ofono and connecting to an APN

ofono and connecting to an APN

[Jan Pohanka]

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Hello,

excuse me for a newbie question, but I would like to know if ofono daemon  
is responsible for connecting a modem to APN for sending MMS or browsing  
internet. How it is usually done on devices using ofono? It is task for  
another daemon like connman or something similar? If yes how these daemons  
communicate with ofono when they are grabbing the interface for making ppp  
conection?

best regards
Jan

Re: ofono and connecting to an APN

[Denis Kenzior]

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Hi Jan,

> excuse me for a newbie question, but I would like to know if ofono
> daemon is responsible for connecting a modem to APN for sending MMS or
> browsing internet. How it is usually done on devices using ofono? It is

oFono is the one establishing the GPRS context.  Some other daemon makes 
the control decisions on what context should be established and when. 
e.g. connman makes this decision in the case of Type=internet contexts 
and something like mmsd makes this decision for Type=mms contexts.


> task for another daemon like connman or something similar? If yes how
> these daemons communicate with ofono when they are grabbing the
> interface for making ppp conection?
>

I'm not quite sure I understand the question?  The context establishment 
is achieved using org.ofono.ConnectionContext interface, e.g. by setting 
the 'Active' property.  The PPP connection is done by oFono itself.

Regards,
-Denis

Re: ofono and connecting to an APN

[Jan Pohanka]

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Hi Denis,

thank you for the answer.

>
> oFono is the one establishing the GPRS context.  Some other daemon makes  
> the control decisions on what context should be established and when.  
> e.g. connman makes this decision in the case of Type=internet contexts  
> and something like mmsd makes this decision for Type=mms contexts.

I will check mmsd thank you for the info. Do you know if it is a mature  
project? I mean if it can be used for basic mms sending?

>> task for another daemon like connman or something similar? If yes how
>> these daemons communicate with ofono when they are grabbing the
>> interface for making ppp conection?
>>
>
> I'm not quite sure I understand the question?  The context establishment  
> is achieved using org.ofono.ConnectionContext interface, e.g. by setting  
> the 'Active' property.  The PPP connection is done by oFono itself.

I'd like to use ofono to be able to do voice calls and sms messaging.
Without ofono, I'm able to connect to internet over PPP using pppd daemon  
with proper script using one of the modem interfaces (ttyUSBx/ttyACMx).  
Such connection can be done directly using ofono (without pppd)?

best regards
Jan

Re: ofono and connecting to an APN

[Denis Kenzior]

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Hi Jan,

>> oFono is the one establishing the GPRS context. Some other daemon
>> makes the control decisions on what context should be established and
>> when. e.g. connman makes this decision in the case of Type=internet
>> contexts and something like mmsd makes this decision for Type=mms
>> contexts.
>
> I will check mmsd thank you for the info. Do you know if it is a mature
> project? I mean if it can be used for basic mms sending?
>

It should be complete enough to allow basic mms send and receive, yes. 
However, the project is not (yet) up to the same level of maturity / 
quality / stability as oFono.

>>> task for another daemon like connman or something similar? If yes how
>>> these daemons communicate with ofono when they are grabbing the
>>> interface for making ppp conection?
>>>
>>
>> I'm not quite sure I understand the question? The context
>> establishment is achieved using org.ofono.ConnectionContext interface,
>> e.g. by setting the 'Active' property. The PPP connection is done by
>> oFono itself.
>
> I'd like to use ofono to be able to do voice calls and sms messaging.
> Without ofono, I'm able to connect to internet over PPP using pppd
> daemon with proper script using one of the modem interfaces
> (ttyUSBx/ttyACMx). Such connection can be done directly using ofono
> (without pppd)?

oFono has its own internal ppp stack, no pppd is required.  If your 
modem supports a high-speed interface, then that should be used instead.

And yes, you can do voice calls, sms and internet at the same time with 
oFono.  Assuming of course you have at least two ttys available or your 
modem supports multiplexing.

