adding files

4 years ago · 383c49a6e1
commit 383c49a6e1
27 changed files with 5945 additions and 0 deletions
--- a/3
+++ b/3
@ -0,0 +1,3 @@
+
+Initial Application:
+
--- a/HowTo-Cross-Compile.txt
+++ b/HowTo-Cross-Compile.txt
@ -0,0 +1,206 @@
+Cross Compile
+===============================================================================
+
+needed:
+  wine                           
+  wine64
+  mingw-w64                         
+  mingw-w64-tools
+  
+
+=
+= lib-glib
+===============================================================================
+
+cross-file.ini
+
+	[host_machine]
+	system = 'windows'
+	cpu_family = 'x86_64'
+	cpu = 'x86_64'
+	endian = 'little'
+
+	[properties]
+	c_args = []
+	c_link_args = []
+
+	[binaries]
+	c = '/usr/bin/x86_64-w64-mingw32-gcc'
+	cpp = '/usr/bin/x86_64-w64-mingw32-g++'
+	ar = '/usr/bin/x86_64-w64-mingw32-ar'
+	strip = '/usr/bin/x86_64-w64-mingw32-strip'
+	pkgconfig = '/usr/bin/x86_64-w64-mingw32-pkg-config'
+	windres = '/usr/bin/x86_64-w64-mingw32-windres'
+	ld = '/usr/bin/x86_64-w64-mingw32-ld'
+	exe_wrapper = 'wine64'
+
+mkdir build
+cd build
+meson --buildtype=release --prefix=/opt/W64-cross-compile/ --cross-file ../cross-file.ini
+mseon compile
+meson install
+cp `find -name "*.dll"` /opt/W64-cross-compile/lib/
+
+
+=
+= atk
+===============================================================================
+
+cross-file.ini
+
+	[host_machine]
+	system = 'windows'
+	cpu_family = 'x86_64'
+	cpu = 'x86_64'
+	endian = 'little'
+
+	[properties]
+	c_args = []
+	c_link_args = []
+
+	[binaries]
+	c = '/usr/bin/x86_64-w64-mingw32-gcc'
+	cpp = '/usr/bin/x86_64-w64-mingw32-g++'
+	ar = '/usr/bin/x86_64-w64-mingw32-ar'
+	strip = '/usr/bin/x86_64-w64-mingw32-strip'
+	pkgconfig = '/usr/bin/x86_64-w64-mingw32-pkg-config'
+	windres = '/usr/bin/x86_64-w64-mingw32-windres'
+	ld = '/usr/bin/x86_64-w64-mingw32-ld'
+	exe_wrapper = 'wine64'
+
+mkdir build
+cd build
+PKG_CONFIG_PATH=/opt/W64-cross-compile/lib/pkgconfig meson --buildtype=release --prefix=/opt/W64-cross-compile/ --cross-file ../cross-file.ini
+mseon compile
+meson install
+cp `find -name "*.dll"` /opt/W64-cross-compile/lib/
+
+=
+= pango
+===============================================================================
+
+cross-file.ini
+
+	[host_machine]
+	system = 'windows'
+	cpu_family = 'x86_64'
+	cpu = 'x86_64'
+	endian = 'little'
+
+	[properties]
+	c_args = []
+	c_link_args = []
+
+	[binaries]
+	c = '/usr/bin/x86_64-w64-mingw32-gcc'
+	cpp = '/usr/bin/x86_64-w64-mingw32-g++'
+	ar = '/usr/bin/x86_64-w64-mingw32-ar'
+	strip = '/usr/bin/x86_64-w64-mingw32-strip'
+	pkgconfig = '/usr/bin/x86_64-w64-mingw32-pkg-config'
+	windres = '/usr/bin/x86_64-w64-mingw32-windres'
+	ld = '/usr/bin/x86_64-w64-mingw32-ld'
+	exe_wrapper = 'wine64'
+
+mkdir build
+cd build
+PKG_CONFIG_PATH=/opt/W64-cross-compile/lib/pkgconfig meson --buildtype=release --prefix=/opt/W64-cross-compile/ --cross-file ../cross-file.ini
+mseon compile
+meson install
+cp `find -name "*.dll"` /opt/W64-cross-compile/lib/
+
+
+=
+= gdk-pixbuf
+===============================================================================
+
+cross-file.ini
+
+	[host_machine]
+	system = 'windows'
+	cpu_family = 'x86_64'
+	cpu = 'x86_64'
+	endian = 'little'
+
+	[properties]
+	c_args = []
+	c_link_args = []
+
+	[binaries]
+	c = '/usr/bin/x86_64-w64-mingw32-gcc'
+	cpp = '/usr/bin/x86_64-w64-mingw32-g++'
+	ar = '/usr/bin/x86_64-w64-mingw32-ar'
+	strip = '/usr/bin/x86_64-w64-mingw32-strip'
+	pkgconfig = '/usr/bin/x86_64-w64-mingw32-pkg-config'
+	windres = '/usr/bin/x86_64-w64-mingw32-windres'
+	ld = '/usr/bin/x86_64-w64-mingw32-ld'
+	exe_wrapper = 'wine64'
+
+mkdir build
+cd build
+PKG_CONFIG_PATH=/opt/W64-cross-compile/lib/pkgconfig meson --buildtype=release --prefix=/opt/W64-cross-compile/ --cross-file ../cross-file.ini
+mseon compile
+meson install
+cp `find -name "*.dll"` /opt/W64-cross-compile/lib/
+
+
+=
+= libepoxy
+===============================================================================
+
+cross-file.ini
+
+	[host_machine]
+	system = 'windows'
+	cpu_family = 'x86_64'
+	cpu = 'x86_64'
+	endian = 'little'
+
+	[properties]
+	c_args = []
+	c_link_args = []
+
+	[binaries]
+	c = '/usr/bin/x86_64-w64-mingw32-gcc'
+	cpp = '/usr/bin/x86_64-w64-mingw32-g++'
+	ar = '/usr/bin/x86_64-w64-mingw32-ar'
+	strip = '/usr/bin/x86_64-w64-mingw32-strip'
+	pkgconfig = '/usr/bin/x86_64-w64-mingw32-pkg-config'
+	windres = '/usr/bin/x86_64-w64-mingw32-windres'
+	ld = '/usr/bin/x86_64-w64-mingw32-ld'
+	exe_wrapper = 'wine64'
+
+mkdir build
+cd build
+PKG_CONFIG_PATH=/opt/W64-cross-compile/lib/pkgconfig meson --buildtype=release --prefix=/opt/W64-cross-compile/ --cross-file ../cross-file.ini
+mseon compile
+meson install
+cp `find -name "*.dll"` /opt/W64-cross-compile/lib/
+
+
+
+=
+= GTK
+===============================================================================
+cp /opt/W64-cross-compile/bin/*.exe ~/.wine/drive_c/windows/system32/
+cp /opt/W64-cross-compile/lib/*.dll ~/.wine/drive_c/windows/system32/
+
+vim gdk/win32/gdkprivate-win32.h  .... 
+search around line 300.. and add the extern expression
+300 /* The singleton selection object pointer */
+301 extern GdkWin32Selection *_win32_selection;
+
+PKG_CONFIG_PATH=/opt/W64-cross-compile/lib/pkgconfig ./configure --prefix=/opt/W64-cross-compile/ --host=x86_64-w64-mingw32
+PKG_CONFIG_PATH=/opt/W64-cross-compile/lib/pkgconfig make
+make install
+
+will fail with 
+/bin/bash: Zeile 1: ../../gtk/gtk-update-icon-cache.exe: Kann die Binärdatei nicht ausführen: Fehler im Format der Programmdatei
+make[3]: *** [Makefile:1673: install-update-icon-cache] Fehler 126
+edit the Makefile in demos/gtk-demos and add in line the wine prefix.
+the same we do for
+/bin/bash: Zeile 1: ../../gtk/gtk-update-icon-cache.exe: Kann die Binärdatei nicht ausführen: Fehler im Format der Programmdatei
+make[5]: *** [Makefile:1184: install-update-icon-cache] Fehler 126
+make[5]: Verzeichnis „/home/steffen/gtkcrosscompile/gtk+-3.24.0/demos/widget-factory“ wird verlassen
+make install
+cp `find -name "*.dll"` /opt/W64-cross-compile/lib/
+
--- a/6
+++ b/6
@ -0,0 +1,6 @@
+
+The license model for this software (TestModbus-Server) is not yet choosen.
+At the moment you can use this software free of charge at your own risk.
+
+06.Sep.2021 Steffen Pohle
+
--- a/128
+++ b/128
@ -0,0 +1,128 @@
+.SILENT: help
+VERSION = 1.0.0
+APP = testmodbus-server
+
+-include Makefile.rules
+
+OBJECTS = gui.oo main.oo mbsconfig.oo modbus.oo guimodbusdata.oo guivalues.oo json.oo tcp.oo
+DISTNAME=testmodbus-server-$(VERSION)
+
+ifeq ($(TARGET),)
+noconfig: help
+endif
+
+all: Makefile.rules $(TARGET)
+
+help:
+	echo "set up configuration"
+	echo "   make configwindows    to generate the windows build"
+	echo "   make configcross      to generate the windows cross build"
+	echo "   make configlinux      to generate the linix build"
+	echo "   make buildwindows     to generate the build for windows (uses cross compiler)"
+	
+configlinux: clean
+	cp -f Makefile.rules.linux Makefile.rules
+	make config
+
+configwindows: clean
+	cp -f Makefile.rules.windows Makefile.rules
+	make config
+
+configcross: clean
+	cp -f Makefile.rules.crosswindows Makefile.rules
+	make config
+
+config: Makefile.rules
+	echo "#ifndef _CONFIG_H_" > config.h
+	echo "#define _CONFIG_H_" >> config.h
+	echo "" >> config.h
+	echo "#define VERSION \"$(VERSION)\"" >> config.h
+	echo "" >> config.h
+	echo "#endif" >> config.h
+
+
+$(TARGET): $(OBJECTS)
+	$(CPP) -o $(TARGET) $(OBJECTS) $(LDFLAGS) $(LIBS)
+
+.SUFFIXES:
+.SUFFIXES:	.c .cc .C .cpp .oo
+
+.cc.oo : $(INCLUDES)
+	$(CPP) -o $@ -c $(CPPFLAGS) $<
+
+clean:
+	rm -f *.o *.oo *.c~ *.h~ *.cc~ *.ui~ $(APP) Makefile~
+	rm -rf *.dll
+	rm -rf *.exe
+	rm -rf Makefile.rules
+	rm -rf test-fc16
+	rm -rf test-fc15
+
+dist: clean
+	rm -rf $(DISTNAME)
+	mkdir $(DISTNAME)
+	cp Makefile* $(DISTNAME)
+	cp Readme $(DISTNAME)
+	cp COPYING $(DISTNAME)
+	cp Changelog $(DISTNAME)
+	cp *.ui $(DISTNAME)
+	mkdir $(DISTNAME)/othersources
+	cp -r othersources/gdk-pixbuf-2.42.6.tar.xz $(DISTNAME)/othersources
+	cp -r othersources/glib-main.tar.bz2 $(DISTNAME)/othersources
+	cp -r othersources/gtk+-3.24.0.tar.xz $(DISTNAME)/othersources
+	cp -r othersources/libepoxy-master.zip $(DISTNAME)/othersources
+	cp -r othersources/*.txt  $(DISTNAME)/othersources
+	cp -r othersources/pango-1.48.7.tar.xz $(DISTNAME)/othersources
+	cp -rf *.h $(DISTNAME)
+	cp -rf *.cc $(DISTNAME) 
+	tar cvzf $(DISTNAME).tgz $(DISTNAME)
+	rm -rf $(DISTNAME)
+
+dep:
+	$(CXX) -MM `ls *.cc` $(CXXFLAGS) > $(DEPENDFILE)
+
+test-fc16: test-fc16.cc
+	 $(CPP) -o test-fc16 test-fc16.cc $(LDFLAGS) -I/usr/include -I/usr/local/include -L/usr/local/lib -L/usr/lib
+
+test-fc15: test-fc15.cc
+	 $(CPP) -o test-fc15 test-fc15.cc $(LDFLAGS) -I/usr/include -I/usr/local/include -L/usr/local/lib -L/usr/lib
+
+copydll: $(TARGET)
+	echo "delete all librarys"
+	rm -rf *.dll
+	echo "copy linked dll first level"
+	cp -vf `ldd testmodbus-server.exe  | grep .dll | grep /mingw64/bin | cut -d' ' -f3 ` ./
+	echo "copy network dll"
+	cp /usr/lib/*UDPTCPNetwork.dll ./
+	echo "copy linked dll second level"
+	cp -vf `ldd testmodbus-server.exe  | grep .dll | grep /mingw64/bin | cut -d' ' -f3 ` ./
+
+
+buildwindows:
+	rm -rf TestModbus-Server-$(VERSION)
+	mkdir TestModbus-Server-$(VERSION)
+	make clean
+	make configcross
+	make $(TARGET)
+	cp testmodbus-server.exe TestModbus-Server-$(VERSION)/
+	cp testmodbus-server.ui TestModbus-Server-$(VERSION)/
+	cp testmodbus-server.png TestModbus-Server-$(VERSION)/
+	cp Readme TestModbus-Server-$(VERSION)/
+	cp Changelog TestModbus-Server-$(VERSION)/
+	cp COPYING TestModbus-Server-$(VERSION)/
+	mkdir TestModbus-Server-$(VERSION)/othersources
+	cp -r othersources/gdk-pixbuf-2.42.6.tar.xz TestModbus-Server-$(VERSION)/othersources
+	cp -r othersources/glib-main.tar.bz2 TestModbus-Server-$(VERSION)/othersources
+	cp -r othersources/gtk+-3.24.0.tar.xz TestModbus-Server-$(VERSION)/othersources
+	cp -r othersources/libepoxy-master.zip TestModbus-Server-$(VERSION)/othersources
+	cp -r othersources/*.txt TestModbus-Server-$(VERSION)/othersources
+	cp -r othersources/pango-1.48.7.tar.xz TestModbus-Server-$(VERSION)/othersources
+	tar xvzf othersources/winbuild-dll.tgz -C TestModbus-Server-$(VERSION)/
+	tar xvzf othersources/winbuild-share.tgz -C TestModbus-Server-$(VERSION)/
+	
+
+-include $(DEPENDFILE)
+
+.PHONY: all
+.PHONY: count
+.PHONY: clean
--- a/Makefile.rules.crosswindows
+++ b/Makefile.rules.crosswindows
@ -0,0 +1,8 @@
+
+TARGET = $(APP).exe
+
+CPP = /usr/bin/x86_64-w64-mingw32-g++
+CPPFLAGS = -ggdb -Wall -O0 `PKG_CONFIG_PATH=/opt/W64-cross-compile/lib/pkgconfig pkg-config --cflags gtk+-3.0 gmodule-export-2.0` -Wl,--export-dynamic -DBUILD_WINDOWS=1 -Wdeprecated
+INCLUDES = 
+LDFLAGS = -lws2_32 
+LIBS = `PKG_CONFIG_PATH=/opt/W64-cross-compile/lib/pkgconfig pkg-config --libs gtk+-3.0 gmodule-export-2.0` -L/usr/lib -mwindows
--- a/Makefile.rules.linux
+++ b/Makefile.rules.linux
@ -0,0 +1,8 @@
+
+TARGET = $(APP)
+
+CPP = c++
+CPPFLAGS = -ggdb -Wall -O0 `pkg-config --cflags gtk+-3.0 gmodule-export-2.0` -Wl,--export-dynamic -I/usr/include -DBUILD_LINUX=1
+INCLUDES = 
+LDFLAGS = 
+LIBS = `pkg-config --libs gtk+-3.0 gmodule-export-2.0` -L/usr/lib
--- a/Makefile.rules.windows
+++ b/Makefile.rules.windows
@ -0,0 +1,8 @@
+
+TARGET = $(APP).exe
+
+CPP = g++
+CPPFLAGS = -ggdb -Wall -O0 `pkg-config --cflags gtk+-3.0 gmodule-export-2.0` -Wl,--export-dynamic -I/usr/include -DBUILD_WINDOWS=1
+INCLUDES = 
+LDFLAGS = -lWs2_32 
+LIBS = `pkg-config --libs gtk+-3.0 gmodule-export-2.0` -L/usr/lib
--- a/README.md
+++ b/README.md
@ -0,0 +1,34 @@
+# testmodbus-server
+
+This programm is used for testing modbus-tcpip configuations. 
+If you do not know what modbus-tcpip mean stop using this programm. 
+
+This software is written by Steffen Pohle (steffen@gulpe.de), check for a 
+newer version of this software at https://steffen.gulpe.de/modbus-tcpip/
+
+![Image_01](https://steffen.gulpe.de/modbus-tcpip/screenshot-winver1-0-0-regs.PNG)
+![Image_02](https://steffen.gulpe.de/modbus-tcpip/screenshot-winver1-0-0-values.PNG)
+
+
+# Compilation
+	make configlinux
+	make
+
+
+# Installation
+not supported.
+
+
+# Cross Compilation for Windows (build on Debian, target Windows)
+Configue the Makefiles.rules.crosswindows file to your needs. 
+A little manual on my cross compilation setup can be found 
+in HowTo-Cross-Compile.txt. Make sure you copy all needed dll
+files to dll in this directory.
+
+	make buildwindows
+
+All needed files will be placed in a separate subfolder together with all 
+needed librarys (needs to prepared, see Makefile for some hints).
+
+For precompiled windows binarys look at this [link](https://steffen.gulpe.de/modbus-tcpip/).
+
--- a/gui.cc
+++ b/gui.cc
@ -0,0 +1,773 @@
+///////////////////////////////////////////////////////////////////////////////// 
+//
+// gui.cc is part of TestModbus-Server.
