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<concept xml:lang="en" id="GUID-E3E19113-AAEE-55C2-8016-11D492123762"><title>Creating a new sub-connection - Adding an already connected socket</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>The following example shows how an application can use a sub-connection explicitly via an <xref href="GUID-0AFDA357-EE44-3788-9CAB-162B874134BF.dita"><apiname>RSubConnection</apiname></xref> instance, and tie an already connected <xref href="GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0.dita"><apiname>RSocket</apiname></xref> to the sub-connection that has had its properties set (parameter creation is described in separate section): </p> <codeblock id="GUID-3FCEF3CA-23AB-5040-90F9-C96A49FA4A84" 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);

// Open a TCP socket on the 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);

// Connect the Socket to the destination over the connection (default sub-connection)
sock.Connect(destAddr, status);

// Create a new sub-connection
subconn.Open(ss, RSubConnection::ECreateNew, conn);

// Set Properties of the sub-connection
subconn.SetParameters(…);

// Move the connected socket onto the new sub-connection
TRequestStatus status;
subconn.Add(sock, status);

// Wait for socket to added
User::WaitForRequest(status);
</codeblock> <p> <b>Note:</b> Error handling is not included to aid clarity. </p> </conbody></concept>