Current providers recognise these options:
* org.freedesktop.Geoclue.GPSDevice
Gypsy provider will use this device name
(e.g. "00:02:76:C5:81:BF" or "/dev/pgps")
* org.freedesktop.Geoclue.GPSHost
Gpsd provider will contact gpsd on this host.
Default is NULL (localhost)
* org.freedesktop.Geoclue.GPSPort
Gpsd provider will contact gpsd on this port.
Default is "2947".
Provider options can be set with SetOptions-method. Geoclue-master
reads options from gconf (/apps/geoclue/master): as an example, the
Gypsy device for geoclue master can be set with
gconftool-2 \
-t string \
-s /apps/geoclue/master/org.freedesktop.Geoclue.GPSDevice 00:02:76:C5:81:BF