+//
+///////////////////////////////////////////////////////////////////////////////// 
+
+#if defined(_WIN32) || defined(_WIN64) || defined(__CYGWIN__)
+#else
+  #include <unistd.h> /* close() */
+#endif
+#include <stdio.h>
+#include <list>
+#include "gui.h"
+#include "modbus.h"
+#include "guivalues.h"
+#include "json.h"
+#include "mbsconfig.h"
+#include "config.h"
+
+extern GtkBuilder *_builder_;			// work around for threads
+extern void addvar_displaywithvalues (gpointer data, GuiValue *v);
+
+//////////////////////////////////////////////////////////////////////////////////////////////////
+//
+// call back functions
+//
+
+gboolean cb_window_delete_event (GtkWidget *widget, GdkEvent  *event, gpointer   data) {
+//	GtkBuilder *builder = (GtkBuilder *) data;
+
+	cb_menu_save(widget, data);
+
+	return FALSE;
+}
+
+void cb_window_show (GtkWidget *widget, gpointer data) {
+//	GtkBuilder *builder = (GtkBuilder *) data;
+	mbdata_show(widget, data);
+	valdata_show(widget, data);
+
+	g_timeout_add(100, Value_Loop, NULL);
+};
+
+
+void cb_menu_new (GtkWidget *widget, gpointer   data) {
+//	GtkBuilder *builder = (GtkBuilder *) data;
+	modbus.EnableAll(0);
+	MBData_EnableAll(0);
+	modbus.RequestsClear();
+	MBData_ReqReset ();
+	Value_DelAll();
+};
+
+
+void cb_menu_open (GtkWidget *widget, gpointer   data) {
+	GtkBuilder *builder = (GtkBuilder *) data;
+	GtkWindow *window = GTK_WINDOW (gtk_builder_get_object (builder, "testmodbus-server"));
+	GtkWidget *dialog;
+	GtkFileChooserAction action = GTK_FILE_CHOOSER_ACTION_OPEN;
+	GtkFileFilter *filter;
+	gint res;
+
+	printf ("%s:%d %s\n", __FILE__, __LINE__, __FUNCTION__);
+	dialog = gtk_file_chooser_dialog_new ("Open File",
+										  window,
+	                                      action,
+	                                      "_Cancel",
+	                                      GTK_RESPONSE_CANCEL,
+	                                      "_Open",
+	                                      GTK_RESPONSE_ACCEPT,
+	                                      NULL);
+
+	filter = gtk_file_filter_new();
+	gtk_file_filter_add_pattern(filter, "*.modbus");
+	gtk_file_filter_set_name(filter, "Test Modbus Config");
+	gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(dialog), filter);
+	filter = gtk_file_filter_new();
+	gtk_file_filter_add_pattern(filter, "*.*");
+	gtk_file_filter_set_name(filter, "All Files");
+	gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(dialog), filter);
+
+	res = gtk_dialog_run (GTK_DIALOG (dialog));
+	if (res == GTK_RESPONSE_ACCEPT) {
+	    char *filename;
+	    GtkFileChooser *chooser = GTK_FILE_CHOOSER (dialog);
+	    filename = gtk_file_chooser_get_filename (chooser);
+	    config.SetFilename(filename);
+	    g_free (filename);
+		load_file(config.GetFilename().c_str());
+	}
+	gtk_widget_destroy (dialog);
+};
+
+
+void cb_menu_save (GtkWidget *widget, gpointer   data) {
+//	GtkBuilder *builder = (GtkBuilder *) data;
+
+	if (config.GetFilename().length() == 0)
+		cb_menu_saveas (widget, data);
+	else {
+		save_file(config.GetFilename().c_str());
+	}
+};
+
+
+void cb_menu_saveas (GtkWidget *widget, gpointer   data) {
+	GtkBuilder *builder = (GtkBuilder *) data;
+	GtkWindow *window = GTK_WINDOW (gtk_builder_get_object (builder, "testmodbus-server"));
+	GtkWidget *dialog;
+	GtkFileChooser *chooser;
+	GtkFileChooserAction action = GTK_FILE_CHOOSER_ACTION_SAVE;
+	GtkFileFilter *filter;
+	gint res;
+
+    dialog = gtk_file_chooser_dialog_new ("Save File",
+	                                      window,
+	                                      action,
+	                                      "_Cancel",
+	                                      GTK_RESPONSE_CANCEL,
+	                                      "_Save",
+	                                      GTK_RESPONSE_ACCEPT,
+	                                      NULL);
+	chooser = GTK_FILE_CHOOSER (dialog);
+
+	filter = gtk_file_filter_new();
+	gtk_file_filter_add_pattern(filter, "*.modbus");
+	gtk_file_filter_set_name(filter, "Test Modbus Config");
+	gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(dialog), filter);
+	filter = gtk_file_filter_new();
+	gtk_file_filter_add_pattern(filter, "*.*");
+	gtk_file_filter_set_name(filter, "All Files");
+	gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(dialog), filter);
+
+	gtk_file_chooser_set_do_overwrite_confirmation (chooser, TRUE);
+	if (config.GetFilename().length () == 0)
+	  gtk_file_chooser_set_current_name (chooser, "noname.modbus");
+	else
+	  gtk_file_chooser_set_filename (chooser, config.GetFilename().c_str());
+
+	res = gtk_dialog_run (GTK_DIALOG (dialog));
+
+	if (res == GTK_RESPONSE_ACCEPT) {
+	    char *filename;
+
+	    filename = gtk_file_chooser_get_filename (chooser);
+
+	    config.SetFilename(filename);
+	    cb_menu_save (widget, data);
+	    g_free (filename);
+	}
+
+	gtk_widget_destroy (dialog);
+};
+
+
+void cb_menu_quit (GtkWidget *widget, gpointer   data) {
+	GtkBuilder *builder = (GtkBuilder *) data;
+	GtkWindow *window = GTK_WINDOW (gtk_builder_get_object (builder, "testmodbus-server"));
+
+	cb_menu_save(widget, data);
+
+	gtk_window_close(window);
+};
+
+
+//
+// try to set new port
+void cb_port_enter (GtkWidget *widget, gpointer data) {
+	config.SetPort(atoi(gtk_entry_get_text (GTK_ENTRY(widget))));
+	gtk_entry_set_text(GTK_ENTRY(widget), std::to_string(config.GetPort()).c_str());
+};
+
+
+void cb_btn_start (GtkWidget *widget, gpointer data) {
+	GtkBuilder *builder = (GtkBuilder *) data;
+	GtkWidget *portentry = GTK_WIDGET (gtk_builder_get_object (builder, "port_entry"));
+
+	int port = atoi(gtk_entry_get_text(GTK_ENTRY(portentry)));
+
+	if (modbus.isRunning()) {
+		printf ("Stop Server\n");
+		modbus.Stop();
+		gtk_widget_set_sensitive(portentry, TRUE);
+		gtk_button_set_label(GTK_BUTTON(widget), _("Start"));
+	}
+	else {
+		printf ("Start Server (port: %d)\n", port);
+		if (modbus.Start(port)) {
+			gtk_button_set_label(GTK_BUTTON(widget),_("Stop"));
+			gtk_widget_set_sensitive(portentry, FALSE);
+		}
+		usleep (250000);
+		if (modbus.isRunning() == 0) {
+			modbus.Stop();
+			displayerror("modbus server could not been started.\nSee console output for errors.");
+			gtk_widget_set_sensitive(portentry, TRUE);
+			gtk_button_set_label(GTK_BUTTON(widget), _("Start"));
+		}
+	}
+};
+
+
+
+void addvar_displaywithvalues (gpointer data, GuiValue *v) {
+	GtkBuilder *builder = (GtkBuilder *) data;
+	GtkWidget *dlg = GTK_WIDGET (gtk_builder_get_object (builder, "addvar"));
+	GtkWidget *reg = GTK_WIDGET (gtk_builder_get_object (builder, "adddlg_regnum"));
+	GtkWidget *typeCB = GTK_WIDGET (gtk_builder_get_object (builder, "adddlg_type"));
+	GtkWidget *simCB = GTK_WIDGET (gtk_builder_get_object (builder, "adddlg_simmulation"));
+	GtkWidget *name = GTK_WIDGET (gtk_builder_get_object (builder, "adddlg_name"));
+	GtkWidget *value = GTK_WIDGET (gtk_builder_get_object (builder, "adddlg_value"));
+	GtkWidget *change = GTK_WIDGET (gtk_builder_get_object (builder, "adddlg_change"));
+	GtkWidget *fc[4];
+	int i, fcnum;
+
+	GtkWidget *type = gtk_bin_get_child(GTK_BIN(typeCB));
+	GtkWidget *sim = gtk_bin_get_child(GTK_BIN(simCB));
+
+	gtk_entry_set_text(GTK_ENTRY(name), "noname");
+
+	if (v == NULL) {
+		fcnum = 1;
+	}
+	else if (v->fc < 1 || v-> fc > 4) fcnum = 1;
+	else fcnum = v->fc;
+
+	for (i = 0; i < 4; i++) {
+		fc[i] = GTK_WIDGET (gtk_builder_get_object (builder, ((string)"adddlg_FC"+std::to_string(i+1)).c_str()));
+	}
+
+	if (v != NULL) {
+		gtk_entry_set_text(GTK_ENTRY(name), v->name.c_str());
+		gtk_entry_set_text(GTK_ENTRY(value), v->value.c_str());
+		gtk_entry_set_text(GTK_ENTRY(type), v->type.c_str());
+		gtk_entry_set_text(GTK_ENTRY(sim), v->sim.c_str());
+		gtk_entry_set_text(GTK_ENTRY(reg), std::to_string(v->reg).c_str());
+	}
+	gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(fc[fcnum-1]), true);
+	gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(change), false);
+
+	gint result = gtk_dialog_run(GTK_DIALOG(dlg));
+	if (result == GTK_RESPONSE_ACCEPT || result == GTK_RESPONSE_APPLY) {
+		GuiValue vn;
+		vn.value = gtk_entry_get_text(GTK_ENTRY(value));
+		vn.name = gtk_entry_get_text(GTK_ENTRY(name));
+		vn.type = gtk_entry_get_text(GTK_ENTRY(type));
+		vn.sim = gtk_entry_get_text(GTK_ENTRY(sim));
+		vn.reg = atoi (gtk_entry_get_text(GTK_ENTRY(reg)));
+		for (i = 0; i < 4; i++) {
+			if (gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(fc[i]))) vn.fc = i+1;
+		}
+		Value_Set(&vn);   // this will reset the vn.value with the reigsters..
+		if (gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(change)) == true) {
+			uint16_t regvals[4];
+			int regstowrite = 1;
+
+			vn.value = gtk_entry_get_text(GTK_ENTRY(value));	// load the from the entry
+			if (Value_SetValue(vn.value, vn.type, vn.fc, &regstowrite, regvals)) {
+				modbus.SetRegValue(vn.fc, vn.reg, regstowrite, (uint16_t*)regvals);
+			}
+
+		}
+	}
+	gtk_widget_hide(GTK_WIDGET(dlg));
+};
+
+void cb_btn_addvar (GtkWidget *widget, gpointer data) {
+	addvar_displaywithvalues(data, NULL);
+};
+
+
+void cb_btn_editvar (GtkWidget *widget, gpointer data) {
+	GuiValue v;
+	GtkTreeIter iter;
+	GtkTreeModel *model;
+	GtkWidget *vars = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "vars_tv"));
+	gchar *v_name;
+	gchar *v_fc;
+	gchar *v_reg;
+	gchar *v_type;
+	gchar *v_sim;
+	gchar *v_value;
+	GtkTreeSelection *sel;
+
+	sel = gtk_tree_view_get_selection(GTK_TREE_VIEW(vars));
+	if (sel && gtk_tree_selection_get_selected(GTK_TREE_SELECTION(sel), &model, &iter)) {
+		gtk_tree_model_get (model, &iter,
+				VALDATA_COL_NAME, &v_name,
+				VALDATA_COL_FC, &v_fc,
+				VALDATA_COL_REGSTART, &v_reg,
+				VALDATA_COL_TYPE, &v_type,
+				VALDATA_COL_SIM, &v_sim,
+				VALDATA_COL_VALUE, &v_value,
+				-1);
+
+		v.name = v_name;
+		v.reg = atoi (v_reg);
+		v.fc = atoi (v_fc);
+		v.type = v_type;
+		v.sim = v_sim;
+		v.value = v_value;
+
+		addvar_displaywithvalues(data, &v);
+	}
+};
+
+void cb_btn_delvar (GtkWidget *widget, gpointer data) {
+	GtkTreeIter iter;
+	GtkTreeModel *model;
+	GtkWidget *vars = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "vars_tv"));
+	gchar *v_name;
+	GtkTreeSelection *sel;
+
+	sel = gtk_tree_view_get_selection(GTK_TREE_VIEW(vars));
+	if (sel && gtk_tree_selection_get_selected(GTK_TREE_SELECTION(sel), &model, &iter)) {
+		gtk_tree_model_get (model, &iter,
+				VALDATA_COL_NAME, &v_name,
+				-1);
+		Value_Del(v_name);
+		g_free (v_name);
+	}
+
+};
+
+//////////////////////////////////////////////////////
+//
+// update gui/add netdata side
+//
+gboolean cb_thread_network_data_add (gpointer data) {
+	GtkWidget *textview = GTK_WIDGET(gtk_builder_get_object (_builder_, "network_text"));
+	GtkTextBuffer *textbuffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(textview));
+	GtkTextIter start, end;
+
+	if (data) {
+		struct modbus_data *mbdata = (struct modbus_data *)data;
+		std::string text;
+		char timetext[255];
+		GtkTextTag *tag_datetime;
+		GtkTextTag *tag_data;
+		GtkTextTag *tag_info;
+		GtkTextTag *tag_modbus;
+		time_t _tm =time(NULL);
+		struct tm * curtime = localtime (&_tm);
+		static int _once = 0;
+
+		if (_once == 0) {
+			_once = 1;
+			tag_datetime = gtk_text_buffer_create_tag (textbuffer, "Date_Time",
+						"foreground", "blue", "style", PANGO_WEIGHT_BOLD, "family", "Monospace", NULL);
+			tag_data = gtk_text_buffer_create_tag (textbuffer, "Data",
+						"foreground", "black", "style", PANGO_WEIGHT_NORMAL, "family", "Monospace", NULL);
+			tag_info = gtk_text_buffer_create_tag (textbuffer, "Info",
+						"foreground", "green", "style", PANGO_WEIGHT_THIN, "family", "Sans", NULL);
+			tag_modbus = gtk_text_buffer_create_tag (textbuffer, "Modbus",
+						"foreground", "black", "style", PANGO_WEIGHT_NORMAL, "family", "Sans", NULL);
+		}
+		strftime (timetext, 255, "%H:%M:%S", curtime);
+
+		//
+		// build hex dump
+		//
+		text = "";
+		for (int i = 0; i < mbdata->bufferlen; i++) {
+			unsigned char c = mbdata->buffer[i];
+			char hexnum[] = "0123456789ABCDEF";
+
+			if (i == 0) text += "        ";
+			else if (i % 32 == 0) text += "\n        ";
+			else if (i % 4  == 0 && i > 0) text += " : ";
+			else if (i % 2  == 0 && i > 0) text += ":";
+//			else text += " ";
+
+			text += hexnum[c/16];
+			text += hexnum[c%16];
+		}
+		gtk_text_buffer_get_start_iter(textbuffer, &start);
+		gtk_text_buffer_insert_with_tags_by_name(textbuffer, &start, text.c_str(), -1, "Data", NULL);
+
+		//
+		// first line
+		//
+		text = "";
+		if (mbdata->fc != 0) {
+			text = text + "\n  TransactionID: " + std::to_string(mbdata->transactionid);
+			text = text + "  ProtocolID: " + std::to_string(mbdata->protoolid);
+			text = text + "  Length: " + std::to_string(mbdata->length);
+			text = text + "\n  UnitID: " + std::to_string(mbdata->unitid);
+			if (mbdata->fc < 10) text = text + "  FC0" + std::to_string(mbdata->fc);
+			else 				 text = text + "  FC" + std::to_string(mbdata->fc);
+			if (mbdata->fc >= 5) {
+				text = text + " WRITE ";
+				if (mbdata->fc == 5)
+					text = text + " Flag/Coil: " + std::to_string(mbdata->regstart);
+				else if (mbdata->fc == 6)
+					text = text + "  Register: " + std::to_string(mbdata->regstart);
+				else if (mbdata->fc == 15)
+					text = text + " Flag/Coil: " + std::to_string(mbdata->regstart) + " Count: " + std::to_string (mbdata->regcnt);
+				else if (mbdata->fc == 16)
+					text = text + " Register: " + std::to_string(mbdata->regstart) + " Count: " + std::to_string (mbdata->regcnt);
+			}
+			else {
+				text = text + " Registers: " + std::to_string (mbdata->regstart);
+				text = text + " Bytes: " + std::to_string (mbdata->regcnt);
+			}
+		}
+		text = text + "\n";
+		gtk_text_buffer_get_start_iter(textbuffer, &start);
+		gtk_text_buffer_insert_with_tags_by_name(textbuffer, &start, text.c_str(), -1, "Modbus", NULL);
+
+		//
+		//
+		text ="";
+		text += mbdata->hostname;
+		if (mbdata->direction == 0) text = text + " RECV ";
+		else 						text = text + " SEND ";
+		text = text + std::to_string(mbdata->bufferlen) + " Bytes";
+		gtk_text_buffer_get_start_iter(textbuffer, &start);
+		gtk_text_buffer_insert_with_tags_by_name(textbuffer, &start, text.c_str(), -1, "Info", NULL);
+
+
+		//
+		// add date
+		//
+		text = "\n";
+		text += timetext;
+		text += "  ";
+		gtk_text_buffer_get_start_iter(textbuffer, &start);
+		gtk_text_buffer_insert_with_tags_by_name(textbuffer, &start, text.c_str(), -1, "Date_Time", NULL);
+
+		free (mbdata);
+	}
+
+	gtk_text_buffer_get_iter_at_line(textbuffer, &start, 2000);
+	gtk_text_buffer_get_iter_at_line(textbuffer, &end, 2050);
+	gtk_text_buffer_delete(textbuffer, &start, &end);
+
+	return FALSE;
+};
+
+
+//////////////////////////////////////////////////////
+//
+// add a text line
+//
+gboolean cb_thread_network_text_add (gpointer data) {
+	if (data) {
+		std::string text;
+		char timetext[255];
+		GtkWidget *textview = GTK_WIDGET(gtk_builder_get_object (_builder_, "network_text"));
+		GtkTextBuffer *textbuffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(textview));
+		GtkTextIter start, end;
+		GtkTextTag *tag_datetime;
+		GtkTextTag *tag_info;
+		char *textprm = (char*) data;
+		time_t _tm =time(NULL);
+		struct tm * curtime = localtime (&_tm);
+		static int _once = 0;
+
+		if (_once == 0) {
+			_once = 1;
+			tag_datetime = gtk_text_buffer_create_tag (textbuffer, "Date_Time",
+						"foreground", "blue", "style", PANGO_WEIGHT_BOLD, "family", "Monospace", NULL);
+			tag_info = gtk_text_buffer_create_tag (textbuffer, "Connection",
+						"foreground", "red", "style", PANGO_WEIGHT_BOLD, "family", "Sans", NULL);
+		}
+
+		strftime (timetext, 255, "%H:%M:%S", curtime);
+
+		//
+		// build hex dump
+		//
+		//
+		//
+		text ="";
+		text += textprm;
+		gtk_text_buffer_get_start_iter(textbuffer, &start);
+		gtk_text_buffer_insert_with_tags_by_name(textbuffer, &start, text.c_str(), -1, "Connection", NULL);
+
+		//
+		// add date
+		//
+		text = "\n";
+		text += timetext;
+		text += "  ";
+		gtk_text_buffer_get_start_iter(textbuffer, &start);
+		gtk_text_buffer_insert_with_tags_by_name(textbuffer, &start, text.c_str(), -1, "Date_Time", NULL);
+
+		free (textprm);
+	}
+
+	return FALSE;
+};
+
+
+gboolean cb_thread_status (gpointer data) {
+	string *s = (string *)data;
+	GtkWidget *status = GTK_WIDGET(gtk_builder_get_object (_builder_, "status_lb"));
+	gtk_label_set_text(GTK_LABEL(status), s->c_str());
+	return FALSE;
+}
+
+void cb_networkdata_show (GtkWidget *widget, gpointer data) {
+	GtkWidget *textview = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(data), "network_text"));
+	GtkTextBuffer *textbuffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(textview));
+
+	printf ("*************************** \n");
+
+};
+
+void cb_addvar_close (GtkWidget *widget, gpointer data) {
+	GtkBuilder *builder = (GtkBuilder *) data;
+	GtkWidget *dlg = GTK_WIDGET (gtk_builder_get_object (builder, "addvar"));
+	printf ("%s\n", __FUNCTION__);
+
+	gtk_dialog_response(GTK_DIALOG(dlg), GTK_RESPONSE_CANCEL);
+};
+
+
+void displayerror (string error) {
+	GtkWidget *dialog;
+	GtkWidget *window = GTK_WIDGET (gtk_builder_get_object (_builder_, "testmodbus-server"));
+	dialog = gtk_message_dialog_new(GTK_WINDOW(window),
+			 GTK_DIALOG_DESTROY_WITH_PARENT,
+			 GTK_MESSAGE_ERROR,
+			 GTK_BUTTONS_OK,
+			 error.c_str());
+	gtk_window_set_title(GTK_WINDOW(dialog), "Error");
+	gtk_dialog_run(GTK_DIALOG(dialog));
+	gtk_widget_destroy(dialog);
+}
+
+void cb_addvar_addedit (GtkWidget *widget, gpointer data) {
+	GtkBuilder *builder = (GtkBuilder *) data;
+	GtkWidget *dlg = GTK_WIDGET (gtk_builder_get_object (builder, "addvar"));
+	GtkWidget *name = GTK_WIDGET (gtk_builder_get_object (builder, "adddlg_name"));
+
+	GtkWidget *dialog;
+	int result;
+
+	if (Value_Exist((string)gtk_entry_get_text(GTK_ENTRY(name))) == true) {
+		dialog = gtk_message_dialog_new(GTK_WINDOW(dlg),
+				 GTK_DIALOG_DESTROY_WITH_PARENT,
+				 GTK_MESSAGE_QUESTION,
+				 GTK_BUTTONS_YES_NO,
+				 "Are you sure you want to save?");
+		gtk_window_set_title(GTK_WINDOW(dialog), "Question");
+		result = gtk_dialog_run(GTK_DIALOG(dialog));
+		gtk_widget_destroy(dialog);
+		if (result == GTK_RESPONSE_YES)	 gtk_dialog_response(GTK_DIALOG(dlg), GTK_RESPONSE_APPLY);
+	}
+	else {
+		gtk_dialog_response(GTK_DIALOG(dlg), GTK_RESPONSE_APPLY);
+	}
+
+	return;
+};
+
+
+void cb_menu_about(GtkWidget *widget, gpointer data) {
+	GtkBuilder *builder = (GtkBuilder *) data;
+	GtkWidget *dlg = GTK_WIDGET (gtk_builder_get_object (builder, "dlgabout"));
+	GtkWidget *label = GTK_WIDGET (gtk_builder_get_object (builder, "dlgabout_version"));
+	gtk_label_set_text(GTK_LABEL(label), VERSION);
+	gint result = gtk_dialog_run(GTK_DIALOG(dlg));
+	gtk_widget_hide(GTK_WIDGET(dlg));
+
+	return;
+}
+
+
+void cb_about_btnclose(GtkWidget *widget, gpointer data) {
+	GtkBuilder *builder = (GtkBuilder *) data;
+	GtkWidget *dlg = GTK_WIDGET (gtk_builder_get_object (builder, "dlgabout"));
+	gtk_dialog_response(GTK_DIALOG(dlg), GTK_RESPONSE_CLOSE);
+}
+
+void cb_btn_enableall (GtkWidget *widget, gpointer data) {
+	modbus.EnableAll(1);
+	MBData_EnableAll(1);
+};
+
+
+void cb_btn_disableall (GtkWidget *widget, gpointer data) {
+	modbus.EnableAll(0);
+	MBData_EnableAll(0);
+};
+
+
+void cb_btn_clearreq (GtkWidget *widget, gpointer data) {
+	modbus.RequestsClear();
+	MBData_ReqReset ();
+};
+
+
+void cb_btn_enablevalues (GtkWidget *widget, gpointer data) {
+	GtkWidget *vars = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "vars_tv"));
+	GtkTreeIter iter;
+	GtkTreeModel *model;
+	gboolean result;
+	gchar *v_name = NULL;
+	gchar *v_reg = NULL;
+	gchar *v_fc = NULL;
+	gchar *v_type = NULL;
+	int cnt = 0;
+
+	model = gtk_tree_view_get_model(GTK_TREE_VIEW(vars));
+	for (cnt = 0, result = gtk_tree_model_get_iter_first(model, &iter); result == TRUE;
+			result = gtk_tree_model_iter_next(model, &iter), cnt++) {
+		gtk_tree_model_get (model, &iter,
+				VALDATA_COL_NAME, &v_name,
+				VALDATA_COL_FC, &v_fc,
+				VALDATA_COL_REGSTART, &v_reg,
+				VALDATA_COL_TYPE, &v_type,
+				-1);
+
+		if (v_name == NULL) {
+			if (v_fc != NULL) free (v_fc);
+			if (v_reg != NULL) free (v_reg);
+			if (v_type != NULL) free (v_type);
+			break;
+		}
+
+		modbus.Enable(atoi(v_fc), atoi(v_reg), Value_GetSize(v_type), 1);
+		MBData_Enable(atoi(v_fc), atoi(v_reg), Value_GetSize(v_type), 1);
+
+		if (v_name != NULL) free (v_name);
+		if (v_fc != NULL) free (v_fc);
+		if (v_reg != NULL) free (v_reg);
+		if (v_type != NULL) free (v_type);
+	}
+};
+
+
+
+void save_file(std::string fn) {
+	GtkWidget *guiautovalue = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "conf_autoaddvalues"));
+	GtkWidget *vars = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "vars_tv"));
+	GtkTreeIter iter;
+	GtkTreeModel *model;
+	gboolean result;
+	gchar *v_name = NULL;
+	gchar *v_reg = NULL;
+	gchar *v_fc = NULL;
+	gchar *v_type = NULL;
+	gchar *v_value = NULL;
+	gchar *v_sim = NULL;
+	int cnt = 0;
+	JSONParse jp;
+	JSONParse jv;
+	JSONElement je;
+	std::list<JSONElement> values;
+	FILE *f;
+
+	jp.Clear();
+	values.clear();
+	je.Clear();
+	je.type = JSON_T_ARRAY;
+	je.name = "values";
+
+	model = gtk_tree_view_get_model(GTK_TREE_VIEW(vars));
+	for (cnt = 0, result = gtk_tree_model_get_iter_first(model, &iter); result == TRUE;
+			result = gtk_tree_model_iter_next(model, &iter), cnt++) {
+		gtk_tree_model_get (model, &iter,
+				VALDATA_COL_NAME, &v_name,
+				VALDATA_COL_FC, &v_fc,
+				VALDATA_COL_REGSTART, &v_reg,
+				VALDATA_COL_TYPE, &v_type,
+				VALDATA_COL_SIM, &v_sim,
+				VALDATA_COL_VALUE, &v_value,
+				-1);
+
+		if (v_name == NULL) {
+			if (v_fc != NULL) free (v_fc);
+			if (v_reg != NULL) free (v_reg);
+			if (v_type != NULL) free (v_type);
+			if (v_sim != NULL) free (v_sim);
+			if (v_value != NULL) free (v_value);
+			break;
+		}
+
+		jv.Clear();
+		jv.AddObject("name", v_name);
+		jv.AddObject("type", v_type);
+		jv.AddObject("fc", v_fc);
+		jv.AddObject("reg", v_reg);
+		jv.AddObject("sim", v_sim);
+		jv.AddObject("value", v_value);
+
+		if(cnt != 0)
+			je.value += ',';
+		je.value += jv.ToString();
+
+		if (v_name != NULL) free (v_name);
+		if (v_fc != NULL) free (v_fc);
+		if (v_reg != NULL) free (v_reg);
+		if (v_type != NULL) free (v_type);
+		if (v_sim != NULL) free (v_sim);
+		if (v_value != NULL) free (v_value);
+	}
+
+	jp.AddObject(je);
+	jp.AddObject("port", config.GetPort());
+
+	cnt = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(guiautovalue));
+	jp.AddObject("auto_valueadd", cnt);
+
+	f = fopen(fn.c_str(),"w");
+	if (f != NULL) {
+		int err = fprintf (f, "%s\n",jp.ToString().c_str());
+		if (err < 0) printf ("error on writing: %s\n", strerror(errno));
+		fclose (f);
+	}
+	else printf ("error on open (write): %s\n", strerror(errno));
+};
+
+#define FILEBUFFER 0x10000
+void load_file(std::string fn) {
+	GtkWidget *guiautovalue = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "conf_autoaddvalues"));
+	GtkWidget *guiport = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "port_entry"));
+	GuiValue g;
+	int autoadd = 0;
+
+
+	modbus.EnableAll(0);
+	MBData_EnableAll(0);
+	modbus.RequestsClear();
+	MBData_ReqReset ();
+	Value_DelAll();
+	std::string confdata;
+	FILE *f;
+	char buffer[FILEBUFFER];
+	int i;
+	JSONParse json;
+	JSONParse value;
+	std::string temp;
+
+	confdata = "";
+
+	f = fopen(fn.c_str(),"r");
+	if (f != NULL) {
+		while (!feof(f)) {
+			fgets (buffer, FILEBUFFER, f);
+			confdata += buffer;
+		}
+		fclose (f);
+	}
+	else printf ("error on open (read): %s\n", strerror(errno));
+
+	json.Set(confdata);
+
+	if (json.GetValueInt("port", &i)) {
+		config.SetPort(i);
+		gtk_entry_set_text(GTK_ENTRY(guiport), std::to_string(i).c_str());
+	}
+
+	if (json.GetValueInt("auto_valueadd", &i)) {
+		gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(guiautovalue), i);
+	}
+
+
+	for (i = 0; json.GetObjectIdx("values", i, &value); i++) {
+		value.GetValue("name", &g.name);
+		value.GetValue("type", &g.type);
+		value.GetValue("sim", &g.sim);
+		value.GetValue("value", &g.value);
+		value.GetValue("fc", &temp);   g.fc = atoi(temp.c_str());
+		value.GetValue("reg", &temp);   g.reg = atoi(temp.c_str());
+
+		Value_Add(&g);
+	}
+};
+
+
--- a/gui.h
+++ b/gui.h
@ -0,0 +1,88 @@
+///////////////////////////////////////////////////////////////////////////////// 
+//
+// gui.h is part of TestModbus-Server.
