add modbus slave support

add modbus slave support

components/connectivity/Modbus/3rdparty/freemodbus-v1.6/demo/WIN32TCP/stdafx.h

@@ -0,0 +1,28 @@
+/*
+ * FreeModbus Libary: Win32TCP Demo Application
+ * Copyright (C) 2006 Christian Walter <wolti@sil.at>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * File: $Id$
+ */
+
+#pragma once
+
+#define WIN32_LEAN_AND_MEAN
+#include <stdio.h>
+#include <stdlib.h>
+#include <tchar.h>
+#include <windows.h>