Synchronously invokes the <link linkend="gdbus-method-org-freedesktop-GeoClue2-Client.
Start">Start</link> D-Bus method on this. The calling thread is blocked until a
reply is received.
See call_start for the asynchronous version of this method.
| this |
A ClientProxy. |
| cancellable |
A Cancellable or null. |
|
true if the call succeeded, false if throws is set. |