diff --git a/server.cc b/server.cc
new file mode 100644
index 0000000..8e08332
--- /dev/null
+++ b/server.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;
+ModbusSrv modbussrv;
+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
+	//
+
+	modbussrv.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;
+}