diff --git a/library.json b/library.json
index 26410ce..6ec9f81 100644
--- a/library.json
+++ b/library.json
@@ -12,7 +12,7 @@
     "type": "git",
     "url": "https://git.xpablo.cz/xPablo.cz/sysvars.git"
   },
-  "version": "0.0.3",
+  "version": "1.0.0",
   "license": "MIT",
   "frameworks": "arduino",
   "platforms": ["espressif8266", "espressif32"],
diff --git a/library.properties b/library.properties
index 7826aff..5bd1db5 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=sysvars
-version=0.0.2
+version=1.0.0
 author=Pavel Brychta
 maintainer=Pavel Brychta <pablo@xpablo.cz>
 sentence=Key-Value JSON file storage library.
diff --git a/src/definefs.hpp b/src/definefs.hpp
index e9cb4af..5acf39d 100644
--- a/src/definefs.hpp
+++ b/src/definefs.hpp
@@ -2,13 +2,13 @@
 #ifndef USEDFS
 # if defined(ESP32)
 #  ifdef USE_LITTLEFS
-#   if ESP_IDF_VERSION_MAJOR < 4
-#    include <LITTLEFS.h>
-#    define USEDFS LITTLEFS
-#   else
+//#   if ESP_IDF_VERSION_MAJOR < 4
+//#    include <LITTLEFS.h>
+//#    define USEDFS LITTLEFS
+//#   else
 #    include <LittleFS.h>
 #    define USEDFS LittleFS
-#   endif
+//#   endif
 #  else
 #   include <SPIFFS.h>
 #   define USEDFS SPIFFS
diff --git a/src/sysvars.cpp b/src/sysvars.cpp
new file mode 100644
index 0000000..a309889
--- /dev/null
+++ b/src/sysvars.cpp
@@ -0,0 +1,159 @@
+/** Sysvars library
+ * Copyright (c) 2018-2024 Pavel Brychta, pablo@xpablo.cz
+ *
+ * Key-value store/load library with JSON file using internal filesystem
+ **/
+
+#include "definefs.hpp"
+#include "sysvars.hpp"
+#include <ArduinoJson.h>
+#include <FS.h>
+#include <trace.h>
+
+#ifndef TRACE_SYSVARS
+# define TRACE_SYSVARS 0
+#endif
+
+#if not defined(SYSVAR_FILE)
+    #define SYSVAR_FILE "/cfg.json"
+#endif
+
+template <typename T>
+T svGetV(const String & name, const T deflt)
+{
+    T rv = deflt;
+
+    File f = USEDFS.open(F(SYSVAR_FILE), "r");
+    if (f) {
+        JsonDocument doc;
+        DeserializationError err = deserializeJson(doc, f);
+
+        if (err) {
+            TRACEPLUS(TRACE_SYSVARS, TRACE_ERROR, "SV: Deserialize error '%s'", err.c_str()); // wrong JSON file (malformed)
+        } else {
+            if (!doc.containsKey(name)) {
+                TRACEPLUS(TRACE_SYSVARS, TRACE_ERROR, "SV: Key '%s' not found", name.c_str());
+            } else {
+                rv = doc[name].as<T>();
+            }
+        }
+    } else {
+        TRACEPLUS(TRACE_SYSVARS, TRACE_ERROR, "SV: File not found");
+    }
+    return rv;
+}
+
+template <typename T>
+T svGetVFile(const String & name, const String & fname, const T deflt)
+{
+    T rv = deflt;
+    File f = USEDFS.open(fname, "r");
+
+    if (f) {
+        JsonDocument doc;
+        DeserializationError err = deserializeJson(doc, f);
+
+        if (err) {
+            TRACEPLUS(TRACE_SYSVARS, TRACE_ERROR, "SV: Deserialize error '%s'", err.c_str()); // wrong JSON file (malformed)
+        } else {
+            if (!doc.containsKey(name)) {
+                TRACEPLUS(TRACE_SYSVARS, TRACE_ERROR, "SV: Key '%s' not found", name.c_str());
+            } else {
