Huawei E3372

[Christophe Ronco <c.ronco@kerlink.fr>]

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Hi,

I try to connect using a USB dongle. It is a Huawei E3372h-153. I will 
try to give information on this modem because looking at Internet, it 
seems that E3372 is a generic name for different hardwares (or firmwares?).

Before usb_modeswitch my USB dongle present itself as a CDROM and a mass 
storage media with these vendor and product ids:

usb 1-1: New USB device found, idVendor=12d1, idProduct=15cf

After usb_modeswitch, product id changes:

usb 1-1: New USB device found, idVendor=12d1, idProduct=15b7

And devices are:

  - 2 serial ports:

[   16.010158] option 1-1:1.0: GSM modem (1-port) converter detected
[   16.065118] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB0
[   16.141589] option 1-1:1.1: GSM modem (1-port) converter detected
[   16.208587] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1

  - a CDC NCM net device (/dev/cdc-wdm0):

[   16.358721] huawei_cdc_ncm 1-1:1.2: MAC-Address: 00:1e:10:1f:00:00
[   16.417550] huawei_cdc_ncm 1-1:1.2: NDP will be placed at end of 
frame for this device.
[   16.455455] huawei_cdc_ncm 1-1:1.2: cdc-wdm0: USB WDM device
[   16.520626] huawei_cdc_ncm 1-1:1.2 wwan0: register 'huawei_cdc_ncm' 
at usb-ci_hdrc.0-1, Huawei CDC NCM device, 00:1e:10:1f:00:00

  - a mass storage device


Using ATI, modem present itself like that:

Manufacturer: huawei
Model: E3372H
Revision: 21.315.01.00.314
IMEI: XXXX
+GCAP: +CGSM,+DS,+ES


Using an unmodified Ofono, I fail to activate gprs context:

Feb 14 08:43:55 klk-lpbs-040070 daemon.debug ofonod[1238]: 
../git/drivers/atmodem/gprs-context.c:at_gprs_activate_primary() cid 1
Feb 14 08:43:55 klk-lpbs-040070 daemon.info ofonod[1238]: Modem: > 
AT+CGDCONT=1,"IP","orange.m2m.spec"\r
Feb 14 08:43:55 klk-lpbs-040070 daemon.info ofonod[1238]: Modem: < 
\r\nOK\r\n
Feb 14 08:43:55 klk-lpbs-040070 daemon.debug ofonod[1238]: 
../git/drivers/atmodem/gprs-context.c:at_cgdcont_cb() ok 1
Feb 14 08:43:55 klk-lpbs-040070 daemon.info ofonod[1238]: Modem: > 
AT+CGDATA="PPP",1\r
Feb 14 08:43:55 klk-lpbs-040070 daemon.info ofonod[1238]: Modem: < 
\r\n+CME ERROR: 50\r\n
Feb 14 08:43:55 klk-lpbs-040070 daemon.debug ofonod[1238]: 
../git/drivers/atmodem/gprs-context.c:at_cgdata_cb() ok 0
Feb 14 08:43:55 klk-lpbs-040070 daemon.info ofonod[1238]: Unable to 
enter data state
Feb 14 08:43:55 klk-lpbs-040070 daemon.debug ofonod[1238]: 
../git/src/gprs.c:pri_activate_callback() 0x41f4f8
Feb 14 08:43:55 klk-lpbs-040070 daemon.debug ofonod[1238]: 
../git/src/gprs.c:pri_activate_callback() Activating context failed with 
error: Incorrect parameters


So activation fails because AT+CGDATA="PPP",1 fails. Here is what this 
modem claims to support:

AT+CGDATA=?
+CGDATA: ("NULL")

OK

I didn't try to send AT+CGDATA="NULL",1 before PPP setup. Instead I used 
ATD*99***1#. So I modified function at_cgdcont_cb in 
drivers/atmodem/gprs-context.c to send this command instead of 
AT+CGDATA="PPP",1 and I managed to connect. Here are the traces:

Feb 14 08:57:30 klk-lpbs-040070 daemon.debug ofonod[1252]: 
../git/drivers/atmodem/gprs-context.c:at_gprs_activate_primary() cid 1
Feb 14 08:57:30 klk-lpbs-040070 daemon.info ofonod[1252]: Modem: > 
AT+CGDCONT=1,"IP","orange.m2m.spec"\r
Feb 14 08:57:30 klk-lpbs-040070 daemon.info ofonod[1252]: Modem: < 
\r\nOK\r\n
Feb 14 08:57:30 klk-lpbs-040070 daemon.debug ofonod[1252]: 
../git/drivers/atmodem/gprs-context.c:at_cgdcont_cb() ok 1
Feb 14 08:57:30 klk-lpbs-040070 daemon.info ofonod[1252]: Modem: > 
ATD*99***1#\r
Feb 14 08:57:30 klk-lpbs-040070 daemon.info ofonod[1252]: Modem: < 
\r\nCONNECT\r\n
Feb 14 08:57:30 klk-lpbs-040070 daemon.debug ofonod[1252]: 
../git/drivers/atmodem/gprs-context.c:at_cgdata_cb() ok 1
Feb 14 08:57:30 klk-lpbs-040070 daemon.debug ofonod[1252]: 
../git/drivers/atmodem/gprs-context.c:setup_ppp()
Feb 14 08:57:30 klk-lpbs-040070 daemon.info ofonod[1252]: PPP: lcp: 
pppcp_generate_event: current state 0:INITIAL

... (PPP debug)

Feb 14 08:57:33 klk-lpbs-040070 daemon.info ofonod[1252]: PPP: 
../git/gatchat/gatppp.c:ppp_enter_phase() 4
Feb 14 08:57:33 klk-lpbs-040070 daemon.debug ofonod[1252]: 
../git/drivers/atmodem/gprs-context.c:ppp_connect()
Feb 14 08:57:33 klk-lpbs-040070 daemon.info ofonod[1252]: IP: 10.47.149.108
Feb 14 08:57:33 klk-lpbs-040070 daemon.info ofonod[1252]: DNS: 
192.168.10.110, 194.51.3.56
Feb 14 08:57:33 klk-lpbs-040070 daemon.debug ofonod[1252]: 
../git/src/gprs.c:pri_activate_callback() 0x3654e8


My problem now is how to know if I should send AT+CGDATA="PPP",1 or 
ATD*99***1# when activating context in@modem driver. I see in this 
driver and others that a VENDOR information can be sent from plugin but 
I imagine that other Huawei devices support AT+CGDATA="PPP",1.

Do you have any idea of what I should do to support this modem without 
disturbing other devices?

Christophe


PS: I am aware that using PPP to connect this modem might not be the 
best solution. I spent days to try to get interface wwan0 up. I managed 
to get IP address, gateway and DNS servers for this interface using 
something similar to what is done in telitmodem/gprs-context-ncm.c (I 
might send traces if someone is interested) but I never managed to send 
or receive a packet on wwan0 interface. Problem might come from my 
kernel (4.1) even if I applied all patches from Vanilla linked to 
drivers/net/usb/cdc_ncm.c, drivers/net/usb/huawei_cdc_ncm.c or 
drivers/usb/class/cdc-wdm.c.