bluetooth/btstack/rfcomm/rfcommframe.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 15 Jan 2010 08:13:17 +0200
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// Copyright (c) 2000-2009 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:
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//
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#ifndef RFCOMMFRAME_H
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#define RFCOMMFRAME_H
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#include <e32base.h>
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#include "rfcommsap.h"
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#include "rfcommconsts.h"
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#include "btsockettimer.h"
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/**
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   Abstract base class for the different Rfcomm frame types
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   All RFCOMM (TS07.10) frames have the following format:
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   @verbatim
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   Field  | Address  |  Control | Length       | Data        | FCS     |
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   Length |   1 byte |  1 byte  | 1 or 2 bytes | 0..* bytes  | 1 byte  |
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   @endverbatim
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   Classes derived from this one provide a typeId so that the
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   appropriate matching can be done when working out which command a
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   response is for, since this depends on the type of the frame.
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   All frames have the notion of whether they need a response, and
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   also have an associated response timer if necessary.
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**/
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NONSHARABLE_CLASS(CRfcommFrame) : public CBase
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	{
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friend class CRfcommMuxer;
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public:
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	CRfcommFrame(CRfcommMuxer& aMux, CRfcommSAP* aSAP);
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	CRfcommFrame(CRfcommMuxer& aMux);
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	virtual ~CRfcommFrame();
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	void SetAddress(TUint8 aChan);
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	TUint8 Address() const;
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	void SetControl(TUint8 aCtrl);
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	TUint8 Ctrl() const;
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	virtual TUint8 Credit() const;
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	virtual void SetCredit(TUint8 aCredit);
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	virtual TUint16 DataLength() const;
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	CRfcommSAP* SAP() const;
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	virtual const TDesC8& Data() =0;
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	virtual TInt Type() const =0;
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	virtual TBool ResponseNeeded() =0;
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	virtual void QueResponseTimer() =0;
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	virtual void DequeTimer() =0;
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	virtual TBool Priority() const =0;
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protected:
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	TUint8 iAddr;
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	TUint8 iCtrl;
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	CRfcommMuxer& iMuxer;	//< The muxer this frame belongs to
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	CRfcommSAP*  iSAP;		//< The sap this frame belongs to, if any - could be NULL
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	TDblQueLink iLink;
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	};
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/**
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   Represents the non-data frames that exist in RFCOMM
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   These types are as follows:
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   SABM :  Creates a channel
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   UA   :  Acknowledgement
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   DM   :  Disconnected mode - sent for a channel that is not on
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   DISC :  Disconnects a channel
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   FCS is calculated using a polynomial CRC.
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   All these frames have a length of 0 and no user data.
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   SABM and DISC frames require a response, so objects of this class
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   have associated timer entries
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**/
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NONSHARABLE_CLASS(CRfcommCtrlFrame) : public CRfcommFrame
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	{
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public:
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	CRfcommCtrlFrame(CRfcommMuxer& aMux, CRfcommSAP* aSAP);
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	CRfcommCtrlFrame(CRfcommMuxer& aMux);
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	~CRfcommCtrlFrame();
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	void SetResponseNeeded(TBool aNeed);
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	virtual const TDesC8& Data();
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	virtual TInt Type() const;
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	virtual TBool ResponseNeeded();
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	virtual void QueResponseTimer();
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	virtual void DequeTimer();
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	virtual TBool Priority() const;
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private:
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	static TInt TimerExpired(TAny* aFrame);
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	TBool						iResponseNeeded;
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	TDeltaTimerEntry			iTimerEntry;
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	TBool						iTimerQueued;
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	TBuf8<KRfcommCtrlFrameSize> iData;
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	};
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/**
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   Represents a data frame in RFCOMM
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   UIH frames carry both user data and mux commands between the
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   endpoints.  Thus this class is the base for mux ctrl frames.
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   A simple, stream-like store API is defined so that subsequent
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   writes occur further into the packet than earlier ones.
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//   Note that with this implementation only single byte lengths are
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//   supported, and a fixed sized buffer is used to contain the data.
