Checks to avoid issues during the XPlane startup.

Those here are precautionary.

src/xswiftbus/main.cpp

@@ -24,7 +24,7 @@ static XSwiftBus::CPlugin *g_plugin = nullptr;
 
 PLUGIN_API int XPluginStart(char *o_name, char *o_sig, char *o_desc)
 {
-#if APL
+#ifdef APL
     // https://developer.x-plane.com/2014/12/mac-plugin-developers-you-should-be-using-native-paths/
     XPLMEnableFeature("XPLM_USE_NATIVE_PATHS", 1);
 #endif
@@ -58,6 +58,12 @@ PLUGIN_API void XPluginReceiveMessage(XPLMPluginID from, long msg, void *param)
 {
     if (from == XPLM_PLUGIN_XPLANE)
     {
+        if (!g_plugin || !g_plugin->isRunning())
+        {
+            WARNING_LOG("Received message, but plugin NOT running");
+            return;
+        }
+
         switch (msg)
         {
         case XPLM_MSG_PLANE_LOADED:

src/xswiftbus/plugin.cpp

@@ -85,7 +85,7 @@ namespace XSwiftBus
     void CPlugin::readConfig()
     {
         initXPlanePath();
-        auto configFilePath = g_xplanePath + "Resources" + g_sep + "plugins" + g_sep + "xswiftbus" + g_sep + "xswiftbus.conf";
+        const std::string configFilePath = g_xplanePath + "Resources" + g_sep + "plugins" + g_sep + "xswiftbus" + g_sep + "xswiftbus.conf";
         m_pluginConfig.setFilePath(configFilePath);
         m_pluginConfig.parse();
         m_pluginConfig.print();
@@ -179,6 +179,7 @@ namespace XSwiftBus
         {
             plugin->startServer();
             plugin->m_isRunning = true;
+            INFO_LOG("XSwiftBus plugin started (deferred)");
         }
         return 0;
     }

src/xswiftbus/plugin.h

@@ -56,6 +56,12 @@ namespace XSwiftBus
         //! Called by XPluginReceiveMessage when the aircraft is positioned at an airport
         void onAircraftRepositioned();
 
+        //! Is running
+        bool isRunning() const { return m_isRunning; }
+
+        //! Should stop
+        bool shouldStop() const { return m_shouldStop; }
+
     private:
         CConfig         m_pluginConfig;
         CDBusDispatcher m_dbusDispatcher;

src/xswiftbus/service.cpp

@@ -14,6 +14,7 @@
 #include <XPLM/XPLMPlanes.h>
 #include <XPLM/XPLMUtilities.h>
 
+#include <cstring>
 #include <algorithm>
 
 // clazy:excludeall=reserve-candidates
@@ -33,7 +34,12 @@ namespace XSwiftBus
         char filename[256];
         char path[512];
         XPLMGetNthAircraftModel(XPLM_USER_AIRCRAFT, filename, path);
-        AcfProperties acfProperties = extractAcfProperties(path);
+        if (std::strlen(filename) < 1 || std::strlen(path) < 1)
+        {
+            WARNING_LOG("Aircraft changed, but NO path or file name");
+            return;
+        }
+        const AcfProperties acfProperties = extractAcfProperties(path);
         emitAircraftModelChanged(path, filename, getAircraftLivery(), getAircraftIcaoCode(), acfProperties.modelString, acfProperties.modelName, getAircraftDescription());
     }