intermediate: config handler implementation

lib/config/GWConfig.h

@@ -0,0 +1,75 @@
+#ifndef _GWCONFIG_H
+#define _GWCONFIG_H
+#include <Arduino.h>
+#include <Preferences.h>
+
+class ConfigItem{
+    private:
+        String name;
+        String initialValue;
+        String value;
+    public:
+        ConfigItem(const String &name, const String initialValue){
+            this->name=name;
+            this->initialValue=initialValue;
+            this->value=initialValue;
+        }
+        ConfigItem(const String &name, bool initalValue):
+            ConfigItem(name,initalValue?String("true"):String("false")){};
+        String asString() const{
+            return value;
+        }
+        virtual void fromString(const String v){
+            value=v;
+        };
+        bool asBoolean() const{
+            return strcasecmp(value.c_str(),"true") == 0;
+        }
+        String getName() const{
+            return name;
+        }
+        virtual void reset(){
+            value=initialValue;
+        }
+        bool changed() const{
+            return value != initialValue;
+        }
+        String getDefault() const {
+            return initialValue;
+        }
+};
+
+
+class ConfigHandler{
+    private:
+        Preferences prefs;
+    public:
+        public:
+        const String sendUsb="sendUsb";
+        const String receiveUsb="receiveUsb";
+        const String wifiClient="wifiClient";
+        const String wifiPass="wifiPass";
+        const String wifiSSID="wifiSSID";
+        ConfigHandler();
+        bool loadConfig();
+        bool saveConfig();
+        bool updateValue(const char *name, const char * value);
+        bool reset(bool save);
+        String toString() const;
+        String toJson() const;
+        String getString(const String name);
+        bool getBool(const String name);
+        ConfigItem * findConfig(const String name, bool dummy=false);
+    private:
+    ConfigItem* configs[5]={
+        new ConfigItem(sendUsb,true),
+        new ConfigItem (receiveUsb,false),
+        new ConfigItem (wifiClient,false),
+        new ConfigItem (wifiSSID,""),
+        new ConfigItem (wifiPass,"")
+    };  
+    int getNumConfig() const{
+        return sizeof(configs)/sizeof(ConfigItem*);
+    }  
+};
+#endif