Removing writeStdout/writeProperties/writeShadowOut from being pure virtual functions within the ArduinoIoTCloud base class

There is no need for this since the communication mechanism is different for TCP enabled and LoRa based boards.
Removing of both writeStdout and writeShadowOut since they are not required for LoRa boards (there isn't even MQTT in play)

Author: aentinger

src/ArduinoIoTCloud.h

@@ -128,10 +128,6 @@ class ArduinoIoTCloudClass
 
   protected:
 
-    virtual int writeStdout(const byte data[], int length) = 0;
-    virtual int writeProperties(const byte data[], int length) = 0;
-    virtual int writeShadowOut(const byte data[], int length) = 0;
-
     inline ArduinoIoTConnectionStatus getIoTStatus() { return _iotStatus; }
 
     String _device_id = "";

src/ArduinoIoTCloudLPWAN.cpp

@@ -180,29 +180,6 @@ int ArduinoIoTCloudLPWAN::writeProperties(const byte data[], int length) {
   return 1;
 }
 
-int ArduinoIoTCloudLPWAN::writeStdout(const byte data[], int length) {
-  int retcode = _connection->write(data, length);
-  int i = 0;
-  while (_retryEnable && retcode < 0 && i < _maxNumRetry) {
-    delay(_intervalRetry);
-    retcode = _connection->write(data, length);
-    i++;
-  }
-
-  return 1;
-}
-
-int ArduinoIoTCloudLPWAN::writeShadowOut(const byte data[], int length) {
-  int retcode = _connection->write(data, length);
-  int i = 0;
-  while (_retryEnable && retcode < 0 && i < _maxNumRetry) {
-    delay(_intervalRetry);
-    retcode = _connection->write(data, length);
-    i++;
-  }
-  return 1;
-}
-
 /******************************************************************************
  * PRIVATE MEMBER FUNCTIONS
  ******************************************************************************/

src/ArduinoIoTCloudLPWAN.h

@@ -74,9 +74,7 @@ class ArduinoIoTCloudLPWAN : public ArduinoIoTCloudClass {
     }
 
   protected:
-    int writeStdout(const byte data[], int length);
     int writeProperties(const byte data[], int length);
-    int writeShadowOut(const byte data[], int length);
 
   private:
     ConnectionHandler* _connection;