+                rv = doc[name].as<T>();
+            }
+        }
+    } else {
+        TRACEPLUS(TRACE_SYSVARS, TRACE_ERROR, "SV: File not found '%s'", fname.c_str());
+    }
+    return rv;
+}
+
+/**
+ * @brief      Store value for the key
+ *
+ * @param[in]  name   Key name
+ * @param[in]  value  New value
+ *
+ * @tparam     T      Type of the value
+ *
+ * @return     Result (SV_...)
+ */
+template <typename T>
+int svSetV(const String & name, T value)
+{
+    int res;
+    JsonDocument doc;
+    File f = USEDFS.open(F(SYSVAR_FILE), "r");
+
+    if (f) {
+        DeserializationError err = deserializeJson(doc, f);
+        if (err) {
+            res = SV_DESERIALIZE_ERROR; // wrong (malformed) JSON file
+        }
+        f.close();
+    }
+    doc[name] = value;
+
+    f = USEDFS.open(SYSVAR_FILE, "w");
+    if (f) {
+        serializeJson(doc, f);
+        res = SV_OK;
+    } else {
+        res = SV_FILE_WRITE_ERROR;
+    }
+    return res;
+}
+
+/**
+ * @brief      Store value for the key
+ *
+ * @param[in]  name   Key name
+ * @param[in]  value  New value
+ * @param[in]  fname  JSON file name
+ *
+ * @tparam     T      Type of the value
+ *
+ * @return     Result (SV_...)
+ */
+template <typename T>
+int svSetVFile(const String & name, T value, const String & fname)
+{
+    int res = SV_UNSPECIFIED_ERROR;
+    JsonDocument doc;
+    File f = USEDFS.open(fname, "r");
+
+    if (f) {
+        DeserializationError err = deserializeJson(doc, f);
+        if (err) {
+            res = SV_DESERIALIZE_ERROR; // wrong (malformed) JSON file
+        }
+        f.close();
+    }
+    doc[name] = value;
+
+    f = USEDFS.open(fname, "w");
+    if (f) {
+        serializeJson(doc, f);
+        res = SV_OK;
+    } else {
+        res = SV_FILE_WRITE_ERROR;
+    }
+
+    return res;
+}
+
+template int svGetV(const String & name, const int deflt);
+template String svGetV(const String & name, const String deflt);
+template unsigned svGetV(const String & name, const unsigned deflt);
+
+template int svGetVFile(const String & name, const String & fname, const int deflt);
+template String svGetVFile(const String & name, const String & fname, const String deflt);
+template unsigned svGetVFile(const String & name, const String & fname, const unsigned deflt);
+
+template int svSetV(const String & name, int value);
+template int svSetV(const String & name, unsigned value);
+template int svSetV(const String & name, String value);
+
+template int svSetVFile(const String & name, int value, const String & fname);
+template int svSetVFile(const String & name, unsigned value, const String & fname);
+template int svSetVFile(const String & name, String value, const String & fname);
diff --git a/src/sysvars.hpp b/src/sysvars.hpp
index c1f1d12..f966674 100644
--- a/src/sysvars.hpp
+++ b/src/sysvars.hpp
@@ -1,14 +1,11 @@
 #pragma once
 /** Sysvars library
- * Copyright (c) 2018-2023 Pavel Brychta, pablo@xpablo.cz
+ * Copyright (c) 2018-2024 Pavel Brychta, pablo@xpablo.cz
  *
  * Key-value store/load library with JSON file using internal filesystem
  **/
 
