Adding virtual/override keywords and missing ctors where necessary

Author: aentinger

src/ArduinoIoTCloud.h

@@ -77,10 +77,13 @@ class ArduinoIoTCloudClass
 {
   public:
 
+    virtual ~ArduinoIoTCloudClass() { }
+
+
     virtual int  connect       () = 0;
     virtual bool disconnect    () = 0;
     virtual void update        () = 0;
-    virtual int connected      () = 0;
+    virtual int  connected     () = 0;
     virtual void printDebugInfo() = 0;
 
     inline void     setThingId (String const thing_id)  { _thing_id = thing_id; };

src/ArduinoIoTCloudLPWAN.cpp

@@ -37,9 +37,6 @@
 ArduinoIoTCloudLPWAN::ArduinoIoTCloudLPWAN() :
   _connection(NULL) {}
 
-ArduinoIoTCloudLPWAN::~ArduinoIoTCloudLPWAN() {
-}
-
 /******************************************************************************
  * PUBLIC MEMBER FUNCTIONS
  ******************************************************************************/

src/ArduinoIoTCloudLPWAN.h

@@ -37,14 +37,17 @@ static uint8_t const DEFAULT_CBOR_LORA_MSG_SIZE = 255;
 
 class ArduinoIoTCloudLPWAN : public ArduinoIoTCloudClass {
   public:
-    ArduinoIoTCloudLPWAN();
-    ~ArduinoIoTCloudLPWAN();
-    int connect();
-    bool disconnect();
-    int connected();
-    void update();
+
+             ArduinoIoTCloudLPWAN();
+    virtual ~ArduinoIoTCloudLPWAN() { }
+
+    virtual int  connect       () override;
+    virtual bool disconnect    () override;
+    virtual void update        () override;
+    virtual int  connected     () override;
+    virtual void printDebugInfo() override;
+
     ArduinoIoTConnectionStatus connectionCheck();
-    void printDebugInfo();
     int begin(ConnectionHandler& connection, bool retry = false);
     inline ConnectionHandler* getConnection() {
       return _connection;

src/ArduinoIoTCloudTCP.h

@@ -52,13 +52,15 @@ class ArduinoIoTCloudTCP: public ArduinoIoTCloudClass {
 
     static const int TIMEOUT_FOR_LASTVALUES_SYNC = 10000;
 
-    ArduinoIoTCloudTCP();
-    ~ArduinoIoTCloudTCP();
-    int connect();
-    bool disconnect();
-    int connected();
-    void update();
-    void printDebugInfo();
+             ArduinoIoTCloudTCP();
+    virtual ~ArduinoIoTCloudTCP();
+
+    virtual int  connect       () override;
+    virtual bool disconnect    () override;
+    virtual void update        () override;
+    virtual int  connected     () override;
+    virtual void printDebugInfo() override;
+
     #ifdef BOARD_HAS_ECCX08
     int begin(ConnectionHandler & connection, String brokerAddress = DEFAULT_BROKER_ADDRESS_SECURE_AUTH, uint16_t brokerPort = DEFAULT_BROKER_PORT_SECURE_AUTH);
     #else