Regards,
-Denis

Re: ofono and connecting to an APN

[Jan Pohanka]

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Hi Denis.

> oFono has its own internal ppp stack, no pppd is required.  If your  
> modem supports a high-speed interface, then that should be used instead.
>
> And yes, you can do voice calls, sms and internet at the same time with  
> oFono.  Assuming of course you have at least two ttys available or your  
> modem supports multiplexing.

Could you please give me some example how to connect a device to internet  
through ofono? When I use pppd I can see a new pppd interface in ifconfig.  
Can ofono do the same?

I know the test scripts in ofono/test directory, but does there exist any  
more complex ofono client which one can use as a reference?

best regards
Jan


-- 
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Re: ofono and connecting to an APN

[Denis Kenzior]

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Hi Jan,

On 11/07/2012 08:46 AM, Jan Pohanka wrote:
> Hi Denis.
>
>> oFono has its own internal ppp stack, no pppd is required. If your
>> modem supports a high-speed interface, then that should be used instead.
>>
>> And yes, you can do voice calls, sms and internet at the same time
>> with oFono. Assuming of course you have at least two ttys available or
>> your modem supports multiplexing.
>
> Could you please give me some example how to connect a device to

- test/enable-modem
- test/online-modem
- Wait for Attached Property on ConnectionManager interface to go to True
- test/activate-context
- test/process-context-settings

> internet through ofono? When I use pppd I can see a new pppd interface
> in ifconfig. Can ofono do the same?

Yes

>
> I know the test scripts in ofono/test directory, but does there exist
> any more complex ofono client which one can use as a reference?
>

Try the ofono plugin in connman.  In fact, connman can already manage 
internet connections through ofono very well.

Regards,
-Denis

Re: ofono and connecting to an APN

[Jan Pohanka]

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Hi Denis,

thank you for advices again.

>>> And yes, you can do voice calls, sms and internet at the same time
>>> with oFono. Assuming of course you have at least two ttys available or
>>> your modem supports multiplexing.
>>
>> Could you please give me some example how to connect a device to
>
> - test/enable-modem
> - test/online-modem
> - Wait for Attached Property on ConnectionManager interface to go to True
> - test/activate-context
> - test/process-context-settings

Just one additional question here

$ ./test/process-context-settings
Configuring /telit2_0/context1
     Interface is ppp0
     IP address is 10.9.8.171
     Gateway is 0.0.0.0
     Nameserver is 10.168.38.53
     Nameserver is 10.168.38.53
route: SIOCADDRT: File exists


Where these settings (addresses) come from (dhcp?), and why there is no  
correct gateway? I'm also wondering if these commands are connecting  
through GPRS or through 3G if I have 3G modem.

best regards
Jan

Re: ofono and connecting to an APN

[Denis Kenzior]

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Hi Jan,

> Just one additional question here
>
> $ ./test/process-context-settings
> Configuring /telit2_0/context1
> Interface is ppp0
> IP address is 10.9.8.171
> Gateway is 0.0.0.0
> Nameserver is 10.168.38.53
> Nameserver is 10.168.38.53
> route: SIOCADDRT: File exists
>
>
> Where these settings (addresses) come from (dhcp?), and why there is no
> correct gateway? I'm also wondering if these commands are connecting
> through GPRS or through 3G if I have 3G modem.

There is no DHCP in GSM.  The settings are obtained via underlying 
network to mobile signaling.  How they are provided to the telephony 
stack varies.  In the case of PPP it is done via IPCP.  Some modems fake 
a DHCP server in their firmware, and some provide the settings via AT 
commands.

There is no gateway because the link is point-to-point, it isn't necessary.

For your question regarding GPRS vs 3G.  The commands used are the same. 
  The modem capability and network availability will determine the 
technology used.  Really the only difference will be the speed you 
connect at.  PPP is too slow for true 3G speeds.  This is why most modem 
manufacturers have switched to high-speed interfaces (e.g. faked 
ethernet) or other special extensions.

Regards,
-Denis

>
> best regards
> Jan
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