diff --git a/CMakeLists.txt b/CMakeLists.txt
index ff32a1f..6fb4c05 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,7 +19,7 @@ SET(LIB_METHOD STATIC) #SHARED / STATIC
 option(BUILD_DOC "Build documentation" ON) # additional dependency for Doxygen
 option(PACKAGING "Allow Packaging to <exe>, <deb> or <rpm>" ON) # additional dependencies for RPMbuild,dpkg  or NSIS
 option(TESTS "Build Tests" ON) # additional dependencies for GTEST - to build tests
-option(GUI "Build GUI elements" ON) # additional dependencies to QT libraries needed
+option(GUI "Build GUI elements" OFF) # additional dependencies to QT libraries needed
 set(WinBuild false)
 
 # helper variables
@@ -199,7 +199,7 @@ if (${GUI})
             src/gui/MainWindow.h ${UI_GENERATED_HEADERS})
 
     # LINK generated LIBS #
-    target_link_libraries(iprefresher-gui dynuiprefresher api ${CURL_LIBRARIES} ${LIBCONFIG++_LIBRARIES} ${QT5_LIBRARIES})
+    target_link_libraries(iprefresher-gui -lpthread dynuiprefresher api ${CURL_LIBRARIES} ${LIBCONFIG++_LIBRARIES} ${QT5_LIBRARIES})
 endif ()
 
 # setting install targets
diff --git a/src/gui/MainWindow.cpp b/src/gui/MainWindow.cpp
index 6c1afca..7294823 100644
--- a/src/gui/MainWindow.cpp
+++ b/src/gui/MainWindow.cpp
@@ -1,20 +1,28 @@
-//
-// Created by lukas on 09.05.20.
-//
-
-#include <iostream>
+#include <inc/api/IPAPI.h>
+#include <inc/IPRefresher.h>
 #include "MainWindow.h"
 #include "ui_mainwindow.h"
 
-MainWindow::MainWindow(QWidget *parent) :
-        QMainWindow(parent), ui(new Ui::MainWindow) {
+#include "inc/Config.h"
+#include "inc/Logger.h"
 
+MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) {
     ui->setupUi(this);
-    ui->textLog->
 
-//    ui->labelCurrentIP->setText("currently is nothing to do");
-//    ui->labelConfig->setText("blabliblub");
-//    ui->textfieldname->setText("hangover");
+    // needs to be defined out of scope -- would be termintated after this constructor.
+//    myThread = std::thread([this](){
+//        IPAPI ipapi;
+//        std::string ip = ipapi.getGlobalIp();
+//        Logger::message("Current global IP: " + ip);
+//        std::string msg = "Your current global IP: "+ip;
+//        ui->labelCurrentIP->setText(msg.c_str());
+//    });
+
+
+    if (Config::validateConfig())
+        ui->labelConfig->setText("Config is: OK");
+    else
+        ui->labelConfig->setText("Config is: NOT OK");
 
     connect(ui->buttonCheckConfig, SIGNAL(clicked()), this, SLOT(checkConfigBtn()));
     connect(ui->buttonRefreshIP, SIGNAL(clicked()), this, SLOT(refreshIPBtn()));
@@ -28,11 +36,48 @@ MainWindow::~MainWindow() {
 }
 
 void MainWindow::checkConfigBtn() {
-    std::cout << "btn clicked!" << std::endl;
+    Logger::message("checking config!");
+    appendLogField("checking config!");
 
-    appendLogField("btn clicked! \n");
+    if (Config::validateConfig()) {
+        Logger::message("Config file is OK");
+        appendLogField("Config file is OK");
+        ui->labelConfig->setText("Config is: OK");
+    } else {
+        Logger::error("There are errors in config file!");
+        appendLogField("There are errors in config file!");
+    }
+    appendLogField("");
 }
 
 void MainWindow::refreshIPBtn() {
+    Logger::message("start refreshing Dynu IP.");
+    appendLogField("");
+    appendLogField("start refreshing Dynu IP.");
+new std::thread([this](){
+    IPRefresher ipr;
+    if (Config::readConfig()) {
+        ipr.checkIPAdress(false);
+    } else {
+        std::cout << "incorrect credentials!" << std::endl;
+    }
+
+    Logger::message("Finished refreshing Dynu IP.");
+    appendLogField("Finished refreshing Dynu IP.");
+    delete this;
+});
+//    myThread = std::thread([this](){
+//        IPRefresher ipr;
+//        if (Config::readConfig()) {
+//            ipr.checkIPAdress(false);
+//        } else {
+//            std::cout << "incorrect credentials!" << std::endl;
+//        }
+//
+//        Logger::message("Finished refreshing Dynu IP.");
+//        appendLogField("Finished refreshing Dynu IP.");
+//        ui->textLog->appendPlainText("Finished refreshing Dynu IP.");
+//    });
+
 
 }
\ No newline at end of file
diff --git a/src/gui/MainWindow.h b/src/gui/MainWindow.h
index c954b49..dbdc2b8 100644
--- a/src/gui/MainWindow.h
+++ b/src/gui/MainWindow.h
@@ -4,7 +4,7 @@
 
 #pragma once
 
-
+#include <thread>
 #include <QtWidgets/QMainWindow>
 
 namespace Ui {
@@ -15,11 +15,12 @@ class MainWindow : public QMainWindow{
 Q_OBJECT
 
 public:
-    explicit MainWindow(QWidget *parent = 0);
+    explicit MainWindow(QWidget *parent = nullptr);
     ~MainWindow();
 
 private:
     Ui::MainWindow *ui;
+    std::thread myThread;
 private slots:
 //    void startdownloadBtn();
 void checkConfigBtn();
diff --git a/src/gui/mainwindow.ui b/src/gui/mainwindow.ui
index 2857309..bd9e356 100644
--- a/src/gui/mainwindow.ui
+++ b/src/gui/mainwindow.ui
@@ -32,7 +32,7 @@
      <rect>
       <x>40</x>
       <y>60</y>
-      <width>161</width>
+      <width>301</width>
       <height>17</height>
      </rect>
     </property>
@@ -42,7 +42,7 @@
    </widget>
    <widget class="QPlainTextEdit" name="textLog">
     <property name="enabled">
-     <bool>true</bool>
+     <bool>false</bool>
     </property>
     <property name="geometry">
      <rect>