From 78bb5ea1fa3181818afc34a22ebb11730b322b1a Mon Sep 17 00:00:00 2001
From: Michele Cattafesta <michele.cattafesta@mesta-automation.com>
Date: Fri, 26 Aug 2016 12:29:23 +0200
Subject: [PATCH] plc: implemented shutdown of the socket correctly (Issue
 #29).

Signed-off-by: Michele Cattafesta <michele.cattafesta@mesta-automation.com>
---
 S7.Net.Core/SocketClient.cs | 6 +++++-
 S7.Net/PLC.cs               | 2 ++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/S7.Net.Core/SocketClient.cs b/S7.Net.Core/SocketClient.cs
index d704e26..a207f85 100644
--- a/S7.Net.Core/SocketClient.cs
+++ b/S7.Net.Core/SocketClient.cs
@@ -143,11 +143,15 @@ namespace S7.Net
             return response;
         }
 
+        public void Shutdown(SocketShutdown how)
+        {
+            _socket.Shutdown(how);
+        }
+
         public void Close()
         {
             if (_socket != null)
             {
-                _socket.Shutdown(SocketShutdown.Both);
                 _socket.Dispose();
                 _socket = null;
             }
diff --git a/S7.Net/PLC.cs b/S7.Net/PLC.cs
index f546dcb..3901f18 100644
--- a/S7.Net/PLC.cs
+++ b/S7.Net/PLC.cs
@@ -242,6 +242,7 @@ namespace S7.Net
         {
             if (_mSocket != null && _mSocket.Connected) 
             {
+                _mSocket.Shutdown(SocketShutdown.Both);
                 _mSocket.Close();
             }
         }
@@ -1096,6 +1097,7 @@ namespace S7.Net
                 if (_mSocket.Connected)
                 {
                     //Close() performs a Dispose on the socket.
+                    _mSocket.Shutdown(SocketShutdown.Both);
                     _mSocket.Close();
                 }
                 //((IDisposable)_mSocket).Dispose();