[ECOS] PPP disconnect script

[ECOS] PPP disconnect script

[Felix Nielsen]

Hi

I am trying to get a persistent connection up and running using a GRPS 
modem. After successful connection, at some point the connection is 
dropped from the ISP provider, and I need to re-connect automatically.

Have enabled (=1) :

"extern int    persist;    /* Reopen link after it goes down */"

But before I can launch the connection again, I need to fire "+++" to 
the modem, so the modem is ready again. I have been looking in the 
source, and found :

"extern char    *disconnector;    /* Script to disestablish physical 
link */"

But how do I initialize that script?

Any hints or examples would be appreciated.

Thanks
Felix


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Re: [ECOS] PPP disconnect script

[Nick Garnett]

Felix Nielsen <felix@dezign.dk> writes:

> Hi
> 
> I am trying to get a persistent connection up and running using a GRPS
> modem. After successful connection, at some point the connection is
> dropped from the ISP provider, and I need to re-connect automatically.
> 
> Have enabled (=1) :
> 
> "extern int    persist;    /* Reopen link after it goes down */"
> 
> But before I can launch the connection again, I need to fire "+++" to
> the modem, so the modem is ready again. I have been looking in the
> source, and found :
> 
> "extern char    *disconnector;    /* Script to disestablish physical
> link */"
> 
> But how do I initialize that script?
> 
> Any hints or examples would be appreciated.


I don't believe persistence has been extensively tested. Looking at
the code it should work, however I cannot guarantee that some part of
it was stripped out when porting to eCos.

All scripting support was also removed. eCos has no scripting
language. If all you want to do is send the modem some simple
commands, then use a chat script.

Alternatively, both of these things can be handled outside the current
stack. Just set up a thread to monitor the PPP connection and have it
run something like this:

void ppp_monitor( CYG_ADDRWORD arg )
{
        cyg_ppp_options_t options;
        cyg_ppp_handle_t ppp_handle;

        cyg_ppp_options_init( &options );

        /* Adjust the options here */

        while( ppp_persist )
        {
            /* Do any connection establishment processing here */

            ppp_handle = cyg_ppp_up( ppp_device, &options );

            cyg_ppp_wait_up( ppp_handle );

            cyg_ppp_wait_down( ppp_handle );

            /* Do any connection dis-establishment processing here */

        }
}

-- 
Nick Garnett                    eCos Kernel Architect
http://www.ecoscentric.com/     The eCos and RedBoot experts


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Re: [ECOS] PPP disconnect script

[Felix Nielsen]

Hi Nick,

Thanks I will try that :)

The "persist" seems to work just fine, the stack is trying to 
re-connect, when the ISP fails or no activity. But the connect fails if 
the modem is not ready to receive the initializing commands.

I thought that maybe it was possible to specify a chat disconnect script.

But I will debug some more :)

Felix

Nick Garnett wrote:

>Felix Nielsen <felix@dezign.dk> writes:
>
>  
>
>>Hi
>>
>>I am trying to get a persistent connection up and running using a GRPS
>>modem. After successful connection, at some point the connection is
>>dropped from the ISP provider, and I need to re-connect automatically.
>>
>>Have enabled (=1) :
>>
>>"extern int    persist;    /* Reopen link after it goes down */"
>>
>>But before I can launch the connection again, I need to fire "+++" to
>>the modem, so the modem is ready again. I have been looking in the
>>source, and found :
>>
>>"extern char    *disconnector;    /* Script to disestablish physical
>>link */"
>>
>>But how do I initialize that script?
>>
>>Any hints or examples would be appreciated.
>>    
>>
>
>
>I don't believe persistence has been extensively tested. Looking at
>the code it should work, however I cannot guarantee that some part of
>it was stripped out when porting to eCos.
>
>All scripting support was also removed. eCos has no scripting
>language. If all you want to do is send the modem some simple
>commands, then use a chat script.
>
>Alternatively, both of these things can be handled outside the current
>stack. Just set up a thread to monitor the PPP connection and have it
>run something like this:
>
>void ppp_monitor( CYG_ADDRWORD arg )
>{
>        cyg_ppp_options_t options;
>        cyg_ppp_handle_t ppp_handle;
>
>        cyg_ppp_options_init( &options );
>
>        /* Adjust the options here */
>
>        while( ppp_persist )
>        {
>            /* Do any connection establishment processing here */
>
>            ppp_handle = cyg_ppp_up( ppp_device, &options );
>
>            cyg_ppp_wait_up( ppp_handle );
>
>            cyg_ppp_wait_down( ppp_handle );
>
>            /* Do any connection dis-establishment processing here */
>
>        }
>}
>
>  
>


