diff --git a/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/ESPMegaIoT.cpp b/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/ESPMegaIoT.cpp
index d508b09..e4ee713 100644
--- a/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/ESPMegaIoT.cpp
+++ b/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/ESPMegaIoT.cpp
@@ -206,7 +206,7 @@ void ESPMegaIoT::publishCard(uint8_t card_id)
  * 
  * @param topic The topic to subscribe to
  */
-void ESPMegaIoT::subscribe(char *topic)
+void ESPMegaIoT::subscribe(const char *topic)
 {
     mqtt.subscribe(topic);
 }
@@ -216,7 +216,7 @@ void ESPMegaIoT::subscribe(char *topic)
  * 
  * @param topic The topic to unsubscribe from
  */
-void ESPMegaIoT::unsubscribeFromTopic(char *topic)
+void ESPMegaIoT::unsubscribeFromTopic(const char *topic)
 {
     mqtt.unsubscribe(topic);
 }
@@ -227,7 +227,7 @@ void ESPMegaIoT::unsubscribeFromTopic(char *topic)
  * @param ssid The SSID of the wifi network
  * @param password The password of the wifi network
  */
-void ESPMegaIoT::connectToWifi(char *ssid, char *password)
+void ESPMegaIoT::connectToWifi(const char *ssid, const char *password)
 {
     WiFi.begin(ssid, password);
 }
@@ -237,7 +237,7 @@ void ESPMegaIoT::connectToWifi(char *ssid, char *password)
  * 
  * @param ssid The SSID of the wifi network
  */
-void ESPMegaIoT::connectToWifi(char *ssid)
+void ESPMegaIoT::connectToWifi(const char *ssid)
 {
     WiFi.begin(ssid);
 }
@@ -488,7 +488,7 @@ void ESPMegaIoT::unregisterRelativeMqttCallback(uint8_t handler)
  * @param topic The topic to publish to
  * @param payload The payload to publish
  */
-void ESPMegaIoT::publishRelative(char *topic, char *payload)
+void ESPMegaIoT::publishRelative(const char *topic, const char *payload)
 {
     char absolute_topic[100];
     sprintf(absolute_topic, "%s/%s", this->mqtt_config.base_topic, topic);
@@ -501,7 +501,7 @@ void ESPMegaIoT::publishRelative(char *topic, char *payload)
  * 
  * @param topic The topic to subscribe to
  */
-void ESPMegaIoT::subscribeRelative(char *topic)
+void ESPMegaIoT::subscribeRelative(const char *topic)
 {
     char absolute_topic[100];
     sprintf(absolute_topic, "%s/%s", this->mqtt_config.base_topic, topic);
diff --git a/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/ESPMegaIoT.hpp b/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/ESPMegaIoT.hpp
index 70787f6..c595465 100644
--- a/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/ESPMegaIoT.hpp
+++ b/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/ESPMegaIoT.hpp
@@ -78,13 +78,13 @@ public:
     void unregisterCard(uint8_t card_id);
     void publishCard(uint8_t card_id);
     // Publish topic appended with base topic
-    void publishRelative(char *topic, char *payload);
+    void publishRelative(const char *topic, const char *payload);
     // Subscribe topic appended with base topic
-    void subscribeRelative(char *topic);
-    void subscribe(char *topic);
-    void unsubscribeFromTopic(char *topic);
-    void connectToWifi(char *ssid, char *password);
-    void connectToWifi(char *ssid);
+    void subscribeRelative(const char *topic);
+    void subscribe(const char *topic);
+    void unsubscribeFromTopic(const char *topic);
+    void connectToWifi(const char *ssid, const char *password);
+    void connectToWifi(const char *ssid);
     void disconnectFromWifi();
     bool wifiConnected();
     void ethernetBegin();
diff --git a/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/ESPMegaProOS.cpp b/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/ESPMegaProOS.cpp
index 9abc70a..6b47667 100644
--- a/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/ESPMegaProOS.cpp
+++ b/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/ESPMegaProOS.cpp
@@ -27,7 +27,7 @@ bool ESPMegaPRO::begin()
     fram.begin(FRAM_ADDRESS);
     Serial.begin(115200);
     this->installCard(1, &outputs);
-    outputs.bindFRAM(&fram, 0);
+    outputs.bindFRAM(&fram, 0);    
     uint8_t outputPinMap[16] = {8, 9, 10, 11, 12, 13, 14, 15, 0, 1, 2, 3, 4, 5, 6, 7};
     outputs.loadPinMap(outputPinMap);
     outputs.loadFromFRAM();
diff --git a/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/RemoteVariable.cpp b/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/RemoteVariable.cpp
index 5a320a9..2deb82c 100644
--- a/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/RemoteVariable.cpp
+++ b/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/RemoteVariable.cpp
@@ -8,34 +8,39 @@ RemoteVariable::~RemoteVariable() {
     delete this->topic;
     delete this->value;
 }
-void RemoteVariable::begin(size_t size, char* topic, ESPMegaIoT* iot, bool useValueRequest, char* valueRequestTopic) {
+void RemoteVariable::begin(size_t size, const char* topic, ESPMegaIoT* iot, bool useValueRequest, const char* valueRequestTopic) {
     this->iot = iot;
     this->size = size;
-    topic = (char*)calloc(size, sizeof(char));
+    this->topic = topic;
+    this->useValueRequest = useValueRequest;
+    this->valueRequestTopic = valueRequestTopic;
     value = (char*)calloc(size, sizeof(char));
-    this->valueRequestTopic = nullptr;
     auto bindedMqttCallback = std::bind(&RemoteVariable::mqtt_callback, this, std::placeholders::_1, std::placeholders::_2);
     this->iot->registerMqttCallback(bindedMqttCallback);
     auto bindedSubscribe = std::bind(&RemoteVariable::subscribe, this);
     this->iot->registerSubscribeCallback(bindedSubscribe);
+    this->subscribe();
 }
 
