[Gta04-owner] [Community] About cost and business models for community hardware

Lukas Maerdian luk at slyon.de
Tue Sep 29 21:09:41 CEST 2015

Am 29.09.2015 um 20:45 schrieb Neil Jerram:
> On 25/09/15 19:52, Lukas Maerdian wrote:
>> Am 25.09.2015 um 20:30 schrieb H. Nikolaus Schaller:
>>>>> * stable modem is IMHO already shown with Replicant (there are some
>>>>> tricks to stabilize the modem)
>>>>> That's interesting.  Can you give or point to more details?
>>>>> Specifically, is there now an effective recipe for:
>>>>> - detecting when the modem has gone into a bad state
>>>>> - restarting it?
>>> Lukas can comment better on this.
>> I did not run any longtime tests (or special tests for modem stability),
>> but in my normal tests I could not observe this problem.
>> Neither did I get any reports about this problem from other users.
>> I remember the problem had something todo/could be influcenced by the
>> AT_OPSYS command, which can be switched from the Android Settings GUI
>> [1], if somebody wants to run some tests.
> Yes.  I believe AT_OPSYS=3,2 allows the modem to use 3G, whereas
> AT_OPSYS=0,2 tells it to use 2G only.
> With AT_OPSYS=3,2, last time I tried, a modem reset could be observed
> within about 5 minutes by enabling and using 3G data while in a moving
> train.

Well, usually I'm not testing in moving trains, so this might be a
reason why 3G data was working nicely for me up to now.

>> Another quirk which was introduced to better support our modem is a
>> workaround for the broken AT+VTS command in the firmware.
> Pointer, for posterity?

Here you go:


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