ubuntu-phone team mailing list archive

[Thomas Voß <thomas.voss@xxxxxxxxxxxxx>]

On Sun, Apr 26, 2015 at 1:45 PM, sturmflut <sturmflut@xxxxxxxxxxxxxx> wrote:
> Hi Thomas,
>
>
> On 26.04.2015 06:20, Thomas Voß wrote:
>> Hey all,
>>
>> thanks for the great script, I will make sure that we fold the color
>> coding capabilities into the client executable of the location
>> service.
>> As far as I can see, "green" indicates that the snr exceeds a certain
>> threshold (11 in the awk script). While snr is an interesting value,
>> the more interesting information is "used_in_fix", "has_almanac_data"
>> and "has_ephimeris_data". Even if multiple satellites are visible
>> (with a sensible snr), only
>> those for which almanac and ephimeris data is known are considered for
>> calcucating the fix. http://en.wikipedia.org/wiki/Time_to_first_fix
>> provides a good overview.
>>
>> With that, green should probably refer to satellites that have
>> "used_in_fix" set to 1.
>>
>> The theoretical minimum for a first fix after cold start is 12.5
>> minutes, which is rarely the case and ttf usually takes longer in cold
>> start scenarios.
>> We take multiple measures to minimize this time, but it seems like we
>> are experiencing issues in doing so. It would be really helpful if you
>> could provide the output of:
>>
>>     sudo GLOG_v=1000 GLOG_logtostderr=1 ubuntu-location-serviced-cli
>> --bus system --test
>>
>> Feel free to share privately with me as the logs would reveal your
>> position. Source for the test is in [1].
>> Please note that you should restart your device after the test has
>> been completed.
>
>
> Is there a way to directly talk to the location-service via D-Bus from
> within a confined app? And if yes, what would the calls look like? I tried
>

Sure, given that you have the right apparmor permissions and that a
user accepted the trust prompt.
If possible, please rely on:

  http://bazaar.launchpad.net/~phablet-team/platform-api/trunk/files/head:/include/ubuntu/application/location/

to interface with the location service.

Cheers,

  Thomas

> dbus-send --print-reply --type=method_call --system
> --dest=com.ubuntu.location.Service /com/ubuntu/location/Service
> org.freedesktop.DBus.Introspectable.Introspect
>
> on the phone but it just gives me an empty list of methods to call.
>
> I have to say that I'm not that good with D-Bus though :/
>
>
> kind regards,
> Simon
>
>
>
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