src/MeasurementComplexItem/MeasurementComplexItem.cc

@@ -41,6 +41,7 @@ const char *variantNamesKey = "VariantNames";
 const char *generatorArrayKey = "GeneratorArray";
 const char *variantArrayKey = "VariantArray";
 const char *generatorIndexKey = "GeneratorIndex";
+const char *connectionsStringKey = "ConnectionString";
 } // namespace
 
 MeasurementComplexItem::MeasurementComplexItem(
@@ -55,7 +56,8 @@ MeasurementComplexItem::MeasurementComplexItem(
       _variantIndex(settingsGroup, _metaDataMap[variantIndexKey]),
       _pAreaData(new AreaData(this)), _pEditorData(new AreaData(this)),
       _pCurrentData(_pAreaData), _holdProgress(false), _pGenerator(nullptr),
-      _pWorker(new RoutingThread(this)) {
+      _pWorker(new RoutingThread(this)),
+      _nemoCString(settingsGroup, _metaDataMap[connectionsStringKey]) {
 
   // Setup altitude.
   _altitude.setRawValue(qgcApp()
@@ -91,17 +93,17 @@ MeasurementComplexItem::MeasurementComplexItem(
           &MeasurementComplexItem::_storeRoutingData);
 
   // Connect coordinate and exitCoordinate.
-  connect(this, &MeasurementComplexItem::routeChanged,
+  connect(this, &MeasurementComplexItem::routeChanged, this,
           [this] { emit this->coordinateChanged(this->coordinate()); });
-  connect(this, &MeasurementComplexItem::routeChanged,
+  connect(this, &MeasurementComplexItem::routeChanged, this,
           [this] { emit this->exitCoordinateChanged(this->exitCoordinate()); });
-  connect(this, &MeasurementComplexItem::routeChanged, [this] {
+  connect(this, &MeasurementComplexItem::routeChanged, this, [this] {
     emit this->exitCoordinateSameAsEntryChanged(
         this->exitCoordinateSameAsEntry());
   });
 
   // Connect isIncomplete.
-  connect(this, &MeasurementComplexItem::idleChanged, [this] {
+  connect(this, &MeasurementComplexItem::idleChanged, this, [this] {
     if (this->idle()) {
       if (this->route().size() > 0 && this->_isIncomplete == true) {
         this->_isIncomplete = false;
@@ -124,14 +126,14 @@ MeasurementComplexItem::MeasurementComplexItem(
           &MeasurementComplexItem::_updateFlightpathSegments);
 
   // Connect complexDistance.
-  connect(this, &MeasurementComplexItem::routeChanged,
+  connect(this, &MeasurementComplexItem::routeChanged, this,
           [this] { emit this->complexDistanceChanged(); });
 
   resetGenerators();
   startEditing();
 
   // connect to nemo interface
-  connect(pNemoInterface, &NemoInterface::progressChanged, this,
+  connect(pNemoInterface, &Nemointerface::progressChanged, this,
           &MeasurementComplexItem::_onNewProgress);
 }
 
@@ -773,6 +775,17 @@ void MeasurementComplexItem::_onAltitudeChanged() {
   }
 }
 
+QString MeasurementComplexItem::nemoError() const { return _nemoError; }
+
+void MeasurementComplexItem::_setNemoError(const QString &nemoError) {
+  if (_nemoError != nemoError) {
+    _nemoError = nemoError;
+    emit nemoErrorChanged();
+  }
+}
+
+Fact *MeasurementComplexItem::nemoCString() { return &_nemoCString; }
+
 bool MeasurementComplexItem::holdProgress() const { return _holdProgress; }
 
 void MeasurementComplexItem::setHoldProgress(bool holdProgress) {
@@ -781,10 +794,10 @@ void MeasurementComplexItem::setHoldProgress(bool holdProgress) {
     emit holdProgressChanged();
 
     if (_holdProgress) {
-      disconnect(pNemoInterface, &NemoInterface::progressChanged, this,
+      disconnect(pNemoInterface, &Nemointerface::progressChanged, this,
                  &MeasurementComplexItem::_onNewProgress);
     } else {
-      connect(pNemoInterface, &NemoInterface::progressChanged, this,
+      connect(pNemoInterface, &Nemointerface::progressChanged, this,
               &MeasurementComplexItem::_onNewProgress);
       _onNewProgress(pNemoInterface->getProgress());
     }

src/MeasurementComplexItem/MeasurementComplexItem.h

@@ -14,6 +14,7 @@
 
 class RoutingThread;
 class RoutingResult;
+class Nemointerface;
 
 namespace routing {
 class GeneratorBase;
@@ -51,6 +52,8 @@ public:
   Q_PROPERTY(int generatorIndex READ generatorIndex NOTIFY generatorChanged)
   Q_PROPERTY(AreaData *areaData READ areaData NOTIFY areaDataChanged)
   Q_PROPERTY(QVariantList route READ route NOTIFY routeChanged)
+  Q_PROPERTY(QString nemoError READ nemoError NOTIFY nemoErrorChanged)
+  Q_PROPERTY(Fact *nemoCString READ nemoCString CONSTANT)
 
   Q_INVOKABLE void reverseRoute(void);
 
@@ -224,6 +227,10 @@ public:
   bool holdProgress() const;
   void setHoldProgress(bool holdProgress);
 
+  QString nemoError() const;
+
+  Fact *nemoCString();
+
 signals:
   void variantNamesChanged();
 
