hti/HtiCommPlugins/HtiBtCommPlugin/BtEngine/inc/BtSerialClient.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:57:15 +0200
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/*
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  Bluetooth serial client.
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*
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*/
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#ifndef __BTSERIALCLIENT_H__
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#define __BTSERIALCLIENT_H__
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// INCLUDES
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#include <e32base.h>
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#include <es_sock.h>
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#include <bluetooth/btpowercontrol.h>
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#include <bt_sock.h>
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#include <BTextNotifiers.h>
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#include <BtSdp.h>
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#include "SocketObserver.h"
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// FORWARD DECLARATIONS
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class CMessageServiceSearcher;
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class CSocketsReader;
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class CSocketsWriter;
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class MBtSerialClientObserver
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    {
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public:
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    virtual void ConnectedToServer(TInt aError) = 0;
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    virtual void DisconnectedFromServer() = 0;
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    virtual void DataFromServer(const TDesC8& aData) = 0;
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    virtual void AllBufferedDataSent() = 0;
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    };
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/**
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* CBtSerialClient
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* Connects and sends messages to a remote machine using bluetooth
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*/
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class CBtSerialClient : public CActive,
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                        public MSocketObserver
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    {
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    public: // Constructors and destructor
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        /**
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        * NewL()
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        * Construct a CBtSerialClient
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        * @param aObserver the observer for this BT serial client
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        * @return a pointer to the created instance of CBtSerialClient
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        */
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        IMPORT_C static CBtSerialClient* NewL( MBtSerialClientObserver& aObserver );
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        /**
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        * ~CBtSerialClient()
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        * Destroy the object and release all memory objects.
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        * Close any open sockets.
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        */
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        IMPORT_C virtual ~CBtSerialClient();
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    public:     // New functions
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        /**
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        * ConnectL()
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        * Connect to remote device. Query user for a device.
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        */
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        IMPORT_C void ConnectL();
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        /**
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        * ConnectL()
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        * Connect to remote device.
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        */
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        IMPORT_C void ConnectL(const TBTDevAddr aBTServerDevice, const TInt aPort );
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        /**
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        * ConnectL()
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        * Connect to remote device by device name.
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        */
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        IMPORT_C void ConnectL( const TDesC& aBTServerDeviceName, const TInt aPort );
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        /**
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        * DisconnectL()
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        * Disconnect from remote machine
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        */
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        IMPORT_C void Disconnect();
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        /**
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        * IsConnecting()
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        * @return ETrue if the client is establishing a
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        * connection to the server.
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        */
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        IMPORT_C TBool Connecting();
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        /**
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        * Connected()
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        * @return ETrue if the client is fully connected to the server.
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        */
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        IMPORT_C TBool Connected();
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        /**
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        * ServerAddressL()
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        * @return address of connected server. Leaves with KErrNotReady, if
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        * not connected.
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        */
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        TBTDevAddr ServerAddressL();
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        /**
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        * Add data to outgoing buffer and start sending it to client.
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        *
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        * Leaves with KErrOverflow, if the outgoing buffer cannot
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        * be added all of the aData.
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        * Leaves with KErrNotReady, if client is not connected.
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        * When all data in internal buffer has been sent, observer
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        * is notified (AllBufferedDataSent)
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        */
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        IMPORT_C void SendL(const TDesC8& aData);
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   126
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        /**
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        * Issue read operation. Will complete asyncronously.
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        *
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        * Leaves with KErrNotReady, if client is not connected.
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        * Notifies observer, when some data has been read. Caller
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        * is responsible for calling this method again to receive
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        * more data.
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        */
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        IMPORT_C void ReadAsyncL();
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   136
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        /**
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        * Query free size of outgoing buffer.
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        */
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        IMPORT_C TInt FreeSpaceInSendBuffer();
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   141
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        /**
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        * Query max size of outgoing buffer.
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        */
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        IMPORT_C TInt SendBufferMaxSize();
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   146
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        /**
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        * Query the port of the service we are connected with
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        * @return Port number or KErrDisconnected if not connected to a service
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        */
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        IMPORT_C TInt ServicePort();
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    protected:    // from CActive
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        /**
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        * DoCancel()
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        * Cancel any outstanding requests
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        */
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        void DoCancel();
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        /**
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        * RunL()
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        * Respond to an event
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        */
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        void RunL();
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    protected: // from MSocketObserver
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        void ReportError( TErrorType aErrorType, TInt aErrorCode );
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        void NewData( const TDesC8& aData );
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        void AllBufferedDataSent();
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    private:
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        /**
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        * ConnectToServerL
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        * Connects to the service
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        */
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        void ConnectToServerL();
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        /**
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        * DisconnectFromServer()
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        * Disconnects from the service
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        */
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        void DisconnectFromServer();
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        /**
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        * CBtSerialClient()
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        * Constructs this object
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        */
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        CBtSerialClient( MBtSerialClientObserver& aObserver );
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        /**
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        * ConstructL()
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        * Performs second phase construction of this object
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        */
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        void ConstructL();
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    private:    // data
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        /**
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        * TState
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        * The state of the active object, determines behaviour within
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        * the RunL method.
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        * EWaitingToGetDevice waiting for the user to select a device
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        * EGettingDevice searching for a device
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        * EGettingService searching for a service
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        * EGettingConnection connecting to a service on a remote machine
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        * EConnected connected to a service on a remote machine
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        */
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        enum TState
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            {
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            EWaitingToGetDevice,      // phase 1 of Connect
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            EGettingDevice,           // phase 2 of Connect
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            EGettingService,          // phase 3 of Connect
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            EGettingConnection,       // phase 4 of Connect
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            EConnected, // sending and receiving data
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            EDisconnecting
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            };
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        MBtSerialClientObserver& iObserver;
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        /** iState the current state of the client */
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        TState iState;
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        /**
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        * iServiceSearcher searches for service this
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        * client can connect to.
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        * Owned by CBtSerialClient
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        */
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        CMessageServiceSearcher* iServiceSearcher;
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        /**
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        * iCurrentServiceIndex the index number of the service we are
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        * currently connecting/connected to
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        */
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        TInt iCurrentServiceIndex;
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        /** iSocketServer a connection to the socket server */
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        RSocketServ iSocketServer;
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        /** iSocket a socket to connect with */
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        RSocket iSocket;
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        /** iServiceClass the service class UUID to search for */
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        TUUID iServiceClass;
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        TBTDevAddr iBTServerDevice;
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        CSocketsReader* iSocketReader;
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        CSocketsWriter* iSocketWriter;
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        RBTPowerControl iPowerControl;
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    };
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#endif // __BTSERIALCLIENT_H__
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// End of File