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<concept xml:lang="en" id="GUID-A24D2CEF-88C9-5C63-A14D-85EFFBEF3C92"><title>Connecting and Transferring Data to a Remote Device</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>Once the device and service have been established, you can connect to the remote service and start using it. </p> <section><title>How to Communicate with a Remote Device</title> <p>Connect to the device through the <codeph>Connect()</codeph> function of the generic Symbian OS socket interface <xref href="GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0.dita"><apiname>RSocket</apiname></xref>. Bluetooth sockets can be opened using the L2CAP and RFCOMM protocols. For an L2CAP Bluetooth socket, the "port" is the Protocol/Service Multiplexer (PSM) to which to connect; for an RFCOMM the port is the server channel. Where these values are not known, they can be read from the service attribute <codeph>ProtocolDescriptorList</codeph>. See <xref href="GUID-8D5E17DA-8EF1-52B4-9706-9836B8D6CE43.dita">Using Bluetooth Service Discovery Agent</xref> for details. </p> <p>You can read and write data using the socket in whatever format the target service expects (AT commands, text, HTTP, PPP etc). </p> <p><b>Example </b> </p> <codeblock id="GUID-A5B48D01-EBBA-59E1-8016-72655F7683E7" xml:space="preserve">

// Assume have a TInquirySockAddr object, addr, with relevant device info

// Connect an L2CAP socket

RSocket socket;

// although CBluetoothSocket may be a better option.

RSocketServ socketServ;

TRequestStatus status;

User::LeaveIfError(socket.Open(socketServ,KBTAddrFamily,KSockSeqPacket,KL2CAP));

User::LeaveIfError(socket.Connect(addr,status));

User::WaitForRequest(status);

if (status == KErrNone)

    {

    // Write some simple data

    _LIT8(KDataToWrite,"01234");

    socket.Write(KDataToWrite,status);

    User::WaitForRequest(status);

    }

// Close socket

socket.Close();