--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/natfw/natfwclient/inc/mnatfwpluginobserver.h	Tue Feb 02 01:04:58 2010 +0200
@@ -0,0 +1,118 @@
+/*
+* Copyright (c) 2006-2007 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:    Callback hook for the plug-ins to the client
+*
+*/
+
+
+
+
+#ifndef M_MNATFWPLUGINONSERVER_H
+#define M_MNATFWPLUGINONSERVER_H
+
+#include <e32base.h>
+
+class CNATFWPluginApi;
+class CNATFWCandidatePair;
+class CNATFWCandidate;
+
+/**
+ *  Observer interface for clients to receive events from NAT-plugin.
+ *
+ *  @lib natconfw.lib
+ *  @since S60 v3.2
+ */
+class MNATFWPluginObserver
+    {
+
+public:
+    
+    /** NAT-plugin events. */
+    enum TNATFWPluginEvent
+        {
+        /** Completing event for ConnectServerL. */
+        EServerConnected        = 1,
+        
+        /** Completing event for FetchCandidate(s). */
+        EFetchingCompleted      = 2,
+        
+        /** Completing event for SetupTcpConnectionL. */
+        ETcpConnSetupCompleted  = 3,
+        
+        /** Completing event for SetReceivingStateL. */
+        EReceivingActivated     = 4,
+        
+        /** Completing event for SetReceivingStateL. */
+        EReceivingDeactivated   = 5,
+        
+        /** Completing event for SetSendingStateL. */
+        ESendingActivated       = 6,
+        
+        /** Completing event for SetSendingStateL. */
+        ESendingDeactivated     = 7,
+        
+        /** Completing event for PerformConnectivityChecksL. */
+        EConnChecksCompleted    = 8
+        };
+    
+    /**
+     * Called when an error within a stream has occured and no
+     * asynchronous operation is ongoing. Error during asynchronous
+     * operation is reported by completing operation with error code.
+     * 
+     * @since   S60 v3.2
+     * @param   aPlugin         The plugin raising event
+     * @param   aStreamId       The ID identifying stream
+     * @param   aErrorCode      Standard system wide error code
+     */
+    virtual void Error( const CNATFWPluginApi& aPlugin,
+        TUint aStreamId, TInt aErrorCode ) = 0;
+    
+    /**
+     * Notifies the client of plugin events.
+     *
+     * @since   S60 v3.2
+     * @param   aPlugin         The plugin raising event
+     * @param   aStreamId       The ID identifying stream
+     * @param   aEvent          The event
+     * @param   aErrCode        Standard system wide error code
+     */
+    virtual void Notify( const CNATFWPluginApi& aPlugin,
+        TUint aStreamId, TNATFWPluginEvent aEvent, TInt aErrCode ) = 0;
+    
+    /**
+     * Called when working candidate pair has been found. Ownership of
+     * the candidate pair is transferred.
+     *
+     * @since   S60 v3.2
+     * @param   aPlugin         The plugin raising event
+     * @param   aCandidatePair  The candidate pair which was found
+     */
+    virtual void NewCandidatePairFound( const CNATFWPluginApi& aPlugin,
+        CNATFWCandidatePair* aCandidatePair ) = 0;
+    
+    /**
+     * Called when a new local candidate has been found. Ownership of the
+     * candidate is transferred.
+     *
+     * @since   S60 v3.2
+     * @param   aPlugin         The plugin raising event
+     * @param   aCandidate      The local candidate that was found
+     */
+    virtual void NewLocalCandidateFound( const CNATFWPluginApi& aPlugin,
+        CNATFWCandidate* aCandidate ) = 0;
+    };
+
+
+#endif // M_MNATFWPLUGINONSERVER_H