@@ -238,6 +245,8 @@ signals:
   void routeChanged();
   void holdProgressChanged();
 
+  void nemoErrorChanged();
+
 private slots:
 
   // Worker functions.
@@ -257,6 +266,7 @@ private:
   static bool _idle(STATE state);
   void _updateFlightpathSegments();
   void _onAltitudeChanged();
+  void _setNemoError(const QString &nemoError);
 
   // Hirarcical stuff.
   int _sequenceNumber;
@@ -285,4 +295,9 @@ private:
   QVector<Variant> _variantVector;
   Variant _route;
   PtrWorker _pWorker;
+
+  // NemoInterface
+  std::shared_ptr<Nemointerface> _pNemointerface;
+  QString _nemoError;
+  SettingsFact _nemoCString;
 };

src/MeasurementComplexItem/NemoInterface.h

@@ -13,20 +13,20 @@
 #include "TilePtrArray.h"
 #include "geometry/ProgressArray.h"
 
-// Singelton class used to interface measurement devices implementing the nemo
-// interface.
-class NemoInterface : public QObject {
+class NemointerfaceFactory;
+
+class Nemointerface : public QObject {
   Q_OBJECT
   class Impl;
   using PImpl = std::unique_ptr<Impl>;
 
-  NemoInterface();
-  NemoInterface(NemoInterface &other) = delete;
-  static NemoInterface *createInstance();
+  Nemointerface(const QString &connectionString);
+  Nemointerface(Nemointerface &other) = delete;
+
+  friend class NemointerfaceFactory;
 
 public:
-  ~NemoInterface() override;
-  static NemoInterface *instance();
+  ~Nemointerface() override;
 
   enum class STATUS {
     NOT_CONNECTED,
@@ -90,6 +90,7 @@ public:
   QString infoString() const;
   QString warningString() const;
   bool running() const;
+  QString connectionString();
 
 signals:
   void statusChanged();
@@ -103,4 +104,25 @@ private:
   PImpl pImpl;
 };
 
-#define pNemoInterface NemoInterface::instance()
+// Singelton class used for nemo interface creation.
+class NemointerfaceFactory {
+  NemointerfaceFactory();
+  NemointerfaceFactory(const NemointerfaceFactory &other) = delete;
+  static NemointerfaceFactory *createInstance();
+
+public:
+  ~NemointerfaceFactory();
+  static NemointerfaceFactory *instance();
+
+  // Creates a interface with a connection string connectionString.
+  // Two different interfaces can't share the same connection string.
+  std::shared_ptr<Nemointerface> create(const QString &connectionString);
+  // Returns true if an interface with connection string connectionString can
+  // be created (i.e. doesn't exist yet), returns false either.
+  bool isCreatable(const QString &connectionString);
+
+private:
+  std::map<QString, std::weak_ptr<Nemointerface>> _map;
+};
+
+#define pNemoInterfaceFactory NemointerfaceFactory::instance()

src/MeasurementComplexItem/geometry/MeasurementArea.cc

@@ -19,7 +19,7 @@
 #define MAX_TILES 1000
 #endif
 
-QString randomId();
+QString randomId(std::size_t length = 10);
 
 using namespace geometry;
 namespace trans = bg::strategy::transform;
@@ -726,13 +726,24 @@ bool getTiles(const FPolygon &area, Length tileHeight, Length tileWidth,
   return true;
 }
 
-QString randomId() {
-  std::srand(std::time(nullptr));
-  std::int64_t r = 0;
-
-  for (int i = 0; i < 10; ++i) {
-    r ^= std::rand();
+QString randomId(std::size_t length) {
+  static const QString values(
+      "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789");
+  static std::uint64_t counter = 0;
+  static auto firstCall = std::chrono::high_resolution_clock::now();
+
+  auto delta = std::chrono::duration_cast<std::chrono::nanoseconds>(
+                   std::chrono::high_resolution_clock::now() - firstCall)
+                   .count();
+
+  std::srand((unsigned int)delta ^ counter);
+  QString str;
+  for (int i = 0; i < length; ++i) {
+    int index = std::rand() % values.length();
+    QChar c = values.at(index);
+    str.append(c);
   }
 
-  return QString::number(r);
+  ++counter;
+  return str;
 }

src/MeasurementComplexItem/json/MeasurementComplexItem.SettingsGroup.json

@@ -17,6 +17,13 @@
     "min":              1,
     "decimalPlaces":    1,
     "default":     10.0
+},
+{
+    "name":             "ConnectionString",
+    "shrotDesc": "Nemo Connection String.",
+    "longDesc":  "Nemo Connection String (e.g. host_ip:port).",
+    "type":             "string",
+    "default":     "localhost:9090"
 }
 ]
 }

src/QGCApplication.cc

@@ -672,7 +672,7 @@ void QGCApplication::_initCommon() {
   qmlRegisterUncreatableType<routing::LinearGenerator>(
       "MeasurementComplexItem", 1, 0, "LinearGenerator", kRefOnly);
   qmlRegisterType<AreaData>("MeasurementComplexItem", 1, 0, "AreaData");
-  qmlRegisterSingletonType<NemoInterface>("MeasurementComplexItem", 1, 0,
+  qmlRegisterSingletonType<Nemointerface>("MeasurementComplexItem", 1, 0,
                                           "NemoInterface", getNemoInterface);
   qmlRegisterInterface<routing::GeneratorBase>("GeneratorBase");
   qmlRegisterUncreatableType<routing::CircularGenerator>(