but, still the same result.

More details about the EM7565 :

ATI
Manufacturer: Sierra Wireless, Incorporated
Model: EM7565
Revision: SWI9X50C_00.03.05.00 5392ec jenkins 2017/06/13 21:39:43
MEID: 35926008000206
ESN: 12805733080, 80577AD8
IMEI: 359260080002063
IMEI SV:  1
FSN: UF735586450406
+GCAP: +CGSM

AT!PRIID?
PRI Part Number: 9907344
Revision: 001.000
Customer: Generic-M2M

Carrier PRI: 9999999_9907259_SWI9X50C_00.03.05.00_00_GENERIC_001.001_000

Do you have any idea why it does not work with the new modem, maybe an other AT command to use, or other …
Do I miss something ??

Thanks,

Thomas

PS : I use GobiNet (2017-10-30/SWI_2.48) and GobiSerial (2017-10-30/SWI_2.30) drivers for this modem

2

Thomas,

The firmware you have is really old, am surprised it is not rebooting when you issue the command, you need to contact your commercial channel to get the latest greatest.

Regards

Matt

3

Hi Matt,

In fact i have 2 identical EM7565 modems (one inside a system, and one external for dev) and i have one which returns ERROR to the AT!SCACT=1,1 command (internal, it is probably in USB3) , and one which reboot (external, it is probably in USB2 ).

I tried this modem with NetwokManager/ModemManager on Ubuntu Xenial, and it worked.
So i tracked AT commands sent by the ModemManager, and i found that it does not use the AT!SCACT=1,1 command.
But it uses the following command : ATD*99***1#
Do you have any idea/explanations why it uses this way.

I’ll ask for a new firmware version.
Do you think the commands i used for the EM7455 will work for the EM7565 (with latest firmware) ??

Thanks for help,

Thomas

4

Thomas,

The reason that the modem manager uses atd is because it is the mechanism used for modems to perform a call/data connection since the 70’s so it universally works regardless of whether you are using a v42bis analogue modem all the way through to the latest greatest LTE pro one. However it was never designed with the sort of speeds or interfaces in mind that we have now so there are draw backs meaning that most of the other methods are either OEM or chipset proprietary.

Re the commands that you have mentioned above yes they will work, I have tested them on my unit using Vodafone UK this morning (minus the username and password although I checked this command is also supported) and it worked fine.

FYI last night we produced release 9 so you should try to get this although release 8 will work perfectly well (has a minor bug that it puts the unit into MBIM when upgraded but you can easily change that with at+usbcomp).

Regards

Matt

5

Matt,

Thanks for the explanation, i understand now.
Last question, i did not found any firmware release for EM7565 on your web site.
Where can i find it ??

Thanks for the support

6

As I say release 9 has just come out and you need to go through your commercial channel for support which you should have because they have only really been available on request to this point (some did get into Digikey for general buying but other wise it would have been through the authorised distribution network).

R9 will get onto the source within the next couple of weeks.

Regards

Matt

7

Hi Matt,

I confirm, it works with new firmware release 9
But it also requires last version of Gobi drivers (Serial and Net) : version S2.31N2.50

With an older version of the Gobi drivers i received an OK after “AT!SCACT=1,1”, but i failed to get an ip address.

Issue is closed.

Thanks Matt for the support.