GPRS unreliable: long lasting connection fail
niccolo at rigacci.org
Mon Jan 12 11:25:27 CET 2009
On Mon, Jan 12, 2009 at 09:41:57AM +0000, Tom Yates wrote:
>> 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!
I use a car lighter adapter :-)
> 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)
I can pass from cell to cell through long highway tunnels and the
GSM modem handles the connection recover transparently, pppd does
not notice it. But if the pppd notice the failure (due LCP echo
request timeout), it cannot recover.
I had experience of PPP over DSL lines, where "persist" and
"holdoff" parameters did the trick, but it seems that pppd on the
FreeRunner has a bug.
Firenze - Italy
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