-void RemoteVariable::begin(size_t size, char* topic, ESPMegaIoT* iot) {
+void RemoteVariable::begin(size_t size, const char* topic, ESPMegaIoT* iot) {
     this->begin(size, topic, iot, false, nullptr);
 }
 
 void RemoteVariable::subscribe() {
+    ESP_LOGD("RemoteVariable", "Subscribing to %s", this->topic);
     this->iot->subscribe(this->topic);
     if(this->useValueRequest) {
+        ESP_LOGD("RemoteVariable", "Subscribing to %s", this->valueRequestTopic);
         this->requestValue();
     }
 }
 char* RemoteVariable::getValue() {
-    return this->getValue();
+    return this->value;
 }
 
 void RemoteVariable::mqtt_callback(char* topic, char* payload) {
     if (strcmp(topic, this->topic) == 0) {
+        ESP_LOGD("RemoteVariable", "Received MQTT message from %s", topic);
         strcpy(this->value, payload);
     }
 }
@@ -43,15 +48,16 @@ void RemoteVariable::mqtt_callback(char* topic, char* payload) {
 void RemoteVariable::requestValue() {
     if(!this->useValueRequest)
         return;
+    ESP_LOGD("RemoteVariable", "Sending request to %s", this->valueRequestTopic);
     this->iot->publish(this->valueRequestTopic, "request");
 }
 
-void RemoteVariable::enableSetValue(char* setValueTopic) {
+void RemoteVariable::enableSetValue(const char* setValueTopic) {
     this->useSetValue = true;
     this->setValueTopic = setValueTopic;
 }
 
-void RemoteVariable::setValue(char* value) {
+void RemoteVariable::setValue(const char* value) {
     if(!this->useSetValue)
         return;
     this->iot->publish(this->setValueTopic, value);
diff --git a/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/RemoteVariable.hpp b/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/RemoteVariable.hpp
index d9d04e3..fcf7a78 100644
--- a/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/RemoteVariable.hpp
+++ b/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/RemoteVariable.hpp
@@ -5,21 +5,21 @@ class RemoteVariable
     public:
         RemoteVariable();
         ~RemoteVariable();
-        void begin(size_t size, char* topic, ESPMegaIoT* iot);
-        void begin(size_t size, char* topic, ESPMegaIoT* iot, bool useValueRequest, char* valueRequestTopic);
-        void setValue(char* value);
-        void enableSetValue(char* setValueTopic);
+        void begin(size_t size, const char* topic, ESPMegaIoT* iot);
+        void begin(size_t size, const char* topic, ESPMegaIoT* iot, bool useValueRequest, const char* valueRequestTopic);
+        void setValue(const char* value);
+        void enableSetValue(const char* setValueTopic);
         void subscribe();
         void requestValue();
         char* getValue();
     private:
         void mqtt_callback(char* topic, char* payload);
         ESPMegaIoT* iot;
-        char* topic;
+        const char* topic;
         char* value;
         size_t size;
         bool useValueRequest;
-        char* valueRequestTopic;
+        const char* valueRequestTopic;
         bool useSetValue;
-        char* setValueTopic;
+        const char* setValueTopic;
 };
\ No newline at end of file
diff --git a/ESPMegaPRO-OS-SDK/src/main.cpp b/ESPMegaPRO-OS-SDK/src/main.cpp
index 04c632a..edd8963 100644
--- a/ESPMegaPRO-OS-SDK/src/main.cpp
+++ b/ESPMegaPRO-OS-SDK/src/main.cpp
@@ -3,6 +3,7 @@
 #include <ETH.h>
 #include <ClimateCard.hpp>
 #include <ESPMegaDisplayOTA.hpp>
+#include <RemoteVariable.hpp>
 
 // #define FRAM_DEBUG
 // #define MQTT_DEBUG
@@ -17,6 +18,9 @@
 
 ESPMegaPRO espmega = ESPMegaPRO();
 
+// Remote Variable
+RemoteVariable testVar = RemoteVariable();
+
 #ifdef LCD_OTA_ENABLE
 ESPMegaDisplayOTA internalDisplayOTA = ESPMegaDisplayOTA();
 #endif
@@ -191,6 +195,9 @@ void setup()
 #ifdef LCD_OTA_ENABLE
     internalDisplayOTA.begin("/display", espmega.display, espmega.webServer);
 #endif
+    ESP_LOGI("Initializer", "Initializing testvar");
+    testVar.begin(32, "/testvar", espmega.iot, true,"/testvar/request");
+    testVar.enableSetValue("/testvar/set");
 }
 
 void loop()
@@ -225,4 +232,13 @@ void loop()
         Serial.println(espmega.iot->mqttConnected() ? "Connected" : "Disconnected");
     }
 #endif
+    // Print out testvar value every 5 seconds
+    static uint32_t last_testvar_print = 0;
+    if (millis() - last_testvar_print >= 5000)
+    {
+        last_testvar_print = millis();
+        if (testVar.getValue() != nullptr)
+            ESP_LOGI("TestVar", "Value: %s", testVar.getValue());
+        testVar.setValue("Hello World");
+    }
 }
\ No newline at end of file