fix travis build

Author: abratchik

src/app_component.cpp

@@ -25,7 +25,7 @@ void CLAppComponent::dumpPrefs() {
     Serial.println(s);
 }
 
-int CLAppComponent::readJsonIntVal(jparse_ctx_t *jctx_ptr, const char* token) {
+int CLAppComponent::readJsonIntVal(jparse_ctx_t *jctx_ptr, char* token) {
   int res=0;
   if(json_obj_get_int(jctx_ptr, token, &res) == OS_SUCCESS)
     return res;

src/app_component.h

@@ -11,9 +11,9 @@ class CLAppComponent {
     public:
     // Sketch Info
 
-        int start(){};
-        int loadPrefs(){};
-        int savePrefs(){};
+        int start(){return OS_SUCCESS;};
+        int loadPrefs(){return OS_SUCCESS;};
+        int savePrefs(){return OS_SUCCESS;};
 
         void dumpPrefs();
         void removePrefs();
@@ -24,19 +24,19 @@ class CLAppComponent {
         bool isDebugMode(){return debug_mode;};
 
     protected:
-        void setTag(char *t) {tag = t;};
+        void setTag(const char *t) {tag = t;};
 
         /// @brief reads the Int value from JSON context by token. 
         /// @param jctx_ptr JSON context pointer
         /// @param token 
         /// @return value, or 0 if fail
-        int readJsonIntVal(jparse_ctx_t *jctx, const char* token);
+        int readJsonIntVal(jparse_ctx_t *jctx, char* token);
 
         int parsePrefs(jparse_ctx_t *jctx);
 
 
     private:
-        char * tag;
+        const char * tag;
 
         bool debug_mode = false;