Add minDelta API and a bunch of overloaded not clashing calls

Author: facchinm

Diff for: src/ArduinoCloudV2.h

@@ -26,8 +26,16 @@ class ArduinoCloudClass {
 
   #define addProperty( v, ...) addPropertyReal(v, #v, __VA_ARGS__)
 
-  template<typename T> void addPropertyReal(T& property, String name, permissionType _permission = READWRITE, long seconds = ON_CHANGE, void(*fn)(void) = NULL) {
-    Thing.addPropertyReal(property, name).publishEvery(seconds).setPermission(_permission).onUpdate(fn);
+  template<typename T> void addPropertyReal(T& property, String name, permissionType _permission = READWRITE, long seconds = ON_CHANGE, T minDelta = 0, void(*fn)(void) = NULL) {
+    Thing.addPropertyReal(property, name).publishEvery(seconds).setPermission(_permission).onUpdate(fn).minimumDelta(&minDelta);
+  }
+
+  template<typename T> void addPropertyReal(T& property, String name, permissionType _permission = READWRITE, long seconds = ON_CHANGE, void(*fn)(void) = NULL, T minDelta = 0) {
+    Thing.addPropertyReal(property, name).publishEvery(seconds).setPermission(_permission).onUpdate(fn).minimumDelta(&minDelta);
+  }
+
+  template<typename T> void addPropertyReal(T& property, String name, permissionType _permission = READWRITE, void(*fn)(void) = NULL, long seconds = ON_CHANGE, T minDelta = 0) {
+    Thing.addPropertyReal(property, name).publishEvery(seconds).setPermission(_permission).onUpdate(fn).minimumDelta(&minDelta);
   }
 
 protected: