GPRS unreliable: long lasting connection fail
madhatter at teaparty.net
Mon Jan 12 10:41:57 CET 2009
On Mon, 12 Jan 2009, Niccolo Rigacci wrote:
> On Mon, Jan 12, 2009 at 08:13:56AM +0000, Tom Yates wrote:
>> i use 2008.12 with gsm0710uxd, and i've had fairly long travelling GPRS
>> calls (15-20 minutes on the train back from london).
> Please tell me: with gsm0710uxd the connection is still done by
it definitely is. read my writeup at
http://www.teaparty.net/technotes/openmoko-2.html#GPRS if you want to see
exactly what i'm doing (my writeup's about 2008.09, but it's identical to
the setup i just did for 2008.12 save that gsm0710muxd was in the
repository so i didn't have to get the packages manually.
> I hope to last 12 hours or so, because I do GPS live tracking
> with position upload to the internet every 5/10 seconds.
my battery won't last that long!
> But the real problem is that if the connection fails, it will not
> restart again. I can add a cronjob to test connection and restart
> it, but I know that pppd should manage the fault.
i have *definitely* had pppd drop and autorecover the connection on
shorter calls (eg, on the train - the cambridge-london line has tunnels on
it, which provide a handy means of testing drop/recover).
i'm not sure that pppd is handling the autorecovery, though; i have a
vague feeling it's the call handling between the calypso chip and the base
station(s) that are responsible for setting up my GPRS connection again).
i can post my ppp and ping logs next time i see this behaviour, if you'd
like, so we can see if ppp even appears to notice the outage?
Tom Yates - http://www.teaparty.net
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