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<concept xml:lang="en" id="GUID-3AB8E95D-4270-5CDE-994E-404BCBEC57B6"><title> Attaching to the default sub-connection: Tutorial</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>This tutorial describes how an application can use the <xref href="GUID-0AFDA357-EE44-3788-9CAB-162B874134BF.dita"><apiname>RSubConnection</apiname></xref> API to attach to the default sub-connection. </p> <p>In the following example, the application wants to connect to the default sub-connection to set its properties. The application simply tries to connect a socket over the connection (which uses the default sub-connection) after it has set properties on the default sub-connection. An example of parameter creation can be found in the separate tutorial <xref href="GUID-7FAE6FE0-D5CB-55D4-94B0-ADD545577CA7.dita">Creating and setting properties for a Sub-Connection</xref>. </p> <codeblock id="GUID-E57DB0E4-D23D-55E4-A7C5-83C15BDA0E43" xml:space="preserve">RSocketServ ss;

RConnection conn;

RSubConnection subconn;

RSocket sock;

TRequestStatus status;

// Connect to ESOCK

ss.Connect();

// Open an Connection

conn.Open(ss, KAfInet);

// Start the connection

conn.Start(status);

User::WaitForRequest(status);

// Attach to the default sub-connection

subconn.Open(ss, RSubConnection::EAttachToDefault, conn);

// Set Properties of the default sub-connection

subconn.SetParameters(…);

// Open a TCP socket on the connection (this is the same as using the default sub-connection)

sock.Open(ss, KAfInet, KSockStream, KProtocolInetTcp, conn);

_LIT(KRasAddr,"10.159.24.13");

const TInt KEchoPort = 7;

TInetAddr destAddr;

destAddr.Input(KRasAddr);

destAddr.SetPort(KEchoPort);

// Request the Socket to connect to the destination over the default sub-connection

sock.Connect(destAddr, status);