Some minor network context upfront fixes discovered:

* readAtcBookingsFromSource() const; to non const, it changes data in the context
* better adjusting of update time for bookings
* No updates if URL is empty, checked.

src/blackcore/context_network.cpp

@@ -38,7 +38,7 @@ namespace BlackCore
         this->m_atcBookingTimer = new QTimer(this);
         this->connect(this->m_networkManager, &QNetworkAccessManager::finished, this, &CContextNetwork::psAtcBookingsRead);
         this->connect(this->m_atcBookingTimer, &QTimer::timeout, this, &CContextNetwork::readAtcBookingsFromSource);
-        this->m_atcBookingTimer->start(15 * 1000);
+        this->m_atcBookingTimer->start(10 * 1000); // will be reset in method to a longer time
 
         // 4. connect signals and slots
         this->connect(this->m_network, &INetwork::connectionStatusChanged, this, &CContextNetwork::psFsdConnectionStatusChanged);

src/blackcore/context_network.h

@@ -72,7 +72,7 @@ namespace BlackCore
         /*!
          * \copydoc IContextNetwork::readAtcBookingsFromSource()
          */
-        virtual void readAtcBookingsFromSource() const;
+        virtual void readAtcBookingsFromSource();
 
         /*!
          * \copydoc IContextNetwork::getAtcStationsOnline()

src/blackcore/context_network_atc.cpp

@@ -28,9 +28,14 @@ namespace BlackCore
     /*
      * Read bookings
      */
-    void CContextNetwork::readAtcBookingsFromSource() const
+    void CContextNetwork::readAtcBookingsFromSource()
     {
+        const int updateTime = 60 * 1000; // 1min
+        if (!(this->m_atcBookingTimer->interval() == updateTime)) this->m_atcBookingTimer->setInterval(updateTime); // 1min
+
         QUrl url(this->getNetworkSettings().getBookingServiceUrl());
+        if (url.isEmpty()) return;
+
         QNetworkRequest request(url);
         this->m_networkManager->get(request);
     }

src/blackcore/context_network_interface.cpp

@@ -61,7 +61,7 @@ namespace BlackCore
             qDebug() << "   LOG: " << method << m1 << m2 << m3 << m4;
     }
 
-    void IContextNetwork::readAtcBookingsFromSource() const
+    void IContextNetwork::readAtcBookingsFromSource()
     {
         this->m_dBusInterface->callDBus(QLatin1Literal("readAtcBookingsFromSource"));
     }

src/blackcore/context_network_interface.h

@@ -158,7 +158,7 @@ namespace BlackCore
          * \brief Read ATC bookings
          * \return
          */
-        virtual void readAtcBookingsFromSource() const;
+        virtual void readAtcBookingsFromSource();
 
         /*!
          * \brief The ATC list with online ATC controllers