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Re: [ECOS] PPP disconnect script

[Nick Garnett]

Felix Nielsen <felix@dezign.dk> writes:

> Hi Nick,
> 
> Thanks I will try that :)
> 
> The "persist" seems to work just fine, the stack is trying to
> re-connect, when the ISP fails or no activity. But the connect fails
> if the modem is not ready to receive the initializing commands.
> 
> I thought that maybe it was possible to specify a chat disconnect script.

Since the call to chat() is inside the main loop, it will be invoked
each time around the reconnect loop. So a chat script that just sends
the "+++" each time should work. Actually, maybe not, since there are
timing constraints on the speed at which the "+++" is received by the
modem.

You have the sources, so you could just modify the loop to call out to
a routine of your own after the disconnection.

-- 
Nick Garnett                    eCos Kernel Architect
http://www.ecoscentric.com/     The eCos and RedBoot experts


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Re: [ECOS] PPP disconnect script

[silpol]

Hi Felix & Nick,

It looks like ISP (heh, you can't make ISP out of telecom ;) is _not_
failing... Typical GPRS connection has yet another status "idle", but
common PPP driver (BSD one) doesn't have such thing if  I don't miss
anything. Any GPRS-capable terminal MUST be able to go in idle after
either timeout on inactivity or on message from SGSN (I could be wrong
- last time I touched GPRS network side code more than 2 years ago) -
this is done to save bandwidth, terminal's battery, etc.  To make long
things short - common BSD PPP driver should be modified in order to
handle things properly with GPRS.

More details you can find at 3gpp.org .

BR, Andrej

On Mon, 05 Jul 2004 15:42:46 +0200, Felix Nielsen <felix@dezign.dk> wrote:
> Hi Nick,
> 
> Thanks I will try that :)
> 
> The "persist" seems to work just fine, the stack is trying to
> re-connect, when the ISP fails or no activity. But the connect fails if
> the modem is not ready to receive the initializing commands.
> 
> I thought that maybe it was possible to specify a chat disconnect script.
> 
> But I will debug some more :)
> 
> Felix
> 
> 
> 
> Nick Garnett wrote:
> 
> >Felix Nielsen <felix@dezign.dk> writes:
> >
> >
> >
> >>Hi
> >>
> >>I am trying to get a persistent connection up and running using a GRPS
> >>modem. After successful connection, at some point the connection is
> >>dropped from the ISP provider, and I need to re-connect automatically.
> >>
> >>Have enabled (=1) :
> >>
> >>"extern int    persist;    /* Reopen link after it goes down */"
> >>
> >>But before I can launch the connection again, I need to fire "+++" to
> >>the modem, so the modem is ready again. I have been looking in the
> >>source, and found :
> >>
> >>"extern char    *disconnector;    /* Script to disestablish physical
> >>link */"
> >>
> >>But how do I initialize that script?
> >>
> >>Any hints or examples would be appreciated.
> >>
> >>
> >
> >
> >I don't believe persistence has been extensively tested. Looking at
> >the code it should work, however I cannot guarantee that some part of
> >it was stripped out when porting to eCos.
> >
> >All scripting support was also removed. eCos has no scripting
> >language. If all you want to do is send the modem some simple
> >commands, then use a chat script.
> >
> >Alternatively, both of these things can be handled outside the current
> >stack. Just set up a thread to monitor the PPP connection and have it
> >run something like this:
> >
> >void ppp_monitor( CYG_ADDRWORD arg )
> >{
> >        cyg_ppp_options_t options;
> >        cyg_ppp_handle_t ppp_handle;
> >
> >        cyg_ppp_options_init( &options );
> >
> >        /* Adjust the options here */
> >
> >        while( ppp_persist )
> >        {
> >            /* Do any connection establishment processing here */
> >
> >            ppp_handle = cyg_ppp_up( ppp_device, &options );
> >
> >            cyg_ppp_wait_up( ppp_handle );
> >
> >            cyg_ppp_wait_down( ppp_handle );
> >
> >            /* Do any connection dis-establishment processing here */
> >
> >        }
> >}
> >
> >
> >
> 
> --
> Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
> and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
> 
>

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