+//
+///////////////////////////////////////////////////////////////////////////////// 
+
+#ifndef _GUI_H_
+#define _GUI_H_
+
+#include <gtk/gtk.h>
+#include <gdk/gdk.h>
+#include <glib.h>
+
+#include <string>
+#include <iostream>
+#include <list>
+
+#define BUILDER_FILE "testmodbus-server.ui"
+
+#include "guivalues.h"
+#include "guimodbusdata.h"
+std::string to_hex16 (int v);
+extern uint16_t modbusdata[4][0x10000];
+
+void load_file(std::string fn);
+void save_file(std::string fn);
+void displayerror (string error);
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+// ***********************************************************************
+//
+// main windows call backs
+//
+G_MODULE_EXPORT void cb_window_show  (GtkWidget *widget, gpointer data);
+G_MODULE_EXPORT gboolean cb_window_delete_event (GtkWidget *widget,
+				GdkEvent *event, gpointer data);
+G_MODULE_EXPORT void cb_menu_new (GtkWidget *widget, gpointer   data);
+G_MODULE_EXPORT void cb_menu_open (GtkWidget *widget, gpointer   data);
+G_MODULE_EXPORT void cb_menu_save (GtkWidget *widget, gpointer   data);
+G_MODULE_EXPORT void cb_menu_saveas (GtkWidget *widget, gpointer   data);
+G_MODULE_EXPORT void cb_menu_quit (GtkWidget *widget, gpointer   data);
+G_MODULE_EXPORT void cb_menu_about (GtkWidget *widget, gpointer data);
+
+//
+// About Dialog
+G_MODULE_EXPORT void cb_about_btnclose(GtkWidget *widget, gpointer data);
+
+//
+// Variable Buttons
+G_MODULE_EXPORT void cb_btn_addvar (GtkWidget *widget, gpointer data);
+G_MODULE_EXPORT void cb_btn_editvar (GtkWidget *widget, gpointer data);
+G_MODULE_EXPORT void cb_btn_delvar (GtkWidget *widget, gpointer data);
+
+//
+// Add Variable Dialog
+G_MODULE_EXPORT void cb_addvar_close (GtkWidget *widget, gpointer data);
+G_MODULE_EXPORT void cb_addvar_addedit (GtkWidget *widget, gpointer data);
+
+//
+// Register Buttons
+G_MODULE_EXPORT void cb_btn_enableall (GtkWidget *widget, gpointer data);
+G_MODULE_EXPORT void cb_btn_disableall (GtkWidget *widget, gpointer data);
+G_MODULE_EXPORT void cb_btn_enablevalues (GtkWidget *widget, gpointer data);
+G_MODULE_EXPORT void cb_btn_clearreq (GtkWidget *widget, gpointer data);
+
+
+//
+// Port Entry Field and Connect Buttons
+//
+G_MODULE_EXPORT void cb_port_enter (GtkWidget *widget, gpointer data);
+G_MODULE_EXPORT void cb_btn_start (GtkWidget *widget, gpointer data);
+G_MODULE_EXPORT gboolean cb_thread_network_data_add (gpointer data);
+G_MODULE_EXPORT gboolean cb_thread_network_text_add (gpointer data);
+G_MODULE_EXPORT gboolean cb_thread_status (gpointer data);
+
+G_MODULE_EXPORT gboolean modbus_callback (gpointer data);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif
--- a/guimodbusdata.cc
+++ b/guimodbusdata.cc
@ -0,0 +1,281 @@
+///////////////////////////////////////////////////////////////////////////////// 
+//
+// guimodbusdata.cc is part of TestModbus-Server.
+//
+///////////////////////////////////////////////////////////////////////////////// 
+
+//
+//
+// show all modbus registers and the value
+//
+//
+
+#include "gui.h"
+#include "guimodbusdata.h"
+#include "modbus.h"
+
+extern Modbus modbus;
+
+extern GtkBuilder *_builder_;			// work around for threads
+void mbdata_enabletoggled_cb(GtkCellRendererToggle *cellrenderer, char *path, gpointer data);
+
+#define MAXREG 0x10000
+#define STEPREG 1000
+GtkTreeModel *MBData_create_with_data() {
+	GtkTreeStore *store;
+	GtkTreeIter iter, toplevel, secondlevel;
+	ModbusRegister r;
+	string txt =  "";
+	string regname, regname1, regname2;
+	int regnum, fc;
+
+	store = gtk_tree_store_new (MBDATA_COLCOUNT, G_TYPE_STRING, G_TYPE_BOOLEAN, G_TYPE_BOOLEAN, G_TYPE_BOOLEAN, G_TYPE_STRING);
+	// fill in FC1..FC4
+	for (fc = 1; fc <= 4; fc++) {
+		regname = "FC" + std::to_string(fc);
+		gtk_tree_store_append (store, &toplevel, NULL);
+		gtk_tree_store_set (store, &toplevel,
+					MBDATA_COL_FCREG, regname.c_str(),
+					-1);
+		
+		for (regnum = 0; regnum < MAXREG; regnum++) {
+			if (regnum % STEPREG == 0) {
+  				regname1 = "FC" + std::to_string(fc) + " " +  std::to_string(regnum) + ".." + std::to_string(regnum+STEPREG);
+				gtk_tree_store_append (store, &secondlevel, &toplevel);
+				gtk_tree_store_set (store, &secondlevel, MBDATA_COL_FCREG, regname1.c_str(),-1);
+			}
+			
+			modbus.GetRegister(fc, regnum, &r);
+			regname2 = "FC" + std::to_string(fc) + " " +  std::to_string(regnum);
+			if (fc < 3) {
+				if (r.value == 0) txt = "false";
+				else txt = "true";
+			}
+			else
+				txt = to_hex16(r.value) + " (" +std::to_string(r.value)+")";
+			gtk_tree_store_append (store, &iter, &secondlevel);
+			gtk_tree_store_set (store, &iter,
+					MBDATA_COL_FCREG, regname2.c_str(),
+					MBDATA_COL_REQREAD, r.requested & 1,
+					MBDATA_COL_REQWRITE, r.requested & 2,
+					MBDATA_COL_ENABLED, (r.enabled),
+					MBDATA_COL_VALUE, txt.c_str(),
+					-1);
+		}
+	}
+
+	return GTK_TREE_MODEL (store);
+};
+
+
+void mbdata_show(GtkWidget *widget, gpointer data) {
+	GtkWidget *view = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(data), "regs_tv"));
+	GtkCellRenderer *renderer;
+	GtkTreeModel *model;
+
+	//
+	renderer = gtk_cell_renderer_text_new ();
+	gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (view),
+											   -1,
+											   "FC",
+											   renderer,
+											   "text", MBDATA_COL_FCREG,
+											   NULL);
+	renderer = gtk_cell_renderer_toggle_new ();
+	gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (view),
+											   -1,
+											   "Req. Read",
+											   renderer,
+											   "active", MBDATA_COL_REQREAD,
+											   NULL);
+	renderer = gtk_cell_renderer_toggle_new ();
+	gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (view),
+											   -1,
+											   "Req. Write",
+											   renderer,
+											   "active", MBDATA_COL_REQWRITE,
+											   NULL);
+	renderer = gtk_cell_renderer_toggle_new ();
+	gtk_cell_renderer_toggle_set_activatable (GTK_CELL_RENDERER_TOGGLE(renderer), true);
+	g_signal_connect (G_OBJECT (renderer), "toggled",
+                      G_CALLBACK (mbdata_enabletoggled_cb),
+					  NULL);
+
+	gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (view),
+											   -1,
+											   "Enabled",
+											   renderer,
+											   "active", MBDATA_COL_ENABLED,
+											   NULL);
+	renderer = gtk_cell_renderer_text_new ();
+	gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (view),
+											   -1,
+											   "Value",
+											   renderer,
+											   "text", MBDATA_COL_VALUE,
+											   NULL);
+
+	model = MBData_create_with_data();
+	gtk_tree_view_set_model (GTK_TREE_VIEW (view), model);
+
+	g_object_unref(model);
+};
+
+
+void mbdata_enabletoggled_cb(GtkCellRendererToggle *cellrenderer, char *path, gpointer data) {
+	GtkWidget *mbdata = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "regs_tv"));
+	GtkTreeIter iter;
+	GtkTreeModel *model;
+	int enabled;
+	char *fcreg = NULL;
+	int pathint[3];
+	int reg;
+	int fc;
+
+	// retrieve fc and register from path, return if invalid
+	for (fc = 0; fc < 3; fc++) pathint[fc] = -1;
+	sscanf (path, "%d:%d:%d", pathint, pathint+1, pathint+2);
+	fc = pathint[0]+1;
+	reg = pathint[1]*STEPREG+pathint[2];
+	if (pathint[2] == -1) return;
+
+	// read current enable setting, inverse, set to modbus object and set in treeview
+	model = gtk_tree_view_get_model(GTK_TREE_VIEW(mbdata));
+	if (gtk_tree_model_get_iter_from_string(model, &iter, path) == true) {
+		gtk_tree_model_get(model, &iter,
+				MBDATA_COL_FCREG, &fcreg,
+				MBDATA_COL_ENABLED, &enabled,
+				-1);
+		if (fcreg != NULL) {
+			if (enabled == 0) enabled = 1;
+			else enabled = 0;
+			gtk_tree_store_set(GTK_TREE_STORE(model), &iter,
+				MBDATA_COL_ENABLED, enabled,
+				-1);
+			modbus.Enable(fc, reg, 1, enabled);
+			g_free (fcreg);
+			fcreg = NULL;
+		}
+	}
+};
+
+
+
+// walk throught the registers and draw them.. if unknown//not yet set check for auto add
+void MBData_ChangeRegs (int fc, int regstart, int count, ModbusRegister *r) {
+	GtkWidget *mbdata = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "regs_tv"));
+	GtkTreeIter iter;
+	GtkTreeModel *model;
+	int i,j;
+	gchar *v_fcreg = NULL;
+	string path;
+	char value[16] = "0000";
+	char hex[] = "0123456789ABCDEF";
+
+	model = gtk_tree_view_get_model(GTK_TREE_VIEW(mbdata));
+
+	for (i = 0; regstart < MAXREG && i < count; i++, regstart++) {
+		for (j = 0; j < 4; j++)	value[3-j] = hex[(r[i].value >> j)%16];
+
+		path = std::to_string(fc-1) + ":" + std::to_string(regstart / STEPREG) + ":" + std::to_string(regstart % STEPREG);
+		// printf ("fc:%d  reg:%d  val:%d  enabled:%d  requested:%d  path:%s\n", fc, regstart, r[i].value, r[i].enabled, r[i].requested, path.c_str());
+		if (gtk_tree_model_get_iter_from_string(model, &iter, path.c_str()) == true) {
+			gtk_tree_model_get (model, &iter,
+					MBDATA_COL_FCREG, &v_fcreg,
+					-1);
+			if (v_fcreg == NULL) break;
+
+			if (r[i].enabled) {
+				if (fc == 1)
+					memcpy (&modbusdata[0][regstart], &r[i].value, 2);
+				if (fc == 2)
+					memcpy (&modbusdata[1][regstart], &r[i].value, 2);
+				if (fc == 4)
+					memcpy (&modbusdata[3][regstart], &r[i].value, 2);
+				if (fc == 3 || fc == 6 || fc == 16)
+					memcpy (&modbusdata[2][regstart], &r[i].value, 2);
+			}
+
+			if (fc == 1 || fc == 2) {
+				gtk_tree_store_set(GTK_TREE_STORE(model), &iter,
+						MBDATA_COL_FCREG, v_fcreg,
+						MBDATA_COL_REQREAD, (r[i].requested & 1),
+						MBDATA_COL_REQWRITE, (r[i].requested & 2),
+						MBDATA_COL_ENABLED, r[i].enabled,
+						MBDATA_COL_VALUE, r[i].value ? "         true" : "false",
+						-1);
+			}
+			if (fc == 3 || fc == 4) {
+				gtk_tree_store_set(GTK_TREE_STORE(model), &iter,
+						MBDATA_COL_FCREG, v_fcreg,
+						MBDATA_COL_REQREAD, (r[i].requested & 1),
+						MBDATA_COL_REQWRITE, (r[i].requested & 2),
+						MBDATA_COL_ENABLED, r[i].enabled,
+						MBDATA_COL_VALUE, ((string)value + " (" + std::to_string(r[i].value) + ")").c_str(),
+						-1);
+			}
+			g_free(v_fcreg);
+		}
+	}
+};
+
+
+void MBData_Enable (int fc, int regstart, int count, int onoff) {
+	GtkWidget *mbdata = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "regs_tv"));
+	GtkTreeIter iter;
+	GtkTreeModel *model;
+	int i;
+	string path;
+
+	model = gtk_tree_view_get_model(GTK_TREE_VIEW(mbdata));
+
+	for (i = 0; regstart < MAXREG && i < count; i++, regstart++) {
+		path = std::to_string(fc-1) + ":" + std::to_string(regstart / STEPREG) + ":" + std::to_string(regstart % STEPREG);
+		if (gtk_tree_model_get_iter_from_string(model, &iter, path.c_str()) == true) {
+			gtk_tree_store_set(GTK_TREE_STORE(model), &iter,
+					MBDATA_COL_ENABLED, onoff,
+					-1);
+		}
+	}
+};
+
+
+
+void MBData_EnableAll (int onoff) {
+	GtkWidget *mbdata = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "regs_tv"));
+	GtkTreeIter iter;
+	GtkTreeModel *model;
+	int reg, fc;
+	string path;
+
+	model = gtk_tree_view_get_model(GTK_TREE_VIEW(mbdata));
+	for (fc = 1; fc < 5; fc++) for (reg = 0; reg < 0x10000; reg++) {
+		path = std::to_string(fc-1) + ":" + std::to_string(reg / STEPREG) + ":" + std::to_string(reg % STEPREG);
+		if (gtk_tree_model_get_iter_from_string(model, &iter, path.c_str()) == true) {
+			gtk_tree_store_set(GTK_TREE_STORE(model), &iter,
+					MBDATA_COL_ENABLED, onoff,
+					-1);
+		}
+	}
+};
+
+
+void MBData_ReqReset () {
+	GtkWidget *mbdata = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "regs_tv"));
+	GtkTreeIter iter;
+	GtkTreeModel *model;
+	int reg, fc;
+	string path;
+
+	model = gtk_tree_view_get_model(GTK_TREE_VIEW(mbdata));
+	for (fc = 1; fc < 5; fc++) for (reg = 0; reg < 0x10000; reg++) {
+		path = std::to_string(fc-1) + ":" + std::to_string(reg / STEPREG) + ":" + std::to_string(reg % STEPREG);
+		if (gtk_tree_model_get_iter_from_string(model, &iter, path.c_str()) == true) {
+			gtk_tree_store_set(GTK_TREE_STORE(model), &iter,
+					MBDATA_COL_REQREAD, 0,
+					MBDATA_COL_REQWRITE, 0,
+					-1);
+		}
+	}
+};
+
--- a/guimodbusdata.h
+++ b/guimodbusdata.h
@ -0,0 +1,39 @@
+///////////////////////////////////////////////////////////////////////////////// 
+//
+// guimodbusdata.h is part of TestModbus-Server.