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// Mel no longer true but we have to  reorganise this to remove the dependency
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// of Ctrl frames on data frames
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**/
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NONSHARABLE_CLASS(CRfcommUIHFrame) : public CRfcommFrame
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	{
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public:
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	static CRfcommUIHFrame* NewL(TInt aInformationLength, CRfcommMuxer& aMux, CRfcommSAP* aSAP=0);
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	virtual ~CRfcommUIHFrame();
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	virtual void PutByte(TUint8 aByte);
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	virtual void PutLittleEndian16(TUint16 aShort);
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	virtual void PutLittleEndian32(TUint32 aLong);
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	virtual void PutData(const TDesC8& aDes);
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	virtual const TDesC8& Data();
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	virtual TInt Type() const;
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	virtual TBool ResponseNeeded();
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	virtual void QueResponseTimer();
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	virtual void DequeTimer();
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	virtual TBool Priority() const;
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	virtual TUint16 DataLength() const;
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protected:
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	CRfcommUIHFrame(CRfcommMuxer& aMux, CRfcommSAP* aSAP);
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	//	Called as part of NewL
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	virtual void ConstructDataBufferL(TInt aInformationLength);
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	virtual void PrepareDataFrame();
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	void PutByteAt(TInt aOffset, TUint8 aByte);
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protected:
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	HBufC8*	iData;
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	TPtrC8	iReturnedFrame;
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	TBool iFramePrepared;
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	};
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/**
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   Represents a UIH frame in RFCOMM which is used for carrying information  
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**/
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NONSHARABLE_CLASS(CRfcommDataFrame) : public CRfcommUIHFrame
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	{
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public:
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	static CRfcommDataFrame* NewL(TInt aInformationLength, CRfcommMuxer& aMux, CRfcommSAP* aSAP=0);
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	virtual ~CRfcommDataFrame();
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protected:
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	CRfcommDataFrame(CRfcommMuxer& aMux, CRfcommSAP* aSAP);
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	//	Called as part of NewL
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	virtual void ConstructDataBufferL(TInt aInformationLength);
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	virtual void PrepareDataFrame();
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	};
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/**
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   Represents a data frame in RFCOMM which also carries a credit  
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**/
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NONSHARABLE_CLASS(CRfcommCreditDataFrame) : public CRfcommDataFrame
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	{
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public:
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	static CRfcommCreditDataFrame* NewL(TInt aInformationLength, CRfcommMuxer& aMux, CRfcommSAP* aSAP=0);
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	virtual ~CRfcommCreditDataFrame();
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	virtual TInt Type() const;
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	virtual TUint16 DataLength() const;
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	virtual void SetCredit(TUint8 aCredit);
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	virtual TUint8 Credit() const;
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protected:
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	CRfcommCreditDataFrame(CRfcommMuxer& aMux, CRfcommSAP* aSAP);
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	//	Called as part of NewL
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	virtual void ConstructDataBufferL(TInt aInformationLength);
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	virtual void PrepareDataFrame();
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private:
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	TUint8 iCredit;	// what we are doling out this frame
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	};
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/**
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   Represents mux control channel commands and responses
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   These are carried in UIH frames, but as commands require responses
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   the infrastructure for these has been added.
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 **/
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NONSHARABLE_CLASS(CRfcommMuxCtrlFrame) : public CRfcommUIHFrame
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	{
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friend class CRfcommMuxer;
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public:
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	static CRfcommMuxCtrlFrame* NewL(TUint8 aCommandValuesLength, CRfcommMuxer& aMux, CRfcommSAP* aSAP=0);
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	~CRfcommMuxCtrlFrame();
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	void SetCommandType(TUint8 aType, TBool aCommand);
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	TUint8 CommandType() const;
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	void SetResponseNeeded(TBool aNeed);
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	virtual TInt Type() const;
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	virtual TBool ResponseNeeded();
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	virtual void QueResponseTimer();
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	virtual void DequeTimer();
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	virtual TBool Priority() const;
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	//	NB. MuxCtrlFrames are always sent on DLCI 0 (i.e. the Mux Control Channel).
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	//	The SetDLCI / DLCI members refer to the actual channel which is being addressed,
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	//	rather than the channel on which this frame is being sent.
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	//
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	void SetDLCI(TUint8 aDLCI);
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	TUint8 DLCI() const;
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protected:
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	//	Called as part of NewL
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	virtual void ConstructDataBufferL(TInt aCommandValuesLength);
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	virtual void PrepareDataFrame();
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private:
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	CRfcommMuxCtrlFrame(TUint8 aCommandValuesLength, CRfcommMuxer& aMux, CRfcommSAP* aSAP);
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	static TInt TimerExpired(TAny* aFrame);
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	TBool iResponseNeeded;
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	TUint8 iCommandType;
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	TUint8 iCommandLength;
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	TDeltaTimerEntry iTimerEntry;
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	TBool iTimerQueued;
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	TUint8 iDLCI;
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	};
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#include "rfcommframe.inl"
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#endif