[swift] Sending ground elevation

src/Network/Swift/service.cpp

@@ -68,6 +68,7 @@ CService::CService()
     gearDeployRatioNode = fgGetNode("/gear/gear/position-norm");
     speedBrakeDeployRatioNode = fgGetNode("/surface-positions/speedbrake-pos-norm");
     aircraftNameNode = fgGetNode("/sim/aircraft");
+    groundElevation = fgGetNode("/position/ground-elev-m");
 
     SG_LOG(SG_NETWORK, SG_INFO, "FGSwiftBus Service initialized");
 }
@@ -298,6 +299,11 @@ double CService::getSpeedBrakeRatio() const
 	return speedBrakeDeployRatioNode->getFloatValue();
 }
 
+double CService::getGroundElevation() const
+{
+    return groundElevation->getDoubleValue();
+}
+
 std::string CService::getAircraftModelFilename() const
 {
     std::string modelFileName = getAircraftName();
@@ -482,6 +488,10 @@ DBusHandlerResult CService::dbusMessageHandler(const CDBusMessage& message_)
             queueDBusCall([=]() {
                 sendDBusReply(sender, serial, getPressAlt());
             });
+        } else if (message.getMethodName() == "getGroundElevation") {
+            queueDBusCall([=]() {
+                sendDBusReply(sender, serial, getGroundElevation());
+            });
         } else if (message.getMethodName() == "setCom1ActiveKhz") {
             maybeSendEmptyDBusReply(wantsReply, sender, serial);
             int frequency = 0;

src/Network/Swift/service.h

@@ -193,6 +193,9 @@ public:
     //! Get the ratio how much the speedbrakes surfaces are extended (0.0 is fully retracted, and 1.0 is fully extended)
     double getSpeedBrakeRatio() const;
 
+    //! Get ground elevation at aircraft current position
+    double getGroundElevation() const;
+
     //! Perform generic processing
     int process();
 
@@ -233,6 +236,7 @@ private:
     SGPropertyNode* flapsDeployRatioNode;
     SGPropertyNode* gearDeployRatioNode;
     SGPropertyNode* speedBrakeDeployRatioNode;
+    SGPropertyNode* groundElevation;
     //SGPropertyNode* numberEnginesNode;
     //SGPropertyNode* engineN1PercentageNode;
     SGPropertyNode* aircraftNameNode;