[Positioning] Add option update-ap-coordinates-online

In InputUDPSocket, update the AP's coordinates when receiving a
calibration or autocalibration request that contains the coordinates.
This is done if the option positioning.update-ap-coordinates-online is
activated.

owlps-positioning/cfg/owlps-positioning.cfg

@@ -59,6 +59,12 @@ csv-file = /tmp/owlps-positioning.log
 # request is compared directly to each calibration request.
 #radar-average-reference-points = false
 
+# When receiving a calibration or autocalibration request from an AP,
+# containing the transmiter's coordinates, memorise the new AP's
+# coordinates.
+# This is unactivated by default for the sake of security.
+#update-ap-coordinates-online = false
+
 [output]
 
 # This is the default output if none is specified.

owlps-positioning/src/inputudpsocket.cc

@@ -1,6 +1,7 @@
 #include "inputudpsocket.hh"
 #include "posexcept.hh"
 #include "stock.hh"
+#include "configuration.hh"
 
 #include <owlps.h>
 
@@ -158,6 +159,14 @@ const Request& InputUDPSocket::get_next_request()
       if (request.type == OWL_REQUEST_AUTOCALIBRATION && ! position)
         position = transmitter.get_coordinates() ;
 
+      // Update the AP's coordinates if allowed. A 'false' position
+      // (i.e. 0;0;0) is only set for calibration requests, to avoid
+      // setting the coordinates to 0;0;0 if an autocalibration
+      // request that does not contain the coordinates is received.
+      else if (Configuration::
+               bool_value("positioning.update-ap-coordinates-online"))
+        transmitter.set_coordinates(position) ;
+
       const ReferencePoint &reference_point =
         Stock::find_create_reference_point(position) ;
       current_request_to_calibration_request(&reference_point,

owlps-positioning/src/userinterface.cc

@@ -186,6 +186,11 @@ void UserInterface::fill_positioning_options()
    " before to compute the SS distance."
    " The default is false, i.e the positioning request is compared"
    " directly to each calibration request.")
+  ("positioning.update-ap-coordinates-online",
+   po::value<bool>()->default_value(false),
+   "Allow AP's coordinates to be updated when a calibration request"
+   " with new coordinates is received from the AP (default is false,"
+   " for security purposes).")
   ;
 
   file_options->add(options) ;