use malloc/free for WiFiManagerParameter* array instead of hard coding.

WiFiManager.cpp

@@ -60,22 +60,42 @@ const char* WiFiManagerParameter::getCustomHTML() {
   return _customHTML;
 }
 
+
 WiFiManager::WiFiManager() {
+    _max_params = WIFI_MANAGER_MAX_PARAMS;
+    _params = (WiFiManagerParameter**)malloc(_max_params * sizeof(WiFiManagerParameter*));
 }
 
-void WiFiManager::addParameter(WiFiManagerParameter *p) {
-  if(_paramsCount + 1 > WIFI_MANAGER_MAX_PARAMS)
+WiFiManager::~WiFiManager()
+{
+    if (_params != NULL)
+    {
+        DEBUG_WM(F("freeing allocated params!"));
+        free(_params);
+    }
+}
+
+bool WiFiManager::addParameter(WiFiManagerParameter *p) {
+  if(_paramsCount + 1 > _max_params)
   {
-    //Max parameters exceeded!
-	DEBUG_WM("WIFI_MANAGER_MAX_PARAMS exceeded, increase number (in WiFiManager.h) before adding more parameters!");
-	DEBUG_WM("Skipping parameter with ID:");
-	DEBUG_WM(p->getID());
-	return;
+    // rezise the params array
+    _max_params += WIFI_MANAGER_MAX_PARAMS;
+    DEBUG_WM(F("Increasing _max_params to:"));
+    DEBUG_WM(_max_params);
+    WiFiManagerParameter** new_params = (WiFiManagerParameter**)realloc(_params, _max_params * sizeof(WiFiManagerParameter*));
+    if (new_params != NULL) {
+      _params = new_params;
+    } else {
+      DEBUG_WM("ERROR: failed to realloc params, size not increased!");
+      return false;
+    }
   }
+
   _params[_paramsCount] = p;
   _paramsCount++;
   DEBUG_WM("Adding parameter");
   DEBUG_WM(p->getID());
+  return true;
 }
 
 void WiFiManager::setupConfigPortal() {

WiFiManager.h

@@ -65,6 +65,7 @@ class WiFiManager
 {
   public:
     WiFiManager();
+    ~WiFiManager();
 
     boolean       autoConnect();
     boolean       autoConnect(char const *apName, char const *apPassword = NULL);
@@ -99,8 +100,8 @@ class WiFiManager
     void          setAPCallback( void (*func)(WiFiManager*) );
     //called when settings have been changed and connection was successful
     void          setSaveConfigCallback( void (*func)(void) );
-    //adds a custom parameter
-    void          addParameter(WiFiManagerParameter *p);
+    //adds a custom parameter, returns false on failure
+    bool          addParameter(WiFiManagerParameter *p);
     //if this is set, it will exit after config, even if connection is unsuccessful.
     void          setBreakAfterConfig(boolean shouldBreak);
     //if this is set, try WPS setup when starting (this will delay config portal for up to 2 mins)
@@ -176,7 +177,8 @@ class WiFiManager
     void (*_apcallback)(WiFiManager*) = NULL;
     void (*_savecallback)(void) = NULL;
 
-    WiFiManagerParameter* _params[WIFI_MANAGER_MAX_PARAMS];
+    int                    _max_params;
+    WiFiManagerParameter** _params;
 
     template <typename Generic>
     void          DEBUG_WM(Generic text);