+// 
+///////////////////////////////////////////////////////////////////////////////// 
+
+#ifndef _GUIMODBUSDATA_H_
+#define _GUIMODBUSDATA_H_
+
+#include "gui.h"
+#include "modbus.h"
+#include "guivalues.h"
+
+enum {
+	MBDATA_COL_FCREG = 0,
+	MBDATA_COL_REQREAD,
+	MBDATA_COL_REQWRITE,
+	MBDATA_COL_ENABLED,
+	MBDATA_COL_VALUE,
+	MBDATA_COLCOUNT
+};
+
+GtkTreeModel *MBData_create_with_data();
+void MBData_ChangeRegs (int fc, int regstart, int count, ModbusRegister *r);
+void MBData_Enable (int fc, int regstart, int count, int onoff);
+void MBData_EnableAll (int onoff);
+void MBData_ReqReset ();
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+G_MODULE_EXPORT void mbdata_show(GtkWidget *widget, gpointer data);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
--- a/guivalues.cc
+++ b/guivalues.cc
@ -0,0 +1,554 @@
+///////////////////////////////////////////////////////////////////////////////// 
+//
+// guivalues.cc is part of TestModbus-Server.
+//
+///////////////////////////////////////////////////////////////////////////////// 
+
+//
+//
+// show all variables and the value
+//
+//
+
+#include <sys/time.h>
+#include <math.h>
+
+#include "gui.h"
+#include "config.h"
+#include "mbsconfig.h"
+#include "modbus.h"
+#include "guivalues.h"
+
+
+extern GtkBuilder *_builder_;			// work around for threads
+
+GuiValue::GuiValue() {
+	sim = "";
+	name = "";
+	type = "";
+	fc = 0;
+	reg = 0;
+};
+
+
+GuiValue::~GuiValue() {
+
+};
+
+
+// walk throught the registers and draw them.. if unknown//not yet set check for auto add
+void Values_ChangeRegs (int fc, int regstart, int count, ModbusRegister *r) {
+	int autoadd = 0;
+	int reg, idx;
+	GtkWidget *cb_autovalue = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "conf_autoaddvalues"));
+	GtkWidget *vars = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "vars_tv"));
+	GtkTreeIter iter;
+	GtkTreeModel *model;
+	gboolean result;
+	gchar *v_name = NULL;
+	gchar *v_fc = NULL;
+	gchar *v_reg = NULL;
+	gchar *v_type = NULL;
+	gchar *v_sim = NULL;
+	int found = 0;
+	int regsize = 1;
+
+
+	model = gtk_tree_view_get_model(GTK_TREE_VIEW(vars));
+	autoadd = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(cb_autovalue));
+
+	for (idx = 0, reg = regstart; idx < count; reg++, idx++) {
+		for (found = 0, result = gtk_tree_model_get_iter_first(model, &iter); found == 0 && result == TRUE;
+				result = gtk_tree_model_iter_next(model, &iter)) {
+			gtk_tree_model_get (model, &iter,
+					VALDATA_COL_NAME, &v_name,
+					VALDATA_COL_FC, &v_fc,
+					VALDATA_COL_REGSTART, &v_reg,
+					VALDATA_COL_TYPE, &v_type,
+					VALDATA_COL_SIM, &v_sim,
+					-1);
+
+			if (v_name == NULL || v_reg == NULL || v_fc == NULL || v_type == NULL) {
+				if (v_name != NULL) g_free(v_name);
+				if (v_reg != NULL) g_free(v_reg);
+				if (v_fc != NULL) g_free(v_fc);
+				if (v_type != NULL) g_free(v_type);
+				if (v_sim != NULL) g_free(v_sim);
+				break;
+			}
+
+			regsize = Value_GetSize(v_type);
+			if (atoi(v_fc) == fc && reg >= atoi(v_reg) && reg < (atoi(v_reg) + regsize)) {
+				found = 1;
+				GuiValue v;
+				v.name = v_name;
+				v.fc = atoi(v_fc);
+				v.reg = atoi(v_reg);
+				v.type = v_type;
+				v.sim = v_sim;
+				Value_Set (&v);
+			}
+
+			g_free(v_name);
+			g_free(v_fc);
+			g_free(v_reg);
+			g_free(v_sim);
+			g_free(v_type);
+		}
+
+		if (autoadd && found == 0) {
+			GuiValue v;
+			v.name = "_auto_FC" + std::to_string(fc) + "_REG_" + std::to_string (reg);
+			v.sim = "NONE";
+			v.fc = fc;
+			v.reg = reg;
+			if (v.fc == 1 || v.fc == 2) v.type = "BOOL";
+			else v.type = "WORD";
+			Value_Set (&v);
+		}
+	}
+};
+
+
+std::string findparm(std::string t, std::string parm) {
+	std::string res = "";
+	string::size_type i = t.find(parm+"=");
+	string::size_type j,k;
+
+	if (i != string::npos) {
+		res = t.substr (i, string::npos);
+		j = res.find("=");
+		k = res.find(";");
+		if (k != string::npos) k = k -j -1;
+		if (j != string::npos) res = res.substr(j+1, k);
+	}
+
+	return res;
+}
+
+
+int Value_Simulation(GuiValue *v) {
+	struct timeval tv;
+	string s;
+
+	gettimeofday (&tv, NULL);
+	string sim = v->sim.substr(0, v->sim.find(";"));
+
+	if (sim.compare("PULSE") == 0) {
+		int ton = 10;
+		s = findparm(v->sim, "ton");
+		if(s.length()>0) ton = atoi(s.c_str());
+
+		int toff = 50;
+		s = findparm(v->sim, "toff");
+		if(s.length()>0) toff = atoi(s.c_str());
+
+		int td = ton +toff;
+		td = tv.tv_sec % td;
+		if (td <= ton) v->value = "true";
+		else v->value = "false";
+
+		return 1;
+	}
+	else if (sim.compare("SIN") == 0) {
+		int td = 60;
+		s = findparm(v->sim, "t");
+		if(s.length()>0) td = atoi(s.c_str());
+
+		float min = -100;
+		s = findparm(v->sim, "min");
+		if(s.length()>0) min = atof(s.c_str());
+
+		float max = 100;
+		s = findparm(v->sim, "max");
+		if(s.length()>0) max = atof(s.c_str());
+
+		float t = ((float)(tv.tv_sec % td)) + (((float)tv.tv_usec) / 1000000);
+		t = 4.0 * t * M_PI / td;
+		v->value = std::to_string((0.5*(max-min)*sin(t))+(min+max)*0.5);
+
+		return 1;
+	}
+	else if (sim.compare("SAW") == 0) {
+		int td = 60;
+		s = findparm(v->sim, "t");
+		if(s.length()>0) td = atoi(s.c_str());
+
+		float min = -100;
+		s = findparm(v->sim, "min");
+		if(s.length()>0) min = atof(s.c_str());
+
+		float max = 100;
+		s = findparm(v->sim, "max");
+		if(s.length()>0) max = atof(s.c_str());
+
+		float t = ((float)(tv.tv_sec % td)) + (((float)tv.tv_usec) / 1000000);
+		t = t / td;
+		v->value = std::to_string((max-min)*t+min);
+
+		return 1;
+	}
+
+	return 0;
+};
+
+
+gboolean Value_Loop(gpointer data) {
+	GtkWidget *vars = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "vars_tv"));
+	GtkTreeIter iter;
+	GtkTreeModel *model;
+	gboolean result;
+	gchar *v_name = NULL;
+	gchar *v_type = NULL;
+	gchar *v_value = NULL;
+	gchar *v_sim = NULL;
+	gchar *v_fc = NULL;
+	gchar *v_reg = NULL;
+	GuiValue v;
+	int changed = 0;
+
+	model = gtk_tree_view_get_model(GTK_TREE_VIEW(vars));
+	for (result = gtk_tree_model_get_iter_first(model, &iter); result == TRUE;
+			result = gtk_tree_model_iter_next(model, &iter)) {
+		gtk_tree_model_get (model, &iter,
+				VALDATA_COL_NAME, &v_name,
+				VALDATA_COL_TYPE, &v_type,
+				VALDATA_COL_SIM, &v_sim,
+				VALDATA_COL_VALUE, &v_value,
+				VALDATA_COL_FC, &v_fc,
+				VALDATA_COL_REGSTART, &v_reg,
+				-1);
+		if (v_name == NULL) break;
+
+		GuiValue v;
+		v.name = v_name;
+		v.fc = atoi(v_fc);
+		v.reg = atoi(v_reg);
+		v.type = v_type;
+		v.sim = v_sim;
+		Value_Set (&v);
+
+		changed = Value_Simulation(&v);
+		if (changed) {
+			uint16_t regvals[4];
+			int regstowrite = 1;
+			if (Value_SetValue(v.value, v.type, v.fc, &regstowrite, regvals)) {
+				modbus.SetRegValue(v.fc, v.reg, regstowrite, (uint16_t*)regvals);
+			}
+		}
+
+		g_free(v_name);
+		g_free(v_type);
+		g_free(v_sim);
+		g_free(v_value);
+		g_free(v_reg);
+		g_free(v_fc);
+	}
+
+	return TRUE;	// continue timer
+}
+
+void Value_Set(GuiValue *g) {
+	GtkWidget *vars = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "vars_tv"));
+	GtkTreeIter iter;
+	GtkTreeModel *model;
+	gboolean result;
+	gchar *v_name = NULL;
+	int changed = 0;
+
+	model = gtk_tree_view_get_model(GTK_TREE_VIEW(vars));
+	for (result = gtk_tree_model_get_iter_first(model, &iter); result == TRUE && changed == 0;
+			result = gtk_tree_model_iter_next(model, &iter)) {
+		gtk_tree_model_get (model, &iter,
+				VALDATA_COL_NAME, &v_name,
+				-1);
+		if (v_name == NULL) break;
+		if (strcmp(v_name, g->name.c_str()) == 0) {
+			Value_ModStore(model, &iter, g);
+			changed = 1;
+		}
+		g_free(v_name);
+	}
+
+	if (changed == 0)
+		Value_Add(g);
+}
+
+
+int Value_GetSize(std::string type) {
+	if (type.compare("WORD") == 0) 			return 1;
+	if (type.compare("DWORD") == 0) 		return 2;
+	if (type.compare("FLOAT") == 0)  		return 2;
+	if (type.compare("DWORD_SWAP") == 0)  	return 2;
+	if (type.compare("FLOAT_SWAP") == 0)  	return 2;
+
+	return 1;
+}
+
+
+void Value_Add(GuiValue *g) {
+	GtkWidget *vars = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "vars_tv"));
+	GtkTreeIter iter;
+	GtkTreeModel *model;
+	int count;
+
+	model = gtk_tree_view_get_model(GTK_TREE_VIEW(vars));
+	gtk_list_store_append (GTK_LIST_STORE(model), &iter);
+	Value_ModStore(model, &iter, g);
+
+	count = Value_GetSize(g->type);
+	modbus.Enable(g->fc, g->reg, count, 1);
+	MBData_Enable(g->fc, g->reg, count, 1);
+}
+
+
+void Value_ModStore(GtkTreeModel *model, GtkTreeIter *iter, GuiValue *g) {
+	g->value = Value_GetValue(g->fc, g->reg, g->type);
+	gtk_list_store_set(GTK_LIST_STORE(model), iter,
+		VALDATA_COL_NAME, g->name.c_str(),
+		VALDATA_COL_FC, std::to_string(g->fc).c_str(),
+		VALDATA_COL_REGSTART, std::to_string(g->reg).c_str(),
+		VALDATA_COL_TYPE, g->type.c_str(),
+		VALDATA_COL_VALUE, Value_GetValue(g->fc, g->reg, g->type).c_str(),
+		VALDATA_COL_SIM, g->sim.c_str(),
+		-1);
+
+	//	for (int i = 0; i < 10; i++) {
+	//		float *f = (float *)&modbusdata[2][i];
+	//		printf ("%f  ", *f);
+	//	}
+	//	printf ("\n");
+};
+
+
+///////////////////////////////////////////////////
+// return valuze as string
+std::string Value_GetValue(int fc, int reg, string type) {
+	std::string result = "";
+
+	if (fc == 1 || fc == 2) {
+		if (modbusdata[fc-1][reg]) result = "true";
+		else result = "false";
+	}
+	else if (fc == 3 || fc == 4) {
+		if (type.compare ("WORD") == 0) result = std::to_string(modbusdata[fc-1][reg]);
+		else if (type.compare ("FLOAT") == 0) {
+			uint8_t data[4];
+			float *f = (float*)&data;
+
+			memcpy (data, &modbusdata[fc-1][reg], 2);
+			memcpy (data+2, &modbusdata[fc-1][reg+1], 2);
+
+			result = std::to_string(*f);
+		}
+		else if (type.compare ("FLOAT_SWAP") == 0) {
+			uint8_t data[4];
+			float *f = (float*)&data;
+
+			memcpy (data, &modbusdata[fc-1][reg+1], 2);
+			memcpy (data+2, &modbusdata[fc-1][reg], 2);
+
+			result = std::to_string((double)*f);
+		}
+		else if (type.compare ("DWORD") == 0) {
+			uint8_t data[4];
+			uint32_t *f = (uint32_t*)&data;
+
+			memcpy (data, &modbusdata[fc-1][reg], 2);
+			memcpy (data+2, &modbusdata[fc-1][reg+1], 2);
+
+			result = std::to_string(*f);
+		}
+		else if (type.compare ("DWORD_SWAP") == 0) {
+			uint8_t data[4];
+			uint32_t *f = (uint32_t*)&data;
+
+			memcpy (data, &modbusdata[fc-1][reg+1], 2);
+			memcpy (data+2, &modbusdata[fc-1][reg], 2);
+
+			result = std::to_string(*f);
+		}
+		else if (type.compare ("BOOL") == 0) {
+			int c;
+
+			for (result = "", c = 0; c < 16; c++) {
+				if (modbusdata[fc-1][reg] & (1<<c)) result = "1" + result;
+				else result = "0" + result;
+			}
+		}
+	}
+	else {
+		printf ("%s:%d Some Error fc:%d\n", __FILE__, __LINE__, fc);
+	}
+
+	return result;
+}
+
+
+int Value_SetValue(string value, string type, int fc, int *regcnt, uint16_t *regvalues) {
+	uint8_t data[4];
+
+	if (fc == 1 || fc == 2) {
+		*regcnt = 1;
+		if (value.compare("false") == 0 || value.compare("0") == 0)
+			*regvalues = 0;
+		else *regvalues = 1;
+	}
+
+	else {
+		if (type.compare("FLOAT") == 0) {
+			float *f = (float*)data;
+			*f = (float) atof (value.c_str());
+			memcpy (regvalues, data, 2);
+			memcpy (regvalues+1, data+2, 2);
+			*regcnt = 2;
+		}
+		else if (type.compare("FLOAT_SWAP") == 0) {
+			float *f = (float*)data;
+			*f = (float) atof (value.c_str());
+			memcpy (regvalues+1, data, 2);
+			memcpy (regvalues, data+2, 2);
+			*regcnt = 2;
+		}
+		else if (type.compare("WORD") == 0) {
+			uint16_t i16;
+			i16 = (uint16_t) atoi (value.c_str());
+			memcpy (regvalues, &i16, 2);
+			*regcnt = 1;
+		}
+	}
+
+	return 1;
+}
+
+
+//////////////////////////////////////////////////
+// delete Value from list
+void Value_Del(string name) {
+	gboolean res = false;
+	GtkWidget *vars = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "vars_tv"));
+	GtkTreeIter iter;
+	GtkTreeModel *model;
+	gboolean result;
+	gchar *v_name = NULL;
+
+	printf ("%s:%d Delete: %s\n", __FILE__, __LINE__, name.c_str());
+
+	model = gtk_tree_view_get_model(GTK_TREE_VIEW(vars));
+	for (result = gtk_tree_model_get_iter_first(model, &iter); result == true && res == false;
+			result = gtk_tree_model_iter_next(model, &iter)) {
+		gtk_tree_model_get (model, &iter,
+				VALDATA_COL_NAME, &v_name,
+				-1);
+		if (v_name == NULL) break;
+		if (strcmp(v_name, name.c_str()) == 0) {
+			printf ("Found\n");
+			gtk_list_store_remove(GTK_LIST_STORE(model), &iter);
+			res = true;
+		}
+		g_free(v_name);
+	}
+
+	return;
+}
+
+
+//////////////////////////////////////////////////
+// delete all values
+void Value_DelAll() {
+	GtkWidget *vars = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "vars_tv"));
+	GtkTreeModel *model;
+
+	printf ("%s:%d Delete All\n", __FILE__, __LINE__);
+
+	model = gtk_tree_view_get_model(GTK_TREE_VIEW(vars));
+	gtk_list_store_clear(GTK_LIST_STORE(model));
+
+	return;
+}
+
+
+//////////////////////////////////////////////////
+// check if Value is already set
+gboolean Value_Exist(std::string name) {
+	gboolean res = false;
+	GtkWidget *vars = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "vars_tv"));
+	GtkTreeIter iter;
+	GtkTreeModel *model;
+	gboolean result;
+	gchar *v_name = NULL;
+
+	model = gtk_tree_view_get_model(GTK_TREE_VIEW(vars));
+	for (result = gtk_tree_model_get_iter_first(model, &iter); result == true && res == true;
+			result = gtk_tree_model_iter_next(model, &iter)) {
+		gtk_tree_model_get (model, &iter,
+				VALDATA_COL_NAME, &v_name,
+				-1);
+		if (v_name == NULL) break;
+		if (strcmp(v_name, name.c_str()) == 0) {
+			res = true;
+		}
+		g_free(v_name);
+	}
+
+	return res;
+}
+
+
+
+void valdata_show(GtkWidget *widget, gpointer data) {
+	GtkWidget *view = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(data), "vars_tv"));
+	GtkCellRenderer *renderer;
+	GtkTreeModel *model;
+
+	//
+	renderer = gtk_cell_renderer_text_new ();
+	gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (view),
+											   -1,
+											   "Name",
+											   renderer,
+											   "text", VALDATA_COL_NAME,
+											   NULL);
+	renderer = gtk_cell_renderer_text_new ();
+	gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (view),
+											   -1,
+											   "FC",
+											   renderer,
+											   "text", VALDATA_COL_FC,
+											   NULL);
+	renderer = gtk_cell_renderer_text_new ();
+	gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (view),
+											   -1,
+											   "Register",
+											   renderer,
+											   "text", VALDATA_COL_REGSTART,
+											   NULL);
+	renderer = gtk_cell_renderer_text_new ();
+	gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (view),
+											   -1,
+											   "Type",
+											   renderer,
+											   "text", VALDATA_COL_TYPE,
+											   NULL);
+	renderer = gtk_cell_renderer_text_new ();
+	gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (view),
+											   -1,
+											   "Simulation",
+											   renderer,
+											   "text", VALDATA_COL_SIM,
+											   NULL);
+	renderer = gtk_cell_renderer_text_new ();
+	gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (view),
+											   -1,
+											   "Value",
+											   renderer,
+											   "text", VALDATA_COL_VALUE,
+											   NULL);
+
+
+	model = GTK_TREE_MODEL(gtk_list_store_new (VALDATA_COLCOUNT, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING));
+	gtk_tree_view_set_model (GTK_TREE_VIEW (view), model);
+
+	g_object_unref(model);
+};
+
--- a/guivalues.h
+++ b/guivalues.h
@ -0,0 +1,61 @@
+///////////////////////////////////////////////////////////////////////////////// 
+//
+// guivalues.h is part of TestModbus-Server.
+//
+///////////////////////////////////////////////////////////////////////////////// 
+
+#ifndef _GUIVALUE_H_
+#define _GUIVALUE_H_
+
+#include "gui.h"
+#include "modbus.h"
+#include <string>
+
+enum {
+	VALDATA_COL_NAME = 0,
+	VALDATA_COL_FC,
+	VALDATA_COL_REGSTART,
+	VALDATA_COL_TYPE,
+	VALDATA_COL_SIM,
+	VALDATA_COL_VALUE,
+	VALDATA_COLCOUNT
+};
+
+
+class GuiValue {
+public:
+	GuiValue ();
+	~GuiValue ();
+	std::string name;
+	std::string type;
+	std::string sim;
+	std::string value;
+	int reg;
+	int fc;
+};
+
+
+void Values_ChangeRegs (int fc, int regstart, int count, ModbusRegister *r);
+void Value_Set(GuiValue *v);
+void Value_Add(GuiValue *v);
+void Value_Del(std::string name);
+void Value_DelAll();
+void Value_ModStore(GtkTreeModel *model, GtkTreeIter *iter, GuiValue *g);
+int Value_GetSize(std::string type);
+std::string Value_GetValue(int fc, int reg, string type);
+int Value_SetValue(string value, string type, int fc, int *registers, uint16_t *regs);
+gboolean Value_Exist (std::string name);
+gboolean Value_Loop(gpointer data);
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+G_MODULE_EXPORT void valdata_show(GtkWidget *widget, gpointer data);
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif
--- a/json.cc
+++ b/json.cc
@ -0,0 +1,494 @@
+///////////////////////////////////////////////////////////////////////////////// 
+//
+// json.cc is part of TestModbus-Server.