-#include "definefs.hpp"
 #include <Arduino.h>
-#include <ArduinoJson.h>
-#include <FS.h>
 
 enum {
     SV_OK = 0,
@@ -20,88 +17,32 @@ enum {
     SV_KEY_NOT_FOUND = -6,
 };
 
-#if not defined(SYSVAR_FILE)
-    #define SYSVAR_FILE "/cfg.json"
-#endif
-
 /**
  * @brief      Get value
  *
  * @param[in]  name    Name of the key
- * @param      result  Status variable (SV_...)
+ * @param      deflt   Default value
  *
  * @tparam     T       result type
  *
  * @return     Value for the key given
  */
 template <typename T>
-T svGetV(const String & name, int * result = nullptr)
-{
-    T rv{};
-    int res;
-    JsonDocument doc;
-    File f;
-
-    f = USEDFS.open(F(SYSVAR_FILE), "r");
-    if (f) {
-        DeserializationError err = deserializeJson(doc, f);
-        if (err) {
-            res = SV_DESERIALIZE_ERROR; // wrong JSON file (malformed)
-        } else {
-            if (!doc.containsKey(name)) {
-                res = SV_KEY_NOT_FOUND; // key not found
-            } else {
-                rv = doc[name].as<T>();
-                res = SV_OK;
-            }
-        }
-    } else {
-        res = SV_FILE_NOT_FOUND; // file not found
-    }
-    if (result)
-        *result = res; // result code if we are interested
-    return rv;
-}
+T svGetV(const String & name, const T deflt = {});
 
 /**
  * @brief      Get value
  *
  * @param[in]  name    Name of the key
- * @param      result  Status variable (SV_....)
  * @param[in]  fname   Used JSON file name
+ * @param      deflt   Default value
  *
  * @tparam     T       Result type
  *
  * @return     Value for the key given
  */
 template <typename T>
-T svGetV(const String & name, int * result, const String & fname)
-{
-    T rv{};
-    int res;
-    JsonDocument doc;
-    File f;
-
-    f = USEDFS.open(fname, "r");
-    if (f) {
-        DeserializationError err = deserializeJson(doc, f);
-        if (err) {
-            res = SV_DESERIALIZE_ERROR; // wrong (malformed) JSON file
-        } else {
-            if (!doc.containsKey(name)) {
-                res = SV_KEY_NOT_FOUND; // key not found
-            } else {
-                rv = doc[name].as<T>();
-                res = SV_OK;
-            }
-        }
-    } else {
-        res = SV_FILE_NOT_FOUND; // file not found
-    }
-    if (result)
-        *result = res; // result code if we are interested
-    return rv;
-}
+T svGetVFile(const String & name, const String & fname, const T deflt = {});
 
 /**
  * @brief      Store value for the key
@@ -114,31 +55,7 @@ T svGetV(const String & name, int * result, const String & fname)
  * @return     Result (SV_...)
  */
 template <typename T>
-int svSetV(const String & name, T value)
-{
-    int res;
-    JsonDocument doc;
-    File f;
-
-    f = USEDFS.open(F(SYSVAR_FILE), "r");
-    if (f) {
-        DeserializationError err = deserializeJson(doc, f);
-        if (err) {
-            res = SV_DESERIALIZE_ERROR; // wrong (malformed) JSON file
-        }
-        f.close();
-    }
-    doc[name] = value;
-
-    f = USEDFS.open(SYSVAR_FILE, "w");
-    if (f) {
-        serializeJson(doc, f);
-        res = SV_OK;
-    } else {
-        res = SV_FILE_WRITE_ERROR;
-    }
-    return res;
-}
+int svSetV(const String & name, T value);
 
 /**
  * @brief      Store value for the key
@@ -152,29 +69,4 @@ int svSetV(const String & name, T value)
  * @return     Result (SV_...)
  */
 template <typename T>
-int svSetV(const String & name, T value, const String & fname)
-{
-    int res = SV_UNSPECIFIED_ERROR;
-    JsonDocument doc;
-    File f;
-
-    f = USEDFS.open(fname, "r");
-    if (f) {
-        DeserializationError err = deserializeJson(doc, f);
-        if (err) {
-            res = SV_DESERIALIZE_ERROR; // wrong (malformed) JSON file
-        }
-        f.close();
-    }
-    doc[name] = value;
-
-    f = USEDFS.open(fname, "w");
-    if (f) {
-        serializeJson(doc, f);
-        res = SV_OK;
-    } else {
-        res = SV_FILE_WRITE_ERROR;
-    }
-
-    return res;
-}
+int svSetVFile(const String & name, T value, const String & fname);