[En-Nut-Discussion] Sony Ericsson MUX protocol

[Brett Abbott]

Matej

Yes, that would be useful.  I watch for the Ring Indicator to indicate 
incoming messages or calls, alternately you can poll the modem on a 
regular basis.

MUX would be best option for interface where you need GPRS/CDMA, SMS and 
Data calls all at once.  In my case, this isnt required.

I'll post the changes for the PPP Pause when working but may be more 
than a couple of weeks away due to other client commitments.  If you 
need it now, have a quick look at 3.2.1 NutOS source in CVS, search for 
ppp_hackup in the ppp.c, ifconfig.c and pppsm.c.  The approach is likely 
to be similar.

Cheers
Brett

Matej Kupljen wrote:

>Hi
>
>  
>
>>This would be useful.
>>    
>>
>
>Indeed :-)
>
>  
>
>>Most cellular modems have the ability to switch in and out of command
>>mode (to issue AT commands) using the DTR signal.  If youre not using it
>>for hanging up, you can initialise the modem prior to dialling to
>>support this option.
>>    
>>
>
>Great. I'll check that.
>
>  
>
>>When you need to issue commands, you can pause PPP, lower DTR, issue
>>your command, return DTR and then resume PPP.  To get PPP paused in
>>earlier versions of NutOS, you use the ppp_hackup flag.  In latest
>>version you need to make a mod which does the same thing.  Im expecting
>>to implement this shortly by way of  issuing a _ioctl command (unless
>>someone has already done it?)
>>    
>>
>
>Please let me know, how you have done (will do)  this.
>
>There is another issue:
>Suppose you have a PPP session active over the GPRS.
>What happens if the SMS is received or somebody is dialing your modem?
>If you use MUX, you get RING or +CNMI on "AT Channel". 
>Does in this case you get notified by a DTR signal?
>
>BR,
>Matej
>
>
>  
>

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Brett Abbott, Managing Director, Digital Telemetry Limited
Email: Brett.Abbott at digital-telemetry.com
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