+//
+///////////////////////////////////////////////////////////////////////////////// 
+
+#include <list>
+#include <string>
+#include <string.h>
+
+#include "json.h"
+
+/***********************************************************************
+ ***********************************************************************
+ *
+ * JSONParse
+ *
+ ***********************************************************************
+ ***********************************************************************
+ */
+
+enum {
+	STEP_NONE = 0,
+	STEP_STARTNAME,
+	STEP_NAME,
+	STEP_STARTVALUE,
+	STEP_VALUE,
+	STEP_END
+};
+
+
+/////////////////////////////////////////////////////////
+//
+// clear out all data
+//
+void JSONParse::Clear() {
+	jsondata = "";
+	names.clear();
+}
+
+/////////////////////////////////////////////////////////
+//
+// read every element and keep only this in memory.
+//
+int JSONParse::Set(string json) {
+	int i;
+	int step;
+	int level;
+	bool ignorenext;
+
+	JSONElement jelement;
+
+	Clear();
+
+	// find start and read until end
+	for (step = STEP_NONE, i = 0, ignorenext = false; i < json.length(); i++) {
+		// need to copy next character
+//		debug (0, "JSONParse: step:%d i:%d name:'%s' value:'%s'", step, i, jelement.name.c_str(), jelement.value.c_str());
+		if (ignorenext) {
+			ignorenext = false;
+			if (step == STEP_NAME)  jelement.name += json[i];
+			if (step == STEP_VALUE) jelement.value += json[i];
+		}
+
+		// searching for startname
+		else if (step == STEP_NONE) {
+			if (json[i] == '{') {
+				step = STEP_STARTNAME;
+				continue;
+			}
+		}
+
+		// searching for startname
+		else if (step == STEP_STARTNAME) {
+			if (json[i] == '"') {
+				step = STEP_NAME;
+				continue;
+			}
+		}
+
+		// copy name
+		else if (step == STEP_NAME) {
+			if (json[i] == '"') {
+				step = STEP_STARTVALUE;
+				continue;
+			}
+			else {
+				jelement.name += json[i];
+				continue;
+			}
+		}
+
+		// searching for startvalue
+		else if (step == STEP_STARTVALUE) {
+			if (json[i] == '"') {
+				step = STEP_VALUE;
+				jelement.type = JSON_T_STRING;
+				continue;
+			}
+			if (json[i] == '{') {
+				step = STEP_VALUE;
+				level = 0;
+				jelement.type = JSON_T_OBJECT;
+				jelement.value = "{";
+				continue;
+			}
+			if (json[i] == '[') {
+				step = STEP_VALUE;
+				level = 0;
+				jelement.type = JSON_T_ARRAY;
+				jelement.value = "[";
+				continue;
+			}
+			if ((json[i] >= '0' && json[i] <= '9') ||
+				(json[i] == '+' || json[i] == '-')) {
+				step = STEP_VALUE;
+				level = 0;
+				jelement.type = JSON_T_NUMBER;
+				jelement.value = json[i];
+				continue;
+			}
+		}
+
+		// copy value
+		else if (step == STEP_VALUE) {
+			if (jelement.type == JSON_T_STRING) {
+				if (json[i] == '"') step = STEP_END;
+				else jelement.value += json[i];
+				continue;
+			}
+			else if (jelement.type == JSON_T_OBJECT) {
+				if (json[i] == '}' && level == 0) {
+					jelement.value += json[i];
+					step = STEP_END;
+				}
+				else {
+					if (json[i] == '{') level++;	// increase level
+					if (json[i] == '}') level--;	// decrease level
+					jelement.value += json[i];
+				}
+				continue;
+			}
+			else if (jelement.type == JSON_T_ARRAY) {
+				if (json[i] == ']' && level == 0) {
+					jelement.value += json[i];
+					step = STEP_END;
+				}
+				else {
+					if (json[i] == '[') level++;	// increase level
+					if (json[i] == ']') level--;	// decrease level
+					jelement.value += json[i];
+				}
+				continue;
+			}
+			else if (jelement.type == JSON_T_NUMBER) {
+				if ((json[i] < '0' || json[i] > '9') && json[i] != '.' &&
+					json[i] != '+' && json[i] != 'e' && json[i] != 'E') step = STEP_END;
+				else {
+					jelement.value += json[i];
+					continue;
+				}
+			}
+		}
+
+		// another element?
+		if (step == STEP_END) {
+			if (json[i] == ',') {
+//				debug (0, "* JSON.Set Add name:%s", jelement.name.c_str());
+				if (jelement.type != JSON_T_NONE) {
+//					debug (0, "%s:%d json add element type:%d", __FILE__, __LINE__, jelement.type);
+					names.push_back (jelement);
+				}
+				jelement.Clear();
+				step = STEP_STARTNAME;
+			}
+			continue;
+		}
+	}
+//	debug (0, "* JSON.Set Add name:%s", jelement.name.c_str());
+	if (jelement.type != JSON_T_NONE) {
+//		debug (0, "%s:%d json add element type:%d", __FILE__, __LINE__, jelement.type);
+		names.push_back (jelement);
+	}
+
+	return 0;
+};
+
+
+int JSONParse::GetValue(string varname, string *dest) {
+	list<JSONElement>::iterator iter;
+
+	if (dest == NULL) return 0;
+	*dest = "";
+
+	for (iter = names.begin(); iter != names.end(); iter++) {
+		if (varname.compare(iter->name) == 0) {
+			*dest = iter->value;
+			return 1;
+		}
+	}
+
+	return 0;
+};
+
+
+int JSONParse::GetValueInt(string varname, int *dest) {
+	string s;
+	int res = GetValue(varname, &s);
+	if (res) {
+		*dest = atoi (s.c_str());
+		return 1;
+	}
+	return 0;
+};
+
+
+int JSONParse::GetValueInt64(string varname, int64_t *dest) {
+	string s;
+	int res = GetValue(varname, &s);
+	if (res) {
+		*dest = atol (s.c_str());
+		return 1;
+	}
+	return 0;
+};
+
+
+int JSONParse::GetObject(string varname, JSONParse *dest) {
+	list<JSONElement>::iterator iter;
+
+	if (dest == NULL) return 0;
+
+	for (iter = names.begin(); iter != names.end(); iter++) {
+		if (varname.compare(iter->name) == 0) {
+			dest->Set(iter->value);
+			return 1;
+		}
+	}
+
+	return 0;
+};
+
+
+#define MAXRECURSIVE 255
+int JSONParse::GetIdx(string src, int idx, string *dest) {
+	char recursive[MAXRECURSIVE];
+	int i = 0, rcnt = 0, cnt = 0;
+
+	(*dest) = "";
+//	printf("\n***************************************idx:%d\n", idx);
+
+	for (i = 0; i < MAXRECURSIVE; i++) recursive[i] = 0;
+	for (i = 0; i < src.length() && rcnt < MAXRECURSIVE && cnt <= idx; i++) {
+//		printf ("i:%d  rcnt:%d['%c']  cnt:%d  char:'%c' ous:'%s'\n",
+//				i, rcnt, recursive[rcnt], cnt, src[i], dest->c_str());
+		if (src[i] == '[') {
+			recursive[rcnt++] = src[i];
+			continue;
+		}
+		else if (src[i] == '{' && recursive[rcnt] != '"') recursive[++rcnt] = src[i];
+		else if (src[i] == '}' && recursive[rcnt] == '{') rcnt--;
+		else if (src[i] == '"' && recursive[rcnt] == '"') rcnt--;
+		else if (src[i] == '"') recursive[++rcnt] = src[i];
+		else if (src[i] == ',' && rcnt == 1) {
+			cnt++;
+			continue;
+		}
+		else if (src[i] == ']' && rcnt == 1) {
+			continue;
+		}
+
+		if (rcnt > 0 && cnt == idx) {
+			(*dest) += src[i];
+			if (src[i] == '\\') (*dest) += src[i];
+		}
+		else {
+			if (src[i] == '\\')i++;
+		}
+	}
+
+//	printf("\n***************************************idx:%d cnt:%d\n", idx, cnt);
+//	printf("in:'%s'\n***\nout:'%s'\n\n*****\n", src.c_str(), dest->c_str());
+
+	//
+	// final checks
+	if (cnt == 0 && idx == 0 && 			// empty source/array?
+			dest->size() == 0) return 0;	//
+	if (cnt >= idx) return 1;				// found the right element
+	return 0;								// element not found
+}
+#undef MAXRECURSIVE
+
+int JSONParse::GetValueIdx(string varname, int idx, string *dest) {
+	list<JSONElement>::iterator iter;
+
+	if (dest == NULL) return 0;
+
+	for (iter = names.begin(); iter != names.end(); iter++) {
+		if (varname.compare(iter->name) == 0) {
+			return GetIdx(iter->value, idx, dest);
+		}
+	}
+
+	return 0;
+};
+
+int JSONParse::GetObjectIdx(string varname, int idx, JSONParse *dest) {
+	list<JSONElement>::iterator iter;
+	string deststr;
+	int ret = 0;
+
+	if (dest == NULL) return 0;
+
+	for (iter = names.begin(); iter != names.end(); iter++) {
+		if (varname.compare(iter->name) == 0) {
+			ret = GetIdx(iter->value, idx, &deststr);
+			if (ret == 1) dest->Set(deststr);
+			return ret;
+		}
+	}
+
+	return 0;
+};
+
+list<JSONElement> JSONParse::GetElements() {
+	list<JSONElement> l;
+	list<JSONElement>::iterator iter;
+
+	l.clear();
+	for (iter = names.begin(); iter != names.end(); iter++) {
+		l.push_back(*iter);
+	}
+
+	return l;
+};
+
+
+void JSONParse::AddObject (JSONElement element) {
+	names.push_back (element);
+};
+
+
+void JSONParse::AddObject (string name, JSONParse jp) {
+	JSONElement je;
+	je.SetObject(name, jp.ToString());
+	names.push_back(je);
+};
+
+
+void JSONParse::AddObject (string name, int val) {
+	JSONElement je;
+	je.Set(name, val);
+	names.push_back(je);
+};
+
+
+void JSONParse::AddObject (string name, int64_t val) {
+	JSONElement je;
+	je.Set(name, val);
+	names.push_back(je);
+};
+
+
+void JSONParse::AddObject (string name, string val) {
+	JSONElement je;
+	je.Set(name, val);
+	names.push_back(je);
+};
+
+
+void JSONParse::AddObject (string name, double val) {
+	JSONElement je;
+	je.Set(name, val);
+	names.push_back(je);
+};
+
+
+string JSONParse::ToString() {
+	list<JSONElement>::iterator iter;
+	string output;
+	int level, i;
+
+	output = "{";
+
+	for (level = 1, iter = names.begin(); iter != names.end(); iter++) {
+		if (iter != names.begin()) output += ",";
+		output += "\n";
+		for (i = 0; i < 4*level; i++) output += " ";
+		output += iter->GetString();
+	}
+
+	output += "\n}\n";
+
+	return output;
+};
+
+
+/***********************************************************************
+ ***********************************************************************
+ *
+ * JSONElement
+ *
+ ***********************************************************************
+ ***********************************************************************
+ */
+
+
+void JSONElement::Set (string n, double v) {
+	name = n;
+	value = to_string(v);
+	type = JSON_T_NUMBER;
+};
+
+
+void JSONElement::Set (string n, int v) {
+	name = n;
+	value = to_string(v);
+	type = JSON_T_NUMBER;
+};
+
+
+void JSONElement::Set (string n, int64_t v) {
+	name = n;
+	value = to_string(v);
+	type = JSON_T_NUMBER;
+};
+
+
+void JSONElement::Set (string n, string v) {
+	name = n;
+	value = v;
+	type = JSON_T_STRING;
+};
+
+
+void JSONElement::SetArray (string n, list<JSONElement> *l) {
+	list<JSONElement>::iterator iter;
+
+	name = n;
+	value = "[";
+	type = JSON_T_STRING;
+
+	for (iter = l->begin(); iter != l->end(); iter++) {
+		if (iter != l->begin()) value += ",";
+		value += iter->GetString();
+	}
+	value += "]";
+};
+
+
+void JSONElement::SetObject (string n, string s) {
+	name = n;
+	value = s;
+	type = JSON_T_OBJECT;
+};
+
+
+string JSONElement::GetString () {
+	string output = "";
+	string filename = __FILE__;
+
+	switch (type) {
+	case(JSON_T_NUMBER):
+				output += "\"" + name + "\" : " + value;
+				break;
+	case(JSON_T_STRING):
+				if (value.length()==0) {
+					output += "\"" + name + "\" : \"\"";
+				}
+				else if (value[0] != '"') {
+					output += "\"" + name + "\" : \"" + value + "\"";
+				}
+				else output += "\"" + name + "\" : " + value;
+				break;
+	case(JSON_T_OBJECT):
+				output += "\"" + name + "\" : " + value;
+				break;
+	case(JSON_T_ARRAY):
+				if (value.length()==0) {
+					output += "\"" + name + "\" : []";
+				}
+				else if (value[0] != '[') {
+					output += "\"" + name + "\" : [" + value + "]";
+				}
+				else output += "\"" + name + "\" : " + value;
+				break;
+	default:
+		output += "\"error\" : \""+ filename + ":" + to_string(__LINE__) + " JSONElement unknown type error\"("+to_string(type)+")";
+		break;
+	}
+
+	return output;
+};
+
--- a/json.h
+++ b/json.h
@ -0,0 +1,77 @@
+///////////////////////////////////////////////////////////////////////////////// 
+//
+// json.h is part of TestModbus-Server.
+//
+///////////////////////////////////////////////////////////////////////////////// 
+
+#ifndef _JSON_H_
+#define _JSON_H_
+
+#include <list>
+#include <string>
+#include <string.h>
+
+using namespace std;
+
+enum {
+	JSON_T_NONE,
+	JSON_T_STRING,
+	JSON_T_NUMBER,
+	JSON_T_OBJECT,
+	JSON_T_ARRAY
+};
+
+class JSONElement {
+public:
+	int type;
+	string name;
+	string value;
+
+	JSONElement() { Clear(); };
+	~JSONElement() {};
+
+	void Clear() { type = JSON_T_NONE; name = ""; value = ""; };
+	void Set (string n, double v);
+	void Set (string n, int v);
+	void Set (string n, int64_t v);
+	void Set (string n, string v);
+	void SetArray (string n, list<JSONElement> *l);
+	void SetObject (string n, string s);
+	string GetString();
+};
+
+class JSONParse {
+private:
+	string jsondata;
+	list<JSONElement> names;
+
+public:
+	JSONParse() { Set("{}"); };
+	JSONParse(string json) { Set(json); };
+	~JSONParse() {};
+
+	void Clear();
+	int Set(string json);
+
+	int GetValue(string varname, string *dest);
+	int GetValueInt(string varname, int *dest);
+	int GetValueInt64(string varname, int64_t *dest);
+	int GetObject(string varname, JSONParse *dest);
+
+	int GetIdx(string src, int idx, string *dest);
+	int GetValueIdx(string varname, int idx, string *dest);
+	int GetObjectIdx(string varname, int idx, JSONParse *dest);
+	
+	list<JSONElement> GetElements();
+
+	void AddObject (JSONElement element);
+	void AddObject (string name, int val);
+	void AddObject (string name, int64_t val);
+	void AddObject (string name, string val);
+	void AddObject (string name, double val);
+	void AddObject (string name, JSONParse jp);
+
+	string ToString();
+};
+
+#endif 								// _JSON_H_
--- a/main.cc
+++ b/main.cc
@ -0,0 +1,107 @@
+///////////////////////////////////////////////////////////////////////////////// 
+//
+// main.cc is part of TestModbus-Server.
+//
+///////////////////////////////////////////////////////////////////////////////// 
+
+#include <sys/time.h>
+
+#include "config.h"
+#include "mbsconfig.h"
+#include "gui.h"
+#include "modbus.h"
+
+//////////////////////////////////////////////////////////////////////////////////////////////////
+//
+// global variables
+//
+
+Config config;
+Modbus modbus;
+GtkBuilder *_builder_ = NULL;		// work around for the thread situation
+uint16_t modbusdata[4][0x10000];	// needed for work with the gui will by synced by the modbus call back functions
+
+gboolean modbus_callback(gpointer data);
+
+int main (int argc, char **argv) {
+	GtkBuilder *builder;
+	GObject *window;
+
+#ifdef BUILD_WINDOWS
+	char buffer[16];
+	setvbuf (stdout, buffer, _IONBF, 16);
+#endif
+
+	printf ("TestModbus-Server - %s\n", VERSION);
+	printf ("  https://steffen.gulpe.de/modbus-tcpip\n");
+	printf ("  written by Steffen Pohle <steffen@gulpe.de>\n");
+
+	gtk_init (&argc, &argv);
+	_builder_ = builder = gtk_builder_new ();
+	gtk_builder_add_from_file (builder, BUILDER_FILE, NULL);
+	gtk_builder_connect_signals(builder, builder);
+
+	//
+	// #if defined _WIN32 || defined _WIN64 || defined __CYGWIN__
+	// #else
+	// #endif
+	//
+
+	modbus.SetCallback(&modbus_callback);
+	window = gtk_builder_get_object (builder, "testmodbus-server");
+	gtk_widget_show_all (GTK_WIDGET(window));
+
+	if (argc == 2) {
+		printf ("Load File:%s\n", argv[1]);
+		config.SetFilename(argv[1]);
+		load_file(config.GetFilename());
+	}
+	else {
+		printf ("Load File:default.modbus\n");
+		config.SetFilename("default.modbus");
+		load_file(config.GetFilename());
+	}
+
+	gtk_main ();
+
+	return 0;
+}
+
+string to_hex16 (int v) {
+	char HEX[] = "0123456789ABCDEF";
+	int i = v;
+	int n;
+	string txt = "";
+
+	for (n = 0; n < 4; n++) {
+		txt = HEX[i%16]+ txt;
+		i = i / 16;
+	}
+
+	return txt;
+}
+
+
+gboolean modbus_callback(gpointer data) {
+	struct modbus_callback_data *mdata = (struct modbus_callback_data *) data;
+
+	MBData_ChangeRegs(mdata->fc, mdata->regstart, mdata->count, mdata->r);
+	Values_ChangeRegs(mdata->fc, mdata->regstart, mdata->count, mdata->r);
+
+	if (mdata->r) free (mdata->r);
+	free (mdata);
+
+	return FALSE;
+};
+
+
+float get_cycletime(struct timeval *t) {
+	struct timeval t1;
+	float f = 0.0;
+
+	t1 = *t;
+	gettimeofday(t, NULL);
+	f = (float)(t->tv_sec - t1.tv_sec) + ((t->tv_usec - t1.tv_usec) / 1000000.0);
+
+	return f;
+}
--- a/mbsconfig.cc
+++ b/mbsconfig.cc
@ -0,0 +1,32 @@
+///////////////////////////////////////////////////////////////////////////////// 
+//
+// mbsconfig.cc is part of TestModbus-Server.
+//
+///////////////////////////////////////////////////////////////////////////////// 
+
+#include "mbsconfig.h"
+
+Config::Config () {
+	port = 502;
+	filename = "";
+};
+
+
+Config::~Config () {
+};
+
+
+void Config::SetPort (int p) {
+	if (p < 0) port = 502;
+	else if (p > 0xFFFF) port = 502;
+	else port = p;
+
+	printf ("Config::%s (%d)\n", __FUNCTION__, port);
+};
+
+
+void Config::SetFilename (std::string f) {
+	filename = f;
+
+	printf ("Config::%s (%s)\n", __FUNCTION__, f.c_str());
+};
--- a/mbsconfig.h
+++ b/mbsconfig.h
@ -0,0 +1,47 @@
+///////////////////////////////////////////////////////////////////////////////// 
+//
+// mbsconfig.h is part of TestModbus-Server.
+// 
+///////////////////////////////////////////////////////////////////////////////// 
+
+/*
+ modbusserver configuration
+ */
+
+#ifndef _MBSCONFIG_H_
+#define _MBDCONFIG_H_
+
+#include "config.h"
+#include "modbus.h"
+#include <string>
+
+// maybe soon internationalisation
+#define _(__s) __s
+
+class Config {
+	private:
+		std::string filename;
+		int port;
+	public:
+		Config ();
+		~Config();
+
+		void SetPort (int p);
+		int GetPort () { return port; };
+
+		void SetFilename(std::string f);
+		std::string GetFilename() { return filename; };
+
+		int Save();	// 							RETURN 0 on error
+		int Read();	// first set filename		RETURN 0 on errro
+};
+
+
+
+//
+// declared in main.cc
+//
+extern Config config;
+extern Modbus modbus;
+
+#endif
--- a/modbus.cc
+++ b/modbus.cc
@ -0,0 +1,891 @@
+///////////////////////////////////////////////////////////////////////////////// 
+//
+// modbus.cc is part of TestModbus-Server.
