author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Thu, 21 Jan 2010 18:18:20 +0000 | |
changeset 0 | 89d6a7a84779 |
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<?xml version="1.0" encoding="utf-8"?> |
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
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<!-- This component and the accompanying materials are made available under the terms of the License |
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"Eclipse Public License v1.0" which accompanies this distribution, |
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
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<!-- Initial Contributors: |
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Nokia Corporation - initial contribution. |
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Contributors: |
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--> |
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<!DOCTYPE concept |
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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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"> |
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// Assume have a TInquirySockAddr object, addr, with relevant device info |
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// Connect an L2CAP socket |
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RSocket socket; |
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// although CBluetoothSocket may be a better option. |
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RSocketServ socketServ; |
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TRequestStatus status; |
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User::LeaveIfError(socket.Open(socketServ,KBTAddrFamily,KSockSeqPacket,KL2CAP)); |
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User::LeaveIfError(socket.Connect(addr,status)); |
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User::WaitForRequest(status); |
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if (status == KErrNone) |
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{ |
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// Write some simple data |
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_LIT8(KDataToWrite,"01234"); |
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socket.Write(KDataToWrite,status); |
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User::WaitForRequest(status); |
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} |
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// Close socket |
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socket.Close(); |
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</codeblock> <p><b>Notes </b> </p> <ul><li id="GUID-29346F87-A859-52D6-851D-45956A92C78A"><p>For both the RFCOMM and L2CAP protocols, no data can be sent or received in the <xref href="GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0.dita"><apiname>Connect()</apiname></xref> and <xref href="GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0.dita"><apiname>Shutdown()</apiname></xref> calls. The versions of these calls that take extra data panic. </p> </li> <li id="GUID-5548E996-442E-5DF6-A82B-3027FEE78FD0"><p>RFCOMM uses sockets of the stream socket (<xref href="GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0.dita"><apiname>KSockStream</apiname></xref>) type. </p> </li> <li id="GUID-B0B91FCD-E794-5BDD-B0E7-4E09AEFA5A10"><p>L2CAP uses sockets of the sequenced packet (<xref href="GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0.dita"><apiname>KSockSeqPacket</apiname></xref>) type. </p> </li> </ul> </section> <section><title>Where Next?</title> <p>This tutorial set takes you through all the steps involved in setting up and communicating over a Bluetooth connection. </p> <ul><li id="GUID-C29A5CAD-04E7-5A51-98D2-4E7131633D1E"><p> <xref href="GUID-301488F8-B6D8-569A-B05E-19B740FE4C00.dita">Selecting a Remote Device</xref> </p> </li> <li id="GUID-EE602D07-9849-5E45-B5D9-FEB8020C2F04"><p> <xref href="GUID-CED041C8-D68D-55D1-957E-1A48EEFFF851.dita">Inquiring About Remote Devices</xref> </p> </li> <li id="GUID-8D4E47A9-B098-5B76-8BAC-BB3F7932CC5E"><p> <xref href="GUID-A13494B9-C1E4-506A-B236-8AE0A6D6D557.dita">Inquiring About Services on a Remote Device</xref> </p> </li> <li id="GUID-ED85B28C-845F-5394-A186-6D60901D50BB"><p> <b>Connecting and Transferring Data to a Remote Device</b> - This document </p> </li> <li id="GUID-8246800D-5362-5179-9CB2-4C5168D17934"><p> <xref href="GUID-4F0C4B9D-AA42-59C4-900A-7045FEAAF2F4.dita">Using security on outgoing sockets</xref> </p> </li> </ul> </section> </conbody></concept> |