[announce] LocationRequestor module (location API) !

[cyke64]

hello ,

Hey it's a great day today (so many apps and new modules !) Perhaps a new version of PyS60 (1.3.22 ?)

mwibbels has created and publish another GPS module : locationrequestor.pyd implementing symbian location API ...

LocationRequestor is a Python extension that allows access to the Location Acquisition API (which connects to, for example, an internal and/or external GPS). It supports both blocking calls and callbacks. It is based on the 'lbsreference' example in the Symbian SDK.

links : LocationRequestor module (source,2ndFP2+3rd binaries+API documentation)

EDIT : don't download the package on the site it's broken
I remove temporarly the old links

ContextWatcher site
locationrequestor for 2nd FP2
locationrequestor for 3rd unsigned
locationrequestor source

PS : There's another lib from bergerc forumer for GPS : gps_location.pyd

[cyke64]

to mwibbels :

feedback :
- example code in source file is only in the doc file ! Please put it in a test_locationrequestor.py file ...
- the locationrequestor.py stub is not needed now (this bug has been fixed now !) the part with testing pyd file ...
- When I try the example code I have the following error :
line 10 : TypeError : locationRequestor() takes exactly 2 arguments (0 given)
Have you got this one ?

Tested with N95 and pys60 1.3.21

Thanks

[cyke64]

it's me again

When I look in the source code I found differences between the locationrequestor.py installed in c:\ressource on the device and in the source code (constant definition are missing in the device at least in the 3rd edition

BR
Cyke64

[tsharju]

For 2nd edition the .sis package does not even include the locationrequestor.py script and it complains that these constant definitions are missing. This would be a great library and I would want to start using it. Has someone contacted the developers to get this fixed? Should be simple since it just seems that no one has tested these packages before releasing them.

- Teemu

[mwibbels]

Yes, someone has

I don't know what happened there, must have had a bad day, I obviously posted a mixup of versions .

I just tested the stuff again on 2nd and for me it works. These same sources work in the emulator on 3rd (N95 is at work but I'm not). I put them here temporarily, they will appear at the site mentioned at the start of this thread in time.

Let me know if there still are problems (lost my confidence now ...)

For 2nd edition the .sis package does not even include the locationrequestor.py script and it complains that these constant definitions are missing. This would be a great library and I would want to start using it. Has someone contacted the developers to get this fixed? Should be simple since it just seems that no one has tested these packages before releasing them.

- Teemu

[tsharju]

Let me know if there still are problems (lost my confidence now ...)

Hi again. I tried now again and it seems to work just fine on the 2nd edition. Thanks... this is a very useful module.

[mwibbels]

Phew Thanks for the feedback!

Hi again. I tried now again and it seems to work just fine on the 2nd edition. Thanks... this is a very useful module.

[gagravarr]

This module looks really cool, I'm looking forward to having a play with it

One question though - is it possible to get the details on the satellites (position in the sky, signal strength, satellite id etc)? I see there's a way to call up the signal strength dialogue, and that a fix might have the numbers in view + used, but nothing programatic to get the full details.

(I'm looking at doing a LocationRequestor version of a python bluetooth app I've written, which currently talks to bluetooth nmea devices. The satellite details are all that's missing)

Nick

[dpeddi]

mwibbels, I think the file "Location Aquisition API.doc" you used as your reference, seems to be outdated, since it lacks detail about extended location tuple.

[...] the Location Acquisition API is also able to return extended information (such as speed) and also technology specific data (e.g. satellite data).[...]

GetSatelliteData()

TPositionSatelliteInfo gives physical information about the GPS network services used by the positioning device. This is a list of the visible and used GPS satellites, their properties and common satellite information. The satellites are described by TSatelliteData.

As http://forum.nokia.com/main/resource..._services.html Location Acquisition API (updated) say, it seems that satellite details is implemented by API but not yet by python module.

Eddi

[mwibbels]

dpeddi: You're quoting the SDK docs, whereas the "Location Aquisition API.doc" (my spelling mistake, btw) describes the Python interface. That interface did not include satellite data.

gagravarr: the satellite data was not accessbile through Python simply because we did not need it, it is however available through the Symbian API. I now added a method GetSatelliteData() which allows access to that data. The new version will appear on the official site (mentioned in the original post) shortly, in the mean-time you can find it here.

Is this what you meant?

Martin

mwibbels, I think the file "Location Aquisition API.doc" you used as your reference, seems to be outdated, since it lacks detail about extended location tuple.

[...] the Location Acquisition API is also able to return extended information (such as speed) and also technology specific data (e.g. satellite data).[...]

GetSatelliteData()

TPositionSatelliteInfo gives physical information about the GPS network services used by the positioning device. This is a list of the visible and used GPS satellites, their properties and common satellite information. The satellites are described by TSatelliteData.

As http://forum.nokia.com/main/resource..._services.html Location Acquisition API (updated) say, it seems that satellite details is implemented by API but not yet by python module.

Eddi

[gagravarr]

gagravarr: the satellite data was not accessbile through Python simply because we did not need it, it is however available through the Symbian API. I now added a method GetSatelliteData() which allows access to that data.

Thanks, that looks exactly like the data I was after

I'll try doing a LocationRequestor version of my code tonight, and will report back how I get on.

Cheers
Nick

[gagravarr]

I'll try doing a LocationRequestor version of my code tonight, and will report back how I get on.

The module worked like a charm

If anyone's interested, my python gps viewer (which previously only worked with nmea bluetooth gps's) will now use LocationRequestor if present, and works quite happily with the internal GPS in my N95
http://gagravarr.org/code/#nmea_info

Nick

[sarathgopalr]

iam a beginner in pys60.will location requestor work in emulator???

[janimr]

I haven't tested this module, but you can simulate location at least with SDK examples.
See "Simulation PSY User’s Guide" from 3rd Ed SDK help.

- janimr

[dpeddi]

Hi mwibbels,

I found your module works with PyS60 1.4.0 too (by rebuild it).
If you want to use it without rebuild PyS60 you have to adjust capabilities of PyS60 with the same you have for LocationRequestor using ensymble.

However, using nmea_info I found a bug on LocationRequestor:

While LBSReferenceApp.cpp

const TReal SpeedRatio = 36.0/10.0;

    if ( !Math::IsNaN(speedAccuracy) )
        {
        // Convert to km/h
        speedAccuracy = speedAccuracy * SpeedRatio;
        }

locationrequestor.cpp

TReal32 CLocationRequestor::toKmPerHour(TReal32 mPerS)
{
    if ( !Math::IsNaN(STATIC_CAST(TReal64,mPerS)) )
    {
        // Convert to km/h
        mPerS = (mPerS * 10) / 36;				WRONG
    }
    return mPerS;
}

While it should be

TReal32 CLocationRequestor::toKmPerHour(TReal32 mPerS)
{
    if ( !Math::IsNaN(STATIC_CAST(TReal64,mPerS)) )
    {
        // Convert to km/h
        mPerS = (mPerS * 36) / 10;
    }
    return mPerS;
}

If you want you can get this: http://usa.dpeddi.com/locationreques...d_unsigned.sis (build against python 1.4)

Best Regards,

Eddi