+//
+///////////////////////////////////////////////////////////////////////////////// 
+
+#include <errno.h>
+#include <glib.h>
+#if defined(_WIN32) || defined(_WIN64) || defined(__CYGWIN__)
+#else
+  #include <unistd.h> /* close() */
+#endif
+
+#include "gui.h"
+#include "modbus.h"
+#include "mbsconfig.h"
+#include "config.h"
+
+//
+// C / C++ Wrapper
+gpointer _ServerThread (gpointer data) {
+	modbus.ServerThread ();
+	return NULL;
+};
+
+//
+//
+
+Modbus::Modbus () {
+	onchangecallback = NULL;
+	ModbusRegister r = {0, false, 0, false};
+	port = 502;
+	g_mutex_init (&servermutex);
+	serverthread = NULL;
+	for (int i = 0; i < MODBUS_MAXCLIENTS; i++) {
+		clients[i] = NULL;
+	}
+
+	for (int i = 0; i < MODBUS_IOBUFFER; i++) {
+		mbarray[FC1][i] = r;
+		mbarray[FC2][i] = r;
+		mbarray[FC3][i] = r;
+		mbarray[FC4][i] = r;
+	}
+};
+
+Modbus::~Modbus () {
+	for (int i = 0; i < MODBUS_MAXCLIENTS; i++) {
+		if (clients[i] != NULL) {
+			delete clients[i];
+			clients[i] = NULL;
+		}
+	}
+};
+
+
+int Modbus::isRunning() {
+	return tcpserver.IsListen();
+};
+
+
+int Modbus::Start(int serverport) {
+
+	port = serverport;
+	serverthread = g_thread_new("network thread", _ServerThread, NULL);
+
+	return 1;
+};
+
+void Modbus::Stop() {
+	g_mutex_lock(&servermutex);
+	for (int i = 0; i < MODBUS_MAXCLIENTS; i++) {
+		if (clients[i] != NULL) {
+			delete clients[i];
+			clients[i] = NULL;
+		}
+	}
+	tcpserver.Close();
+	g_mutex_unlock(&servermutex);
+};
+
+
+void Modbus::CloseConnection(int slot) {
+	if (slot < 0 || slot >= MODBUS_MAXCLIENTS) return;	// slot out of bound
+	if (clients[slot] != NULL)
+		delete clients[slot];
+	clients[slot] = NULL;
+};
+
+
+void Modbus::SetCallback (gboolean (*callback_func)(gpointer data)) {
+	onchangecallback = callback_func;
+}
+
+/***************************************************************************************************
+ * this should only be called from within the ServerThread function
+ */
+void Modbus::ReadData(gpointer pdata) {
+	int slot;
+	long int len;
+
+	for (slot = 0; slot < MODBUS_MAXCLIENTS; slot++) if (&clients[slot] == pdata) break;
+
+	if (slot < 0 || slot >= MODBUS_MAXCLIENTS) return;	// slot out of bound
+	if (clients[slot] == NULL) return; 					// slot not connected?
+
+	len = clients[slot]->Read(inbuffer, MODBUS_IOBUFFER);
+	if (len < 0) {
+		CloseConnection(slot);
+	}
+};
+
+
+void Modbus::ServerThread() {
+	int keep_running = 1;
+	int ret;
+	struct timeval cycletimestamp = { 0 };
+	float cycletime = 0.0;
+	string s;
+
+	g_mutex_lock(&servermutex);
+	ret = tcpserver.Listen(port);
+	if (ret != 1) {
+		printf ("error:%s\n", strerror(errno));
+		keep_running = 0;
+	}
+	g_mutex_unlock(&servermutex);
+
+	//
+	// primary network loop
+	//
+	while (keep_running) {
+		TCP *tcp = NULL;
+		int slot;
+		int len;
+
+		cycletime = get_cycletime (&cycletimestamp);
+
+		//
+		// accept new connection?
+		g_mutex_lock(&servermutex);
+		if ((tcp = tcpserver.Accept()) != NULL) {
+			for (slot = 0; slot < MODBUS_MAXCLIENTS; slot++) {
+				if (clients[slot] == NULL) break;
+			}
+
+			if (slot < MODBUS_MAXCLIENTS && tcp) {
+				char *msg;
+				clients[slot] = tcp;
+				msg = (char*) malloc (255);
+				snprintf (msg, 255, "new connection from %s\n", clients[slot]->GetRemoteAddr().c_str());
+				gdk_threads_add_idle(cb_thread_network_text_add, msg);
+			}
+			else {
+				// no free slot, accept and close right away.
+				if (tcp) delete tcp;
+			}
+		}
+
+		//
+		//
+		// loop through all clients
+		for (slot = 0; slot < MODBUS_MAXCLIENTS; slot++) {
+			if (clients[slot] != NULL) {
+				len = clients[slot]->ReadTimeout(inbuffer, MODBUS_IOBUFFER, 0);
+				if (len < 0) {
+					delete clients[slot];
+					clients[slot] = NULL;
+				}
+				else if (len > 0) {
+					//
+					// incomming data
+					//
+					struct modbus_data *mbindata = (struct modbus_data*) malloc(sizeof (struct modbus_data));
+
+					if (len > 0x10000) {
+						printf ("%s:%d out of bound inbuffer? len:%d max %d\n", __FILE__, __LINE__, len, 0x10000);
+						exit (1);
+					}
+
+					//
+					// reset and copy data to default values
+					strncpy (mbindata->hostname, clients[slot]->GetRemoteAddr().c_str(), TEXT_LEN);
+					memcpy (mbindata->buffer, inbuffer, len);
+					mbindata->bufferlen = len;
+					mbindata->fc = 0;
+					mbindata->regcnt = -1;
+					mbindata->regstart = -1;
+					mbindata->unitid = 0;
+					mbindata->length = 0;
+					mbindata->transactionid = 0;
+					mbindata->protoolid = 0;
+
+					Decode(mbindata);
+					gdk_threads_add_idle(cb_thread_network_data_add, mbindata);
+
+					//
+					// fill in outdata
+					//
+
+					//
+					// reply data - outbuffer
+					//
+					struct modbus_data *mboutdata = (struct modbus_data*) malloc(sizeof (struct modbus_data));
+					strncpy (mboutdata->hostname, clients[slot]->GetRemoteAddr().c_str(), TEXT_LEN);
+					memset (mboutdata->buffer, 0x0, 0x10000);
+					mboutdata->bufferlen = 0;
+					mboutdata->fc = 0;
+					mboutdata->regcnt = -1;
+					mboutdata->regstart = -1;
+					mboutdata->unitid = 0;
+					mboutdata->length = 0;
+					mboutdata->transactionid = 0;
+					mboutdata->protoolid = 0;
+					if (mbindata->fc >= 1 && mbindata->fc <= 4) {
+						if (WorkerAndEncodeRead(mbindata, mboutdata)) {
+							clients[slot]->Write(mboutdata->buffer, mboutdata->bufferlen);
+						}
+						else {
+							char *txt = (char*)malloc(255);
+							snprintf (txt, 255, "error on processing message\n");
+							gdk_threads_add_idle(cb_thread_network_text_add, txt);
+						}
+					}
+					else if (mbindata->fc == 5 || mbindata->fc == 6) {
+						if (WorkerAndEncodeWriteSingle(mbindata, mboutdata)) {
+							clients[slot]->Write(mboutdata->buffer, mboutdata->bufferlen);
+						}
+						else {
+							char *txt = (char*)malloc(255);
+							snprintf (txt, 255, "error on processing message\n");
+							gdk_threads_add_idle(cb_thread_network_text_add, txt);
+						}
+					}
+					else if (mbindata->fc == 15 || mbindata->fc == 16) {
+						if (WorkerAndEncodeWriteMulti(mbindata, mboutdata)) {
+							clients[slot]->Write(mboutdata->buffer, mboutdata->bufferlen);
+						}
+						else {
+							char *txt = (char*)malloc(255);
+							snprintf (txt, 255, "error on processing message\n");
+							gdk_threads_add_idle(cb_thread_network_text_add, txt);
+						}
+					}
+					gdk_threads_add_idle(cb_thread_network_data_add, mboutdata);
+				}
+			}
+		}
+		// unlock servermutex
+		cycletime = get_cycletime (&cycletimestamp);
+		s = "modbus cycletime: " + std::to_string(1000.0 * cycletime) + "ms";
+		gdk_threads_add_idle(cb_thread_status, &s);
+
+		g_mutex_unlock(&servermutex);
+
+		// wait some time (10ms)
+		usleep (10000);
+
+		g_mutex_lock(&servermutex);
+		keep_running = tcpserver.IsListen();
+		g_mutex_unlock(&servermutex);
+	}
+	s = "modbus server stoped";
+	gdk_threads_add_idle(cb_thread_status, &s);  // not thread save we wait 100ms to be sure
+	usleep (10000);
+}
+
+
+// return 0 on error
+int Modbus::WorkerAndEncodeRead(struct modbus_data *mbin, struct modbus_data *mbout) {
+	//
+	// to prevent race condition and invalid data: servermutex must be already locked
+	// buffer on outdata must be of size 0x10000
+	uint16_t i16;
+	uint8_t	 i8;
+	int pos = 0;
+	int i;
+	int c;
+	int error = 0;
+
+	// transaction
+	mbout->transactionid = mbin->transactionid;
+	i16 = htons((uint16_t)mbin->transactionid);
+	memcpy (mbout->buffer+pos, &i16, sizeof(i16));
+	pos += sizeof (i16);
+
+	// protocolid
+	mbout->protoolid = mbin->protoolid;
+	i16 = htons((uint16_t)mbin->protoolid);
+	memcpy (mbout->buffer+pos, &i16, sizeof(i16));
+	pos += sizeof (i16);
+
+	// length  3 + number of registers
+	mbout->length = 3;
+	if (mbin->fc == 1 || mbin->fc == 2) {
+		mbout->length += mbin->regcnt / 8;
+		if ((mbin->regcnt % 8) > 0) mbout->length += 1;
+	}
+	else if (mbin->fc == 4 || mbin->fc == 3) {
+		mbout->length += mbin->regcnt * 2;		// 16bit = 2Bytes
+	}
+	if (mbout->length > 0x1000-6) {
+		printf ("outbuffer to small? mbout-length:%d\n", mbout->length);
+		return 0;
+	}
+	i16 = htons((uint16_t)mbout->length);
+	memcpy (mbout->buffer+pos, &i16, sizeof(i16));
+	pos += sizeof (i16);
+
+	// device id
+	mbout->unitid = mbin->unitid;
+	memcpy (mbout->buffer+pos, &mbout->unitid, sizeof(uint8_t));
+	pos += sizeof (uint8_t);
+
+	// fc
+	mbout->fc = mbin->fc;
+	memcpy (mbout->buffer+pos, &mbout->fc, sizeof(uint8_t));
+	pos += sizeof (uint8_t);
+
+	// length of data in bytes??????
+	i8 = 0;
+	if (mbin->fc == 1 || mbin->fc == 2) {
+		i8 += mbin->regcnt / 8;
+		if ((mbin->regcnt % 8) > 0) i8 += 1;
+	}
+	else if (mbin->fc == 4 || mbin->fc == 3) {
+		i8 += mbin->regcnt * 2;		// 16bit = 2Bytes
+	}
+	mbout->regcnt = i8;
+	memcpy (mbout->buffer+pos, &i8, sizeof(uint8_t));
+	pos += sizeof (uint8_t);
+
+	mbout->direction = 1;
+
+	//
+	// fill in the buffer
+	if (mbin->fc == 1 || mbin->fc == 2) {
+		uint8_t u8 = 0;
+		for (c= 0, i = mbin->regstart; i < mbin->regstart + mbin->regcnt; i++, c++) {
+			if (c != 0 && c%8 == 0) {
+				memcpy (&mbout->buffer[pos], &u8, 1);
+				u8 = 0;
+				pos++;
+			}
+
+			if (mbin->fc == 1) {
+				if (!mbarray[FC1][i].enabled) error = 1;			// Error
+				mbarray[FC1][i].requested |= 1;
+				if (mbarray[FC1][i].value) 			u8 |= (1<<(c%8));
+			}
+			else if (mbin->fc == 2) {
+				if (!mbarray[FC2][i].enabled) error = 1;			// Error
+				mbarray[FC2][i].requested |= 1;
+				if (mbarray[FC2][i].value) 			u8 |= (1<<(c%8));
+			}
+			else {
+				printf ("unknown fc code?  fc:%d\n", mbin->fc);
+				error = 1;
+			}
+		}
+		memcpy (&mbout->buffer[pos], &u8, 1);
+		pos++;
+	}
+	else if (mbin->fc == 4 || mbin->fc == 3) {
+		for (i = mbin->regstart; i < mbin->regstart + mbin->regcnt; i++) {
+			if (mbin->fc == 3) {
+				if (!mbarray[FC3][i].enabled) error = 1;			// return nothing
+				mbarray[FC3][i].requested |= 1;
+				i16 = htons(mbarray[FC3][i].value);
+			}
+			if (mbin->fc == 4) {
+				if (!mbarray[FC4][i].enabled) error = 1;			// return nothing
+				mbarray[FC4][i].requested |= 1;
+				i16 = htons(mbarray[FC4][i].value);
+			}
+			memcpy (mbout->buffer+pos, &i16, sizeof(i16));
+			pos += sizeof (i16);
+		}
+	}
+
+	//
+	// inform the application about the modbus values change
+	if (onchangecallback != NULL && mbin->regcnt > 0) {
+		struct modbus_callback_data *mdata = (struct modbus_callback_data*) malloc(sizeof(struct modbus_callback_data));
+
+		mdata->r = (ModbusRegister *) malloc (sizeof (ModbusRegister) * mbin->regcnt);
+		int fc = mbin->fc;
+		if (fc == 5)  fc = 1;
+		if (fc == 6)  fc = 3;
+		if (fc == 15)  fc = 1;
+		if (fc == 16)  fc = 3;
+
+		if (fc == 1)
+			memcpy (mdata->r, &mbarray[FC1][mbin->regstart], sizeof (ModbusRegister) * mbin->regcnt);
+		else if (fc == 2)
+			memcpy (mdata->r, &mbarray[FC2][mbin->regstart], sizeof (ModbusRegister) * mbin->regcnt);
+		else if (fc == 3)
+			memcpy (mdata->r, &mbarray[FC3][mbin->regstart], sizeof (ModbusRegister) * mbin->regcnt);
+		else if (fc == 4)
+			memcpy (mdata->r, &mbarray[FC4][mbin->regstart], sizeof (ModbusRegister) * mbin->regcnt);
+
+		g_mutex_unlock(&servermutex);
+		mdata->fc = fc;
+		mdata->regstart = mbin->regstart;
+		mdata->count = mbin->regcnt;
+		gdk_threads_add_idle(onchangecallback, mdata);  // not thread save we wait 100ms to be sure;
+		g_mutex_lock(&servermutex);
+	}
+
+	mbout->bufferlen = pos;
+
+	if (error) return 0;
+	else return 1;
+}
+
+
+int Modbus::WorkerAndEncodeWriteSingle(struct modbus_data *mbin, struct modbus_data *mbout) {
+	uint16_t i16;
+	int pos = 0;
+	int error = 0;
+
+	// transaction
+	mbout->transactionid = mbin->transactionid;
+	i16 = htons((uint16_t)mbin->transactionid);
+	memcpy (mbout->buffer+pos, &i16, sizeof(i16));
+	pos += sizeof (i16);
+
+	// protocolid
+	mbout->protoolid = mbin->protoolid;
+	i16 = htons((uint16_t)mbin->protoolid);
+	memcpy (mbout->buffer+pos, &i16, sizeof(i16));
+	pos += sizeof (i16);
+
+	// length  3 + number of registers
+	mbout->length = 3;
+	mbout->length += mbin->regcnt * 2;		// 16bit = 2Bytes
+	i16 = htons((uint16_t)mbout->length);
+	memcpy (mbout->buffer+pos, &i16, sizeof(i16));
+	pos += sizeof (i16);
+
+	// device id
+	mbout->unitid = mbin->unitid;
+	memcpy (mbout->buffer+pos, &mbout->unitid, sizeof(uint8_t));
+	pos += sizeof (uint8_t);
+
+	// fc
+	mbout->fc = mbin->fc;
+	memcpy (mbout->buffer+pos, &mbout->fc, sizeof(uint8_t));
+	pos += sizeof (uint8_t);
+
+	mbout->direction = 1;
+
+	if (mbin->fc == 5) {
+		mbarray[FC1][mbin->regstart].requested |= 2;
+		if (mbarray[FC1][mbin->regstart].enabled) {
+			if (mbin->regcnt == 0xFF00)		mbarray[FC1][mbin->regstart].value = 1;
+			else 							mbarray[FC1][mbin->regstart].value = 0;
+		}
+		else error = 1;
+
+		// return register and value
+		i16 = htons((uint16_t)mbin->regstart);
+		memcpy (mbout->buffer+pos, &i16, sizeof(i16));
+		pos += sizeof (i16);
+
+		i16 = htons((uint16_t)mbin->regcnt);
+		memcpy (mbout->buffer+pos, &i16, sizeof(i16));
+		pos += sizeof (i16);
+	}
+	if (mbin->fc == 6) {
+		mbarray[FC3][mbin->regstart].requested |= 2;
+		if (mbarray[FC3][mbin->regstart].enabled)
+			mbarray[FC3][mbin->regstart].value = mbin->regcnt;
+		else error = 1;
+
+		// return register and value
+		i16 = htons((uint16_t)mbin->regstart);
+		memcpy (mbout->buffer+pos, &i16, sizeof(i16));
+		pos += sizeof (i16);
+
+		i16 = htons((uint16_t)mbin->regcnt);
+		memcpy (mbout->buffer+pos, &i16, sizeof(i16));
+		pos += sizeof (i16);
+	}
+
+	mbout->bufferlen = pos;
+
+	//
+	// inform the application about the modbus values change
+	if (onchangecallback != NULL) {
+		struct modbus_callback_data *mdata = (struct modbus_callback_data*) malloc(sizeof(struct modbus_callback_data));
+		mdata->r = (ModbusRegister*) malloc(sizeof(ModbusRegister));
+
+		int fc = mbin->fc;
+		if (fc == 5)  fc = 1;
+		if (fc == 6)  fc = 3;
+		if (fc == 15)  fc = 1;
+		if (fc == 16)  fc = 3;
+		*mdata->r = mbarray[fc-1][mbin->regstart];
+		mdata->fc = fc;
+		mdata->regstart = mbin->regstart;
+		mdata->count = 1;
+		g_mutex_unlock(&servermutex);
+		gdk_threads_add_idle(onchangecallback, mdata);  // not thread save we wait 100ms to be sure;
+		g_mutex_lock(&servermutex);
+	}
+
+	if (error) return 0;
+	else return 1;
+}
+
+
+int Modbus::WorkerAndEncodeWriteMulti(struct modbus_data *mbin, struct modbus_data *mbout) {
+	uint16_t i16;
+	int pos = 0;
+	int i;
+	int c;
+	int error = 0;
+
+	// transaction
+	mbout->transactionid = mbin->transactionid;
+	i16 = htons((uint16_t)mbin->transactionid);
+	memcpy (mbout->buffer+pos, &i16, sizeof(i16));
+	pos += sizeof (i16);
+
+	// protocolid
+	mbout->protoolid = mbin->protoolid;
+	i16 = htons((uint16_t)mbin->protoolid);
+	memcpy (mbout->buffer+pos, &i16, sizeof(i16));
+	pos += sizeof (i16);
+
+	// length  3 + number of registers
+	mbout->length = 3;
