Wifi positioning backends

[Jussi Kukkonen]

Andrew Turner wrote:
> I think having at least a backend example implemented in Python is
> good for encouraging developers to create new backends. Getting up and
> running with Maemo Development isn't "easy" and can discourage some
> new developers. Similarly, I think we should have a full Python
> application example that uses the GeoClue service.

I agree completely, this is why I thought I needed to backup my
argument... Using a generic message bus is a major plus for geoclue, but
only if using geoclue with 'easier' languages/development platforms is
possible in practice also.

> Your points are valid, and so maybe also having a C version for
> default install is ok - but keeping the Python one as the
> primary/example.
> 

This turned out to be fairly easy and I was able reuse a lot of hostip
code (the functions are still copy-pasted, not #included). This is what
I currently have (omitting debug messages):

    jku at loki:~$ geoclue-position-example plazes
    You are at 60.196908 24.878229
    Country: Finland
    Locality: HELSINKI
    Postalcode: 00330
    Street: Solnantie 24
    Text: Jussi's home

    jku at loki:~$

For reference, this is what hostip outputs:

    jku at loki:~$ geoclue-position-example hostip
    You are at 60.266700 25.000000
    Country: FINLAND
    Locality: Helsinki
    Postalcode:
    Street:
    Text:

    jku at loki:~$

I'll commit over the current "backend/position_plazes/"-stub. If someone
has a problem with this, let me know and we'll solve the issue.

Btw, assigning an accuracy value to coordinates from plazes is going to
be a bit hairy too -- the accuracy of my example is somewhere around 50m
(the range of my AP + some error in my AP location) but not all APs will
have a an accurate location... maybe 100-500m is a good guestimate.

-jussi

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