WAP Stack

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Created: eswar_illuri (23 May 2007)

Last edited: hamishwillee (26 Jul 2012)

Introduction

The WAP Stack uses the client/server framework. A single server provides WAP services which applications access through a client API.WAP server by itself refers to a remote server providing WAP content.The lowest level of the WAP protocol stack, the bearers, are implemented as plug-ins. SMS and IP are the standard bearers. There is no direct API to bearers.

Description

The API has five key concepts: Symbian WAP server, sub-session base class, WSP, and WDP.

Symbian WAP Server

The Symbian WAP server manages client access to WAP services.The client interface to the Symbian WAP server is provided by RWAPServ.

Sub-Session Base Class

The sub-session base class defines operations available on connections in all of WSP, WTP, and WDP. The sub-session base class is provided by RWAPConn.

WSP

WSP (Wireless Session Protocol) is the upper-level application layer of the WAP communications stack. Connection-orientated WSP is provided by RWSPCOConn. Supporting classes are CCapCodec, for capability negotiation, and RWSPCOTrans, which encapsulates an individual transaction. Connectionless WSP is provided by RWSPCLConn

WDP

WDP (Wireless Datagram Protocol) provides a general datagram transport service above the various data capable bearer services. WDP is provided by RWDPConn.

Sample Code

/* in class definition */
	RWAPServ	server;
	RWSPCOConn	connection;
	RWSPCOTrans	transaction;
	RWSPCOTrans	event_tx;
	RWSPCOConn::TEvent event;
 
/* in Connect() function */
	User::LeaveIfError(server.Connect());
 
	_LIT8(headers, "");
	iCap = CCapCodec::NewL();
	iCap->SetServerSDUSize(MAXSIZE+3000);
	iCap->SetClientSDUSize(MAXSIZE+3000);
 
	TBuf8<100> host;
	GetGwAddress(host);
	TInt port=9201;
	User::LeaveIfError(connection.Open(server, host, port, 0, EIP, EFalse));
	User::LeaveIfError(connection.Connect(headers, iCap));
 
	connection.GetEvent(event, event_tx, iStatus);
	SetActive();

void CWap::GetGwAddress(TDes8& addr)
{
	bool found=false;
 
	CCommsDatabase* db;
	db=CCommsDatabase::NewL(EDatabaseTypeIAP);
	CleanupStack::PushL(db);
 
	CCommsDbTableView *view=db->OpenTableLC(TPtrC(WAP_IP_BEARER));
 
	while (view->GotoNextRecord()==KErrNone) {
		TUint32 currid;
		view->ReadUintL(TPtrC(WAP_IAP), currid);
		if (currid==iIapId) {
			found=true;
			TBuf<100> tmp;
 
			view->ReadTextL(TPtrC(WAP_GATEWAY_ADDRESS), tmp);
 
			CC()->ConvertFromUnicode(addr, tmp);
			break;
		}
	}
 
	CleanupStack::PopAndDestroy(2); //db, view
 
	if (!found || !addr.Compare(_L8("0.0.0.0")) || addr.Length()==0) {
		User::Leave(-1004);
	} 
 
}

Download the WAP Stack example from here

Other Related Links

The Wireless Application Protocol