wwan0 interface without IP

wwan0 interface without IP

[Eric BOUXIROT]

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hi !!

i'm back with my project using ofono/connman/sierra 3G modem...

now my modem work fine with ofono until connection. i can see IP 
address with ofono in debug mode (response from !SCPADDR command)
interface wwan0 is UP... but without IPV4 parameters.. (only MAC 
address)
i can't go to internet with this.

i have try to put connman in debug mode too, and get an error because 
IPAddress is not set.

at this time, if i start udhcpc -i wwan0... connection is made and work 
fine....

few seconds only after a very short time, connman say idle timeout and 
ofono goes offline.

i mean there is something wrong in ofono... (or connman ? don't know..)

someone can help me ?

thank you so much

Re: wwan0 interface without IP

[Denis Kenzior]

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Hi Eric,

On 03/28/2014 06:41 AM, Eric BOUXIROT wrote:
> hi !!
> 
> i'm back with my project using ofono/connman/sierra 3G modem...
> 
> now my modem work fine with ofono until connection. i can see IP address
> with ofono in debug mode (response from !SCPADDR command)
> interface wwan0 is UP... but without IPV4 parameters.. (only MAC address)
> i can't go to internet with this.

oFono does not assign the IP parameters.  ConnMan does that or you need
to do this some other way.

> 
> i have try to put connman in debug mode too, and get an error because
> IPAddress is not set.
> 
> at this time, if i start udhcpc -i wwan0... connection is made and work
> fine....
> 
> few seconds only after a very short time, connman say idle timeout and
> ofono goes offline.
> 
> i mean there is something wrong in ofono... (or connman ? don't know..)
> 
> someone can help me ?

Not really enough information.  If oFono establishes the connection
successfully, then likely you need to look more closely at what is
happening with ConnMan.

Regards,
-Denis

Re: wwan0 interface without IP

[Eric BOUXIROT]

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> oFono does not assign the IP parameters.  ConnMan does that or you need
> to do this some other way.

i'm right with you but i don't know how ofono deal with connman to trig 
DHCP.
i know ofono send some parameters (or connman read it on ofono..) like 
"method" "address" etc..
i know when reading "address" the result is NULL and fail next step in 
connman du to NULL.

i have made a test patch that put "0.0.0.0" in address in 
swmodem/gprs_context.c after connect success, but it seem connman 
always read NULL..


then, i search more what's happend.
I found a solution with connman's ofono plugin that need to be patched.

Now that work great, but i mean there something wrong between 
ofono/connman altought for this modem.

Re: wwan0 interface without IP

[Denis Kenzior]

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Hi Eric,

On 03/28/2014 10:35 AM, Eric BOUXIROT wrote:
>> oFono does not assign the IP parameters.  ConnMan does that or you need
>> to do this some other way.
> 
> i'm right with you but i don't know how ofono deal with connman to trig
> DHCP.
> i know ofono send some parameters (or connman read it on ofono..) like
> "method" "address" etc..
> i know when reading "address" the result is NULL and fail next step in
> connman du to NULL.
> 

After activating the context, run test/list-contexts in oFono git.  What
does it say?

Regards,
-Denis

Re: wwan0 interface without IP

[Eric BOUXIROT]

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> After activating the context, run test/list-contexts in oFono git.  What
> does it say?

/usr/lib/ofono/test/list-contexts
[ /sierra_1 ]
    [ /sierra_1/context1 ]
        Username =
        Protocol = ip
        Name = Internet
        Settings = { Interface=wwan0 Method=dhcp }
        IPv6.Settings = { }
        Active = 1
        AccessPointName = objcPpublic
        Password =
        Type = internet

for me it's ok. i have made a test to add a "address" to 0.0.0.0 and 
get this.

/usr/lib/ofono/test/list-contexts
[ /sierra_1 ]
    [ /sierra_1/context1 ]
        Username =
        Protocol = ip
        Name = Internet
        Settings = { Interface=wwan0 Method=dhcp Address=0.0.0.0 }
        IPv6.Settings = { }
        Active = 1
        AccessPointName = objcPpublic
        Password =
        Type = internet

but in either cases i got connman getting an address..

Re: wwan0 interface without IP

[Eric BOUXIROT]

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> oFono does not assign the IP parameters.  ConnMan does that or you need
> to do this some other way.

forget to tell, i must apply this patch too, because my modem do not 
reconize the command and ofono fail.

diff -uprN a/drivers/swmodem/gprs-context.c 
b/drivers/swmodem/gprs-context.c
--- a/drivers/swmodem/gprs-context.c	2012-07-02 09:55:34.000000000 
+0200
+++ b/drivers/swmodem/gprs-context.c	2014-03-27 23:08:44.904767915 
+0100
@@ -100,9 +100,6 @@ static void at_scact_up_cb(gboolean ok,
 	snprintf(buf, sizeof(buf), "AT!SCPADDR=%u", gcd->active_context);
 	g_at_chat_send(gcd->chat, buf, none_prefix, NULL, NULL, NULL);

-	snprintf(buf, sizeof(buf), "AT+CGCONTRDP=%u", gcd->active_context);
-	g_at_chat_send(gcd->chat, buf, none_prefix, NULL, NULL, NULL);
-
 	modem = ofono_gprs_context_get_modem(gc);
 	interface = ofono_modem_get_string(modem, "NetworkInterface");