+	mbout->length += mbin->regcnt * 2;		// 16bit = 2Bytes
+	i16 = htons((uint16_t)mbout->length);
+	memcpy (mbout->buffer+pos, &i16, sizeof(i16));
+	pos += sizeof (i16);
+
+	// device id
+	mbout->unitid = mbin->unitid;
+	memcpy (mbout->buffer+pos, &mbout->unitid, sizeof(uint8_t));
+	pos += sizeof (uint8_t);
+
+	// fc
+	mbout->fc = mbin->fc;
+	memcpy (mbout->buffer+pos, &mbout->fc, sizeof(uint8_t));
+	pos += sizeof (uint8_t);
+
+	mbout->direction = 1;
+
+	if (mbin->fc == 15) {
+		for (i = 0; mbin->regstart+i < 0x10000 && i < mbin->regcnt; i++) {
+			mbarray[FC1][mbin->regstart+i].requested |= 2;
+			if (mbarray[FC1][mbin->regstart+i].enabled) {
+				if (mbin->buffer[13+(i/8)] & (1<<(i%8)))	mbarray[FC1][mbin->regstart+i].value = 1;
+				else			 							mbarray[FC1][mbin->regstart+i].value = 0;
+			}
+			else error = 1;
+		}
+
+		// return register and value
+		i16 = htons((uint16_t)mbin->regstart);
+		memcpy (mbout->buffer+pos, &i16, sizeof(i16));
+		pos += sizeof (i16);
+
+		i16 = htons((uint16_t)mbin->regcnt);
+		memcpy (mbout->buffer+pos, &i16, sizeof(i16));
+		pos += sizeof (i16);
+	}
+	if (mbin->fc == 16) {
+		for (c = 13, i = 0; i < mbin->regcnt && mbin->regstart+i < 0x10000; i++, c += sizeof(uint16_t)) {
+			memcpy (&i16, mbin->buffer+c, sizeof(i16));
+			mbarray[FC3][mbin->regstart+i].requested |= 2;
+			if (mbarray[FC3][mbin->regstart+i].enabled)
+				mbarray[FC3][mbin->regstart+i].value = ntohs(i16);
+			else error = 1;
+		}
+
+		// return register and value
+		i16 = htons((uint16_t)mbin->regstart);
+		memcpy (mbout->buffer+pos, &i16, sizeof(i16));
+		pos += sizeof (i16);
+
+		i16 = htons((uint16_t)mbin->regcnt);
+		memcpy (mbout->buffer+pos, &i16, sizeof(i16));
+		pos += sizeof (i16);
+	}
+
+	mbout->bufferlen = pos;
+
+	//
+	// inform the application about the modbus values change
+	if (onchangecallback != NULL && mbin->regcnt > 0 && mbin->regstart > 0 && mbin->regstart < 0x10000) {
+		struct modbus_callback_data *mdata = (struct modbus_callback_data*) malloc(sizeof(struct modbus_callback_data));
+		mdata->r = (ModbusRegister*) malloc (sizeof (ModbusRegister) * mbin->regcnt);;
+
+		int fc = mbin->fc;
+		if (fc == 5)  fc = 1;
+		if (fc == 6)  fc = 3;
+		if (fc == 15)  fc = 1;
+		if (fc == 16)  fc = 3;
+
+		if (mbin->regstart+mbin->regcnt > 0xFFFF) {
+			printf ("%s:%d ERROR: mbin->regstart+mbin->regcnt > 0xFFFF   limit:%x \n", __FILE__, __LINE__, mbin->regstart+mbin->regcnt);
+			exit (1);
+		}
+
+		if (fc == 1)
+			memcpy (mdata->r, &mbarray[FC1][mbin->regstart], sizeof (ModbusRegister) * mbin->regcnt);
+		else if (fc == 2)
+			memcpy (mdata->r, &mbarray[FC2][mbin->regstart], sizeof (ModbusRegister) * mbin->regcnt);
+		else if (fc == 3)
+			memcpy (mdata->r, &mbarray[FC3][mbin->regstart], sizeof (ModbusRegister) * mbin->regcnt);
+		else if (fc == 4)
+			memcpy (mdata->r, &mbarray[FC4][mbin->regstart], sizeof (ModbusRegister) * mbin->regcnt);
+
+		g_mutex_unlock(&servermutex);
+		mdata->fc = fc;
+		mdata->regstart = mbin->regstart;
+		mdata->count = mbin->regcnt;
+		gdk_threads_add_idle(onchangecallback, mdata);  // not thread save we wait 100ms to be sure;
+		g_mutex_lock(&servermutex);
+	}
+
+	if (error) return 0;
+	else return 1;
+}
+
+
+
+void Modbus::Decode(struct modbus_data *mbdata) {
+	//
+	uint16_t i16;
+	uint8_t	 i8;
+	int pos = 0;
+
+	mbdata->fc = 0;
+	mbdata->regcnt = -1;
+	mbdata->regstart = -1;
+	mbdata->unitid = 0;
+	mbdata->length = 0;
+	mbdata->direction = 0;
+	mbdata->transactionid = 0;
+	mbdata->protoolid = 0;
+	mbdata->bytecnt = 0;
+
+	if (mbdata->bufferlen < 8) return;
+
+	// Transaction
+	memcpy (&i16, mbdata->buffer+pos, sizeof(i16));
+	pos += sizeof(i16);
+	mbdata->transactionid = ntohs(i16);
+
+	// protocol
+	memcpy (&i16, mbdata->buffer+pos, sizeof(i16));
+	pos += sizeof(i16);
+	mbdata->protoolid = ntohs(i16);
+
+	// length
+	memcpy (&i16, mbdata->buffer+pos, sizeof(i16));
+	pos += sizeof(i16);
+	mbdata->length = ntohs(i16);
+
+	// unitid
+	memcpy (&i8, mbdata->buffer+pos, sizeof(i8));
+	pos += sizeof(i8);
+	mbdata->unitid = i8;
+
+	// function code
+	memcpy (&i8, mbdata->buffer+pos, sizeof(i8));
+	pos += sizeof(i8);
+	mbdata->fc = i8;
+
+	// register
+	memcpy (&i16, mbdata->buffer+pos, sizeof(i16));
+	pos += sizeof(i16);
+	mbdata->regstart = ntohs(i16);
+
+	// number of registers
+	memcpy (&i16, mbdata->buffer+pos, sizeof(i16));
+	pos += sizeof(i16);
+	mbdata->regcnt = ntohs(i16);
+
+	// unitid
+	memcpy (&i8, mbdata->buffer+pos, sizeof(i8));
+	pos += sizeof(i8);
+	mbdata->bytecnt = i8;
+};
+
+int Modbus::GetRegister(int fc, int regnum, ModbusRegister *r) {
+	 r->enabled = false;
+	 r->requested = 0;
+	 r->updated = false;
+	 r->value = 0;
+
+	 if (regnum < 0 || regnum >= 0x10000) return -1;
+
+	 g_mutex_lock(&servermutex);
+
+	 if (fc == 1) *r = mbarray[FC1][regnum];
+	 else if (fc == 2) *r = mbarray[FC2][regnum];
+	 else if (fc == 3) *r = mbarray[FC3][regnum];
+	 else if (fc == 4) *r = mbarray[FC4][regnum];
+
+	 g_mutex_unlock(&servermutex);
+
+	 return 0;
+};
+
+
+int Modbus::GetRegisters(int fc, int regnum, int count, ModbusRegister *r) {
+	 r->enabled = false;
+	 r->requested = 0;
+	 r->updated = false;
+	 r->value = 0;
+
+	 if (regnum < 0 || regnum >= 0x10000) return -1;
+
+	 g_mutex_lock(&servermutex);
+
+	 if (fc == 1) *r = mbarray[FC1][regnum];
+	 else if (fc == 2) *r = mbarray[FC2][regnum];
+	 else if (fc == 3) *r = mbarray[FC3][regnum];
+	 else if (fc == 4) *r = mbarray[FC4][regnum];
+
+	 g_mutex_unlock(&servermutex);
+
+	 return 0;
+};
+
+
+int Modbus::SetRegister(int fc, int regnum, ModbusRegister *r) {
+	 if (regnum < 0 || regnum >= 0x10000) return -1;
+
+	 g_mutex_lock(&servermutex);
+
+	 if (fc == 1) mbarray[FC1][regnum] = *r;
+	 else if (fc == 2) mbarray[FC2][regnum] = *r;
+	 else if (fc == 3) mbarray[FC3][regnum] = *r;
+	 else if (fc == 4) mbarray[FC4][regnum] = *r;
+
+	 g_mutex_unlock(&servermutex);
+
+	 return 0;
+}
+
+
+int Modbus::SetRegisters(int fc, int regnum, int count, ModbusRegister *r) {
+	int reg = regnum;
+	int regend = regnum+count;
+
+	g_mutex_lock(&servermutex);
+	for (reg = regnum; reg < regend; regnum++) {
+		if (reg < 0 && reg >= 0x10000) {
+			g_mutex_unlock(&servermutex);
+			return -1;
+		}
+
+		if (fc == 1) mbarray[FC1][reg] = *r;
+		else if (fc == 2) mbarray[FC2][reg] = *r;
+		else if (fc == 3) mbarray[FC3][reg] = *r;
+		else if (fc == 4) mbarray[FC4][reg] = *r;
+		r++;
+	}
+	g_mutex_unlock(&servermutex);
+
+	return 0;
+}
+
+
+void Modbus::Enable(int fc, int regstart, int count, int onoff) {
+	int i;
+	if (fc < 1 || fc > 4) return;
+	if (regstart < 0) return;
+	fc--;
+
+	g_mutex_lock(&servermutex);
+	for (i = 0; i < count && regstart < MODBUS_IOBUFFER; i++, regstart++) {
+		mbarray[fc][regstart].enabled = onoff;
+	}
+	g_mutex_unlock(&servermutex);
+};
+
+
+void Modbus::RequestsClear() {
+	int fc, reg;
+
+	g_mutex_lock(&servermutex);
+	for (fc = 0; fc < 4; fc++) for (reg = 0; reg < MODBUS_IOBUFFER; reg++) {
+		mbarray[fc][reg].requested = 0;
+	}
+	g_mutex_unlock(&servermutex);
+};
+
+
+void Modbus::EnableAll(int onoff) {
+	int fc, reg;
+
+	g_mutex_lock(&servermutex);
+	for (fc = 0; fc < 4; fc++) for (reg = 0; reg < MODBUS_IOBUFFER; reg++) {
+		mbarray[fc][reg].enabled = onoff;
+	}
+	g_mutex_unlock(&servermutex);
+};
+
+
+void Modbus::SetRegValue(int fc, int regstart, int count, uint16_t *values) {
+	int reg;
+
+	if (fc <= 0 || fc > 4) {
+		printf ("%s:%d fc(%d) is set out of range\n", __FILE__, __LINE__, fc);
+		return;
+	}
+
+	if (regstart < 0) {
+		printf ("%s:%d regstart(%d) is set out of range\n", __FILE__, __LINE__, regstart);
+		return;
+	}
+
+	if (regstart + count >= MODBUS_IOBUFFER || regstart < 0) {
+		printf ("%s:%d regstart(%d) or count(%d) are set out of range\n", __FILE__, __LINE__, regstart, count);
+		return;
+	}
+
+	g_mutex_lock(&servermutex);
+	for (int i = 0, reg = regstart; i < count && reg < 0x10000; i++, reg++) {
+		mbarray[fc-1][reg].value =  values[i];
+	}
+
+	//
+	// inform the application about the modbus values change
+	if (onchangecallback != NULL && count > 0 && regstart >= 0 && regstart < 0x10000) {
+		struct modbus_callback_data *mdata = (struct modbus_callback_data*) malloc(sizeof(struct modbus_callback_data));
+		mdata->r = (ModbusRegister*) malloc (sizeof (ModbusRegister) * count);
+
+		if (fc == 5)  fc = 1;
+		if (fc == 6)  fc = 3;
+		if (fc == 15)  fc = 1;
+		if (fc == 16)  fc = 3;
+
+		if (regstart+count > 0xFFFF) {
+			printf ("%s:%d ERROR: regstart+count > 0xFFFF   limit:%x \n", __FILE__, __LINE__, regstart+count);
+			exit (1);
+		}
+
+		if (fc == 1)
+			memcpy (mdata->r, &mbarray[FC1][regstart], sizeof (ModbusRegister) * count);
+		else if (fc == 2)
+			memcpy (mdata->r, &mbarray[FC2][regstart], sizeof (ModbusRegister) * count);
+		else if (fc == 3)
+			memcpy (mdata->r, &mbarray[FC3][regstart], sizeof (ModbusRegister) * count);
+		else if (fc == 4)
+			memcpy (mdata->r, &mbarray[FC4][regstart], sizeof (ModbusRegister) * count);
+
+		g_mutex_unlock(&servermutex);
+		mdata->fc = fc;
+		mdata->regstart = regstart;
+		mdata->count = count;
+		gdk_threads_add_idle(onchangecallback, mdata);  // not thread save we wait 100ms to be sure;
+		g_mutex_lock(&servermutex);
+	}
+
+/*	// debug del me
+	printf ("%s:%d %s regs (", __FILE__, __LINE__, __FUNCTION__);
+	std::string text;
+	text = "";
+	if (fc == 5)  fc = 1;
+	if (fc == 6)  fc = 3;
+	if (fc == 15)  fc = 1;
+	if (fc == 16)  fc = 3;
+	for (int r = 0; r < count; r++) {
+		unsigned char c;
+		char hexnum[] = "0123456789ABCDEF";
+
+		c = *(((unsigned char *)&mbarray[fc-1][regstart+r])+0);
+		text += hexnum[c/16];
+		text += hexnum[c%16];
+
+		c = *(((unsigned char *)&mbarray[fc-1][regstart+r])+1);
+		text += hexnum[c/16];
+		text += hexnum[c%16];
+
+		text += ":";
+	}
+
+	printf ("%s)\n", text.c_str());
+*/
+	g_mutex_unlock(&servermutex);
+};
+
+
--- a/modbus.h
+++ b/modbus.h
@ -0,0 +1,113 @@
+///////////////////////////////////////////////////////////////////////////////// 
+//
+// modbus.h is part of TestModbus-Server.
+//
+///////////////////////////////////////////////////////////////////////////////// 
+
+#ifndef _MODBUS_H_
+#define _MODBUS_H_
+
+
+#include <gtk/gtk.h>
+#include <gdk/gdk.h>
+#include <glib.h>
+
+#include "tcp.h"
+#include <list>
+
+
+enum {
+	FC1 = 0,
+	FC2,
+	FC3,
+	FC4,
+	FCCOUNT
+};
+
+#define TEXT_LEN 512
+#define MODBUS_MAXCLIENTS 5
+#define MODBUS_IOBUFFER	0x10000
+
+struct modbus_data {
+	char hostname[TEXT_LEN];
+	char buffer[0x10000];
+	size_t bufferlen;
+	int transactionid;
+	int protoolid;
+	int length;
+	int unitid;
+	int direction;
+	int fc;
+	int regstart;
+	int regcnt;
+	int bytecnt;
+};
+
+
+// return the cycletime in us
+float get_cycletime(struct timeval *t);
+
+struct {
+	uint16_t value;
+	bool enabled;
+	int requested;	// 1 .. Read   2 .. Write
+	bool updated;
+} typedef ModbusRegister;
+
+
+struct modbus_callback_data {
+	int fc;
+	int regstart;
+	int count;
+	ModbusRegister *r;
+};
+
+
+class Modbus {
+private:
+	TCP tcpserver;
+	int port;
+	TCP *clients[MODBUS_MAXCLIENTS];
+	GThread *serverthread;
+	GMutex servermutex;
+	gboolean (*onchangecallback)(gpointer data);
+	ModbusRegister mbarray[FCCOUNT][MODBUS_IOBUFFER];		// for all 4 Registertypes ..
+
+	char inbuffer[MODBUS_IOBUFFER];
+	char outbuffer[MODBUS_IOBUFFER];
+
+	void Decode(struct modbus_data *mbdata);
+	// return 0 on error, 1 on no error
+	int WorkerAndEncodeRead(struct modbus_data *mbin, struct modbus_data *mbout);
+	int WorkerAndEncodeWriteSingle(struct modbus_data *mbin, struct modbus_data *mbout);
+	int WorkerAndEncodeWriteMulti(struct modbus_data *mbin, struct modbus_data *mbout);
+public:
+	Modbus();
+	~Modbus();
+
+	void ServerThread();
+	void SetCallback (gboolean (*callback_func)(gpointer data));
+	int Start(int serverport);
+	void Stop();
+
+	int GetRegister(int fc, int regnum, ModbusRegister *r);
+	int GetRegisters(int fc, int regnum, int count, ModbusRegister *r);
+
+	int SetRegister(int fc, int regnum, ModbusRegister *r);
+	int SetRegisters(int fc, int regnum, int count, ModbusRegister *r);
+	void CloseConnection(int slot);
+	void ReadData(gpointer pdata);
+
+	void Enable(int fc, int regstart, int count, int onoff);
+	void EnableAll(int onoff);
+	void RequestsClear();
+	void SetRegValue(int fc, int regstart, int count, uint16_t *values);
+
+	int isRunning();
+};
+
+#if defined(_WIN32) || defined(_WIN64) || defined(__CYGWIN__)
+#define usleep(_us_) Sleep(_us_/1000)
+#endif
+
+#endif
--- a/tcp.cc
+++ b/tcp.cc
@ -0,0 +1,521 @@
+///////////////////////////////////////////////////////////////////////////////// 
+//
+// tcp.cc is part of TestModbus-Server.
+//
+///////////////////////////////////////////////////////////////////////////////// 
+
+#include "tcp.h"
+#include <stdio.h>
+#if defined(_WIN32) || defined(_WIN64) || defined(__CYGWIN__)
+#else
+  #include <unistd.h> /* close() */
+#endif
+#include <stdlib.h>
+#include <string.h> /* memset() */
+#include <errno.h>
+
+using namespace std;
+
+int tcpinit;
+//
+// convert host and port to sockaddr_in6
+//
+int dns_filladdr (string host, string port, int ai_family, struct sockaddr_storage *sAddr) {
+    struct addrinfo hints, *res;
+    int err;
+
+    bzero (&hints, sizeof (struct addrinfo));
+    hints.ai_family = ai_family;
+    hints.ai_socktype = SOCK_DGRAM;
+
+    if ((err = getaddrinfo (host.c_str(), port.c_str(), &hints, &res)) < 0) {
+    	fprintf (stdout, "dns_filladdr (getaddrinfo):%s\n", gai_strerror (err));
+    	return -1;
+    }
+
+    memcpy (sAddr, res->ai_addr, res->ai_addrlen);
+    freeaddrinfo (res);
+
+    return 1;
+};
+
+
+//
+// convert int to char*
+//
+char* itoa(char* buffer, int number, int size) {
+	snprintf (buffer, size, "%d", number);
+	return buffer;
+}
+
+
+TCP::~TCP() {
+	Close();
+}
+
+TCP::TCP() {
+	if (tcpinit == 0) {
+#ifdef BUILD_WINDOWS
+
+		WORD wVersionRequested;
+		WSADATA wsaData;
+		int err;
+
+		/* Use the MAKEWORD(lowbyte, highbyte) macro declared in Windef.h */
+		wVersionRequested = MAKEWORD(2, 2);
+
+		err = WSAStartup(wVersionRequested, &wsaData);
+		if (err != 0) {
+			/* Tell the user that we could not find a usable */
+			/* Winsock DLL.                                  */
+			printf("WSAStartup failed with error: %d\n", err);
+			return;
+		}
+#endif
+		tcpinit = 1;
+	}
+	sock = 0;
+	writecnt = 0;
+	readcnt = 0;
+	islisten = 0;
+};
+
+TCP::TCP(int s) {
+	TCP();
+	sock = s;
+//	memset (&localaddr, 0x0, sizeof(localaddr));
+//	memset (&remoteaddr, 0x0, sizeof(remoteaddr));
+	writecnt = 0;
+	readcnt = 0;
+	islisten = 0;
+};
+
+TCP::TCP(string h, string p) {
+	TCP();
+	Connect (h,p);
+};
+
+
+int TCP::Listen(int port) {
+	char buffer[NET_BUFFERSIZE];
+	int err, i;
+    struct addrinfo hints, *res, *rp;
+
+	if (sock > 0) Close();
+// FIXME: solution to get both (IPV4 and IPV6) to work at the same time?
+	bzero (&hints, sizeof (struct addrinfo));
+    hints.ai_flags = AI_PASSIVE;
+#if defined(_WIN32) || defined(_WIN64) || defined(__CYGWIN__)
+    hints.ai_family = AF_INET;
+#else
+    hints.ai_family = AF_INET6;
+#endif
+    hints.ai_socktype = SOCK_STREAM;
+    if ((err = getaddrinfo (NULL, itoa(buffer, port, 32), &hints, &res)) != 0) {
+    	return 0;
+    }
+
+    //
+    // walk through all results until we could connect
+    //
+    for (rp = res; rp != NULL; rp = rp->ai_next) {
+        sock = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
+        if (sock == -1) continue;
+
+        i = 1;
+        if ((err = setsockopt (sock, SOL_SOCKET, SO_REUSEADDR, (char*)&i, sizeof (i))) != 0) {
+        	printf ("%s:%d setsockopt error\n", __FILE__, __LINE__);
+        }
+
+        if ((err = bind (sock, rp->ai_addr, rp->ai_addrlen)) < 0) {
+			close (sock);
+			sock = -1;
+			continue;
+        }
+        if (listen (sock, 8) < 0) {	// maximum of 8 connections at the time
+			close (sock);
+			sock = -1;
+			continue;
+        }
+        break;
+    }
+
+    freeaddrinfo (res);
+
+    if (rp == NULL) {
+    	sock = -1;
+    	return 0;
+    }
+
+    islisten = 1;
+
+    return 1;
+};
+
+
+TCP* TCP::Accept() {
+	fd_set rfds;
+	struct timeval tv;
+	int retval, err, i;
+	SOCKET newsock;
+	struct sockaddr_storage cliaddr;
+	socklen_t cliaddr_len = sizeof(struct sockaddr_storage);
+	char host[NET_BUFFERSIZE];
+	char port[NET_BUFFERSIZE];
+	TCP *tcp = NULL;
+
+	if (sock <= 0) return NULL;
+
+	FD_ZERO(&rfds);
+    FD_SET(sock, &rfds);
+    tv.tv_sec = 0;
+    tv.tv_usec = 1000;
+
+	retval = select (sock+1,  &rfds, NULL, NULL, &tv);
+	if (retval == -1 && errno == EINTR) {
+		retval = 0;
+	}
+	else if (retval == -1) {
+		return NULL;
+	}
+	else if (retval) {
+#if defined(_WIN32) || defined(_WIN64) || defined(__CYGWIN__)
+		newsock = accept (sock, (struct sockaddr *) &cliaddr, (int*) &cliaddr_len);
+#else
+		newsock = accept (sock, (struct sockaddr *) &cliaddr, &cliaddr_len);
+#endif
+		if (newsock < 0) return NULL;
+		tcp = new TCP();
+		tcp->SetSocket(newsock, &cliaddr, cliaddr_len);
+
+		return tcp;
+	}
+	return NULL;
+}
+
+
+int TCP::Connect(string h, string p) {
+	int i = 0;
+
+	remote_host = h;
+	remote_port = p;
+
+    return Connect();
+};
+
+
+int TCP::Connect(string hostport, int defaultport) {
+	char buffer[32];
+	int pos = hostport.rfind(':', hostport.length());
+	if (pos == -1) {
+		remote_port = itoa (buffer, defaultport, 32);
+		remote_host = hostport;
+	}
+	else {
+		remote_port = hostport.substr (pos+1, hostport.length() - pos);
+		remote_host = hostport.substr (0, pos);
+	}
+
+	return Connect();
+};
+
+
+int TCP::Connect() {
+	int err, s;
+    struct addrinfo hints, *res, *rp;
+	struct timeval timeout;
+
+    memset(&hints, 0, sizeof(struct addrinfo));
+    hints.ai_family = AF_UNSPEC;   		// use IPv4 or IPv6
+    hints.ai_socktype = SOCK_STREAM;
+    hints.ai_flags = 0;
+    hints.ai_protocol = 0;
+
+    err = getaddrinfo(remote_host.c_str(), remote_port.c_str(), &hints, &res);
+    if (err != 0) {
+        fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(s));
+        return 0;
+    }
+
+    //
+    // walk through all results until we could connect
+    //
+    for (rp = res; rp != NULL; rp = rp->ai_next) {
+        s = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
+
+		// setup timeout to max 2 secs
+		timeout.tv_sec = 2;
+		timeout.tv_usec = 0;
+		setsockopt(s, SOL_SOCKET, SO_SNDTIMEO, (char*)&timeout, sizeof(timeout));
+		
+        if (s == -1) continue;
+        if (connect(s, rp->ai_addr, rp->ai_addrlen) != -1) {
+			sock = s;
+			break;
+		}
+        close(s);
+    }
+
+    freeaddrinfo(res);
+
+    //
+    // connect not successfull
+    //
+    if (rp == NULL) return 0;
+
+	writecnt = 0;
+	readcnt = 0;
+
+    return 1;
+};
+
+
+long int TCP::ReadPop (char *buffer, long int pktlen, long int bufferlen) {
+	memmove (buffer, buffer+pktlen, bufferlen-pktlen);
+	return bufferlen-pktlen;
+}
+
+
+long int TCP::Read(char *buffer, long int len) {
+    long int len_ = len;
+
+    if (sock <= 0) return -2;
+    len_ = recv (sock, buffer, len, 0);
+
+    if (len_ < 0 && errno == EAGAIN) len_ = 0;
+    else if (len_ < 0 && errno != EAGAIN) {
+#ifdef BUILD_WINDOWS
+        printf ("%s ERROR:%s\n", __FUNCTION__, strerror (errno));
+#else
+    	fprintf (stderr, "%s ERROR:%s\n", __FUNCTION__, strerror (errno));
+#endif
+        len_ = -2;
+    }
+    else if (len_ == 0) len_ = -1;
+    if (len_ < 0) Close();
+
+	readcnt += len_;
+
+    return len_;
+};
+
+
+long int TCP::ReadTimeout(char *buffer, long int len, int timeout) {
+	int data = IsData (timeout);
+
+	if (data > 0) return Read (buffer, len);
+	else if (data < 0) return -1;
+	else return 0;
+};
+
+
+//////////////////////////////////////////////////////////
+//
+// write data, generate no signal if some error occures
+long int TCP::Write(char *buffer, long int len) {
+	int i;
+	int to = NET_MAX_RETRY;
+
+	if (sock <= 0) return -1;
+
+	do {
+		i = send (sock, buffer, len, MSG_NOSIGNAL);
+	} while (i == -1 && (to--) > 0 && errno == EINTR);
+
+	if (i < 0) Close ();
+	writecnt += i;
+
+    return i;
+};
+
+
+void TCP::Close() {
+#ifdef BUILD_WINDOWS
+	closesocket(sock);
+#else
+	if (sock > 0)	close (sock);
+#endif
+    sock = -1;
+    islisten = false;
+};
+
+
+void TCP::SetSocket(SOCKET s, struct sockaddr_storage *saddr, socklen_t saddrlen) {
+	char host[NET_HOSTLEN];
+	char port[NET_PORTLEN];
+	int err;
+
+	if (sock > 0) Close();
+	if (s > 0) {
+		sock = s;
+
+		if (saddr != NULL) {
+			memcpy (&peeraddr, saddr, sizeof(peeraddr));
+			if ((err = getnameinfo ((struct sockaddr*) saddr, saddrlen, host, NET_HOSTLEN,
+					port, NET_PORTLEN, NI_NUMERICHOST | NI_NUMERICSERV)) == 0) {
+				remote_host = host;
+				remote_port = port;
+			} else {
+				printf ("error: getnameinfo");
+/*				if (err == EAI_AGAIN) printf ("EAI_AGAIN\n");
+				if (err == EAI_BADFLAGS) printf ("EAI_BADFLAGS\n");
+				if (err == EAI_FAIL) printf ("EAI_FAIL\n");
+				if (err == EAI_FAMILY) printf ("EAI_FAMILY\n");
+				if (err == EAI_MEMORY) printf ("EAI_MEMORY\n");
+				if (err == EAI_NONAME) printf ("EAI_NONAME\n");
+				if (err == EAI_OVERFLOW) printf ("EAI_OVERFLOW\n");
+				if (err == EAI_SYSTEM) printf ("EAI_SYSTEM\n");  */    // windows seem to have different error codes
+			}
+		}
+	}
+	else sock = -1;
+};
+
+
+int TCP::IsConnected() {
+	return (sock > 0);
+};
+
+
+int TCP::IsData(int timeout) {
+	fd_set sockset;
+	struct timeval tval;
+
+    if (sock <= 0) return -1;
+
+    FD_ZERO (&sockset);
+    FD_SET (sock, &sockset);
+    tval.tv_sec = timeout / 1000;
+    tval.tv_usec = (timeout % 1000);
+    if ((select (sock + 1, &sockset, NULL, NULL, &tval)) != -1) {
+    	if (FD_ISSET (sock, &sockset)) return 1;
+    	return 0;
+    }
+    else {
+    	if (errno == EBADF) sock = -1;
+    }
+    return 0;
+};
+
+
+int TCP::WebGetFile (string url, char *buffer, int maxsize) {
+	char outdata[NET_BUFFERSIZE];
+	char indata[NET_BUFFERSIZE];
+	char host[NET_HOSTLEN];
+	char port[NET_PORTLEN];
+	int breakup, len, head, i, buffpos = 0;
+
+	if (!IsConnected()) {
+		strncpy (host, WebGetURLHost (url).c_str(), NET_HOSTLEN);
+		strncpy (port, WebGetURLPort (url).c_str(), NET_PORTLEN);
+		Connect (host, port);
+	}
+
+	if (!IsConnected()) return -1;
+
+	// send http request
+	snprintf (outdata, NET_BUFFERSIZE, "GET %s HTTP/1.0\nUser-Agent: unknown \nHost: %s\n\n", WebGetURLFile (url).c_str(), host);
+	Write (outdata, strlen (outdata));
+
+	// wait for data start
+	i = breakup = 0;
+	head = 1;
+	while (!breakup && head && (len = ReadTimeout (indata, NET_BUFFERSIZE-1, 2000)) >= 0) {
+		indata[len] = 0;
+		while (i < len -4 && head && !breakup) {
+			if (indata[i] == 0x0d && indata [i+1] == 0x0a && indata [i+2] == 0x0d && indata [i+3] == 0x0a) {
+				head = 0;
+				i = i + 4;
+				buffpos = len-i;
+				if (buffpos > maxsize) buffpos = maxsize;
+				memcpy (buffer, indata+i, buffpos);
+			}
+
+			else if (strncmp (indata+i, "Content-Length:", 15) == 0) {
+				i = i + 16;
+			}
+
+			else if (strncmp (indata+i, "403 ", 4) == 0) breakup = 1;
+			else i++;
+		}
+	}
+
+	// read data
+	while (!breakup && (len = ReadTimeout (indata, NET_BUFFERSIZE-1, 2000)) >= 0) {
+		i = len;
+		if (i > maxsize-buffpos) i = maxsize-buffpos;
+		if (i > 0) {
+			memcpy (buffer+buffpos, indata, i);
+			buffpos += i;
+		}
+	}
+
+	return buffpos;
+};
+
+const string TCP::WebGetURLHost (string url) {
+	string result;
+	int posSServPort = 7;	// begin server:port
+	int posEServPort = 0;	// end Server:Port
+	int posPort = -1;		// port Position
+
+	posEServPort = url.find("/", 7);
+	result = url.substr (posSServPort, posEServPort-posSServPort);
+	posPort = result.find(":");
+	if (posPort > 0)
+		result = url.substr (posSServPort, posPort);
+
+	return result;
+};
+
+const string TCP::WebGetURLPort (string url) {
+	string result;
+	int posSServPort = 7;	// begin server:port
+	int posEServPort = 0;	// end Server:Port
+	int posPort = -1;		// port Position
+
+	posEServPort = url.find("/", 7);
+	result = url.substr (posSServPort, posEServPort-posSServPort);
+	posPort = result.find(":");
+	if (posPort > 0)
+		result = result.substr (posPort+1);
+	else
+		result = "80";
+
+	return result;
+};
+
+const string TCP::WebGetURLFile (string url) {
+	string result;
+	int posEServPort = 0;	// end Server:Port
+
+	posEServPort = url.find("/", 7);
+	result = url.substr (posEServPort);
+
+	return result;
+};
+
+
+const string TCP::GetRemoteAddr() {
+	string ret = "";
+	socklen_t addrlen = sizeof (peeraddr);
+	char host[256] = "";
+	char port[256] = "";
+
+	if (getnameinfo ((struct sockaddr*)&peeraddr, addrlen, host, 255, port, 255, NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
+		printf ("getnameinfo error: %s\n", strerror(errno));
+	}
+
+	ret = (string)host + ":" + (string)port;
+
+	return ret;
+};
+
+
+const string TCP::GetLocalAddr() {
+	string ret;
+
+	return ret;
+};
+
+
--- a/tcp.h
+++ b/tcp.h
@ -0,0 +1,123 @@
+///////////////////////////////////////////////////////////////////////////////// 
+//
+// tcp.h is part of TestModbus-Server.
+//
+///////////////////////////////////////////////////////////////////////////////// 
+
+#ifndef _TCP_H_
+#define _TCP_H_
+
+#if defined(_WIN32) || defined(_WIN64) || defined(__CYGWIN__)
+
+#define WIN32_LEAN_AND_MEAN
+
+#define _NTDDI_VERSION_FROM_WIN32_WINNT2(ver)    ver##0000
+#define _NTDDI_VERSION_FROM_WIN32_WINNT(ver)     _NTDDI_VERSION_FROM_WIN32_WINNT2(ver)
+
+#ifndef _WIN32_WINNT
+#  define _WIN32_WINNT 0x501
+#endif
+#ifndef NTDDI_VERSION
+#  define NTDDI_VERSION _NTDDI_VERSION_FROM_WIN32_WINNT(_WIN32_WINNT)
+#endif
+
+// #include <winsock.h>
+#include <winsock2.h>
+#include <io.h>
+#include <ws2tcpip.h>
+#include <string.h>
+
+#define socklen_t size_t
+
+#ifndef bzero
+#define bzero(__z__, __x__) memset (__z__, 0x0, __x__)
+#endif
+
+#ifndef MSG_NOSIGNAL
+# define MSG_NOSIGNAL 0
+#endif
+
+#else
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <sys/un.h>
+
+#endif
+
+#include <string>
+
+using namespace std;
+
+#define SOCKET int
+
+#define NET_HOSTLEN 256
+#define NET_PORTLEN 6
+#define NET_BUFFERSIZE 1024
+#define NET_MAX_RETRY 5					// retry to send data EINTR
+#define NET_MAX_TIMEOUT 30000			// timeout in ms
+
+
+/************************************************************************
+ *
+ * global functions needed for networking
+ *
+ */
+int dns_filladdr (string host, string port, int ai_family,
+		struct sockaddr_storage *sAddr);
+char *itoa(char* buffer, int number, int size);
+void UDPTCPNetwork_Startup();
+extern int UDPTCPNetwork_init;
+
+
+/************************************************************************
+ * tcp related functions
+ */
+class TCP {
+private:
+	SOCKET sock;
+	struct sockaddr_storage peeraddr;
+	string remote_host;
+	string remote_port;
+	int readcnt;
+	int writecnt;
+	int islisten;
+public:
+	TCP();
+	TCP(SOCKET s);
+	TCP(string h, string p);
+	TCP(string hostport, int defaultport);
+	~TCP();
+
+	int Connect();
+	int Connect(string h, string p);
+	int Connect(string hostport, int defaultport);
+	long int ReadPop (char *buffer, long int pktlen, long int bufferlen);
+	long int ReadTimeout(char *buffer, long int len, int timeout);
+	long int Read(char *buffer, long int len);
+	long int Write(char *buffer, long int len);
+	void Close();
+	int IsConnected();
+	int IsData(int timeout);	// timeout in ms;
+	int IsListen() { return islisten; };
+
+	int Listen(int port);
+	TCP* Accept();
+
+	SOCKET GetSocket() { return sock; };
+	void SetSocket(SOCKET s, struct sockaddr_storage *saddr, socklen_t saddrlen);
+
+	const string GetRemoteAddr();
+	const string GetLocalAddr();
+
+	const string WebGetURLHost (string url);
+	const string WebGetURLPort (string url);
+	const string WebGetURLFile (string url);
+	int WebGetFile (string url, char *buffer, int maxsize);
+};
+
+#endif
+
--- a/test-fc15.cc
+++ b/test-fc15.cc
@ -0,0 +1,110 @@
+///////////////////////////////////////////////////////////////////////////////// 
+//
+// test-fc15.cc is part of TestModbus-Server.
+//
+///////////////////////////////////////////////////////////////////////////////// 
+
+#include <UDPTCPNetwork.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define SIZE_BUFFER 4096
+int main (int argc, char **argv) {
+	unsigned char data[] = {	0x00,0x70,0x00,0x00 , 0x00,0x0B,0x01,0x10 ,
+								0x00,0x04,0x00,0x02 , 0x04,0xC0,0x02,0x7B ,
+								0xA5 };
+
+	char buffer[SIZE_BUFFER];
+	int pos;
+	TCP tcp;
+	int port;
+	int i,c;
+	int regstart;
+	int regcnt;
+	uint8_t ui8;
+	uint16_t ui16;
+	float f;
+
+	memset (buffer, 0x00, SIZE_BUFFER);
+
+	if (argc < 3) {
+		printf("test-fc15 server port register values.[01010101]..\n");
+		printf("test-fc15 localhost 502 16 1111100000001010000\n");
+		return 0;
+	}
+
+	port = atoi (argv[2]);
+	printf ("%d connecting to: %s:%d\n", argc, argv[1], port);
+	if (tcp.Connect(argv[1], port) != 1) {
+		printf ("could not connect.\n");
+		return -1;
+	}
+
+	if (argc == 3) {
+		tcp.Write((char*)data, sizeof(data));
+	}
+	else if (argc > 4) {
+		regstart = atoi (argv[3]);
+		regcnt = strlen(argv[4]);
+
+		printf ("writing %d floats, offset %d\n", regcnt, regstart);
+
+		// construct modbus protocol
+		pos = 0;
+
+		// transact id
+		ui16 = 0;
+		memcpy (buffer+pos, &ui16, sizeof(ui16));
+		pos += sizeof(ui16);
+
+		// proitocol id
+		ui16 = 0;
+		memcpy (buffer+pos, &ui16, sizeof(ui16));
+		pos += sizeof(ui16);
+
+		// lenght
+		ui16 = htons(4 + regcnt/8);
+		memcpy (buffer+pos, &ui16, sizeof(ui16));
+		pos += sizeof(ui16);
+
+		// device id
+		ui8 = 1;
+		memcpy (buffer+pos, &ui8, sizeof(ui8));
+		pos += sizeof(ui8);
+
+		// function code
+		ui8 = 15;
+		memcpy (buffer+pos, &ui8, sizeof(ui8));
+		pos += sizeof(ui8);
+
+		// starting address
+		ui16 = htons((uint16_t)regstart);
+		memcpy (buffer+pos, &ui16, sizeof(ui16));
+		pos += sizeof(ui16);
+
+		// number of registers
+		ui16 = htons((uint16_t)regcnt);
+		memcpy (buffer+pos, &ui16, sizeof(ui16));
+		pos += sizeof(ui16);
+
+		// number of bytes
+		ui8 = regcnt*4;
+		memcpy (buffer+pos, &ui8, sizeof(ui8));
+		pos += sizeof(ui8);
+
+		buffer[pos] = 0;
+		for (i = 0; i < regcnt; i++) {
+			if (i > 0 && i % 8 == 0) {
+				pos++;
+				buffer[pos] = 0;
+			}
+			if (argv[4][i] == '1')	buffer[pos] |= (1 << i%8);
+		}
+		pos++;
+
+		tcp.Write((char*)buffer, pos);
+	}
+	tcp.Close();
+
+	return 0;
+};
--- a/test-fc16.cc
+++ b/test-fc16.cc
@ -0,0 +1,115 @@
+///////////////////////////////////////////////////////////////////////////////// 
+//
+// test-fc16.cc is part of TestModbus-Server.
+//
+///////////////////////////////////////////////////////////////////////////////// 
+
+#include <UDPTCPNetwork.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define SIZE_BUFFER 4096
+int main (int argc, char **argv) {
+	unsigned char data[] = {	0x00,0x70,0x00,0x00 , 0x00,0x0B,0x01,0x10 ,
+								0x00,0x04,0x00,0x02 , 0x04,0xC0,0x02,0x7B ,
+								0xA5 };
+
+	char buffer[SIZE_BUFFER];
+	int pos;
+	TCP tcp;
+	int port;
+	int i,c;
+	int regstart;
+	int regcnt;
+	uint8_t ui8;
+	uint16_t ui16;
+	float f;
+
+	memset (buffer, 0x00, SIZE_BUFFER);
+
+	if (argc < 3) {
+		printf("test-fc16 server port register values...\n");
+		printf("test-fc16 localhost 502 16 25.0 0.54 1000.5\n");
+		return 0;
+	}
+
+	port = atoi (argv[2]);
+	printf ("%d connecting to: %s:%d\n", argc, argv[1], port);
+	if (tcp.Connect(argv[1], port) != 1) {
+		printf ("could not connect.\n");
+		return -1;
+	}
+
+	if (argc == 3) {
+		tcp.Write((char*)data, sizeof(data));
+	}
+	else if (argc > 4) {
+		regstart = atoi (argv[3]);
+		regcnt = argc-4;
+
+		printf ("writing %d floats, offset %d\n", regcnt, regstart);
+
+		// construct modbus protocol
+		pos = 0;
+
+		// transact id
+		ui16 = 0;
+		memcpy (buffer+pos, &ui16, sizeof(ui16));
+		pos += sizeof(ui16);
+
+		// proitocol id
+		ui16 = 0;
+		memcpy (buffer+pos, &ui16, sizeof(ui16));
+		pos += sizeof(ui16);
+
+		// lenght
+		ui16 = htons(3 + regcnt*4);
+		memcpy (buffer+pos, &ui16, sizeof(ui16));
+		pos += sizeof(ui16);
+
+		// device id
+		ui8 = 1;
+		memcpy (buffer+pos, &ui8, sizeof(ui8));
+		pos += sizeof(ui8);
+
+		// function code
+		ui8 = 16;
+		memcpy (buffer+pos, &ui8, sizeof(ui8));
+		pos += sizeof(ui8);
+
+		// starting address
+		ui16 = htons((uint16_t)regstart);
+		memcpy (buffer+pos, &ui16, sizeof(ui16));
+		pos += sizeof(ui16);
+
+		// number of registers
+		ui16 = htons((uint16_t)regcnt*2);
+		memcpy (buffer+pos, &ui16, sizeof(ui16));
+		pos += sizeof(ui16);
+
+		// number of bytes
+		ui8 = regcnt*4;
+		memcpy (buffer+pos, &ui8, sizeof(ui8));
+		pos += sizeof(ui8);
+
+		for (i = 0; i < regcnt; i++) {
+			f = (float) atof(argv[i+4]);
+			printf ("i: %d  string:%s   f:%f\n", i, argv[i+4], f);
+
+			memcpy (&ui16, &f, sizeof(ui16));
+			ui16 = htons(ui16);
+			memcpy (buffer+pos, &ui16, sizeof(ui16));
+			pos += sizeof(ui16);
+
+			memcpy (&ui16, ((char*)&f +2), sizeof(ui16));
+			ui16 = htons(ui16);
+			memcpy (buffer+pos, &ui16, sizeof(ui16));
+			pos += sizeof(ui16);
+		}
+
+		tcp.Write((char*)buffer, pos);
+	}
+	tcp.Close();
+
+	return 0;
+};
--- a/testmodbus-server.png
+++ b/testmodbus-server.png
--- a/testmodbus-server.ui
+++ b/testmodbus-server.ui