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<concept id="GUID-8451102A-8E68-5C86-9E40-D53183E32261" xml:lang="en"><title>Bluetooth

SDP Overview</title><shortdesc>The Bluetooth Service Discovery Protocol (SDP) component enables

you to register services to the SDP database and query the database for available

services. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<section id="GUID-C24E4D4D-7A0A-4BC6-A16F-6D4DDFFF17E7"><title>Purpose</title> <p>The Symbian platform Bluetooth Service

Discovery Protocol (SDP) component provides APIs that allow you to register

services to the SDP database or query the database for available services.

This functionality is provided by the two SDP APIs: </p> <ul>

<li id="GUID-F5D35BDC-9FEC-5C29-9DB0-BAF1BF8F44B8"><p><xref href="GUID-756D831F-F302-594C-8116-144358DD8442.dita">SDP

Database</xref>  </p> </li>

<li id="GUID-A153C7B6-0B8C-5DA6-B765-8B60C1D39227"><p><xref href="GUID-8D5E17DA-8EF1-52B4-9706-9836B8D6CE43.dita">SDP

Agent</xref>  </p> </li>

</ul> <p> </p> </section>

<section id="GUID-EE776EBD-D97F-4037-8E1D-ADB1F7CC17DA"><title>Required background</title> <p>You need to be familiar with

the following: </p> <ul>

<li id="GUID-26920C05-C124-5276-A73B-952078316D88"><p><xref href="GUID-5FE7D4DB-B853-57C4-8A90-16DF92F6231A.dita">Symbian

platform Bluetooth User</xref>  </p> </li>

<li id="GUID-89FB4CCE-8A1A-5ACA-AE34-57EA9DDFE6B5"><p><xref href="GUID-7640F878-2D99-52C8-ACBE-8B77A714E081.dita">Symbian

platform Bluetooth Protocols</xref>  </p> </li>

<li id="GUID-1623B937-2D45-5092-8A66-416FF2E930C2"><p>The Bluetooth Service

Discovery Protocol specification, Volume 3 Part C of the Specification of

the Bluetooth System, available at <xref href="http://www.bluetooth.com/" scope="external">www.bluetooth.com/</xref>  </p> </li>

<li id="GUID-DDA0875F-0256-5454-907A-D52B33AAA613"><p>UUID Values for SDP

services. </p> </li>

</ul> <p> </p> </section>

<section id="GUID-520ED67C-25D2-472E-9686-EB86B74E7ADB"><title>Key concepts and terms</title> <p>The following terms are

used frequently throughout the SDP Overviews and Tutorials. </p> <dl>

<dlentry>

<dt>Service Discovery Database</dt>

<dd><p>This is the database that stores information about available services.

If you are writing an application to advertise a specific service you will

use the SDP Database APIs to register your service and if you are writing

an application that needs to search for available services on other devices

you will use the SDP Agent APIs. </p> </dd>

</dlentry>

<dlentry>

<dt>Service Record</dt>

<dd><p>A data record for an individual service in the service discovery database. </p> </dd>

</dlentry>

<dlentry>

<dt>Service Record Attribute</dt>

<dd><p>An attribute of the service that is stored in the service record. We

will discuss service record attributes in greater detail in "<xref href="GUID-ED342E6B-A4A3-576B-8934-7E7C049837F0.dita">SDP

Service records and attributes</xref> ". </p> </dd>

</dlentry>

<dlentry>

<dt>UUID</dt>

<dd><p>Universally Unique Identifier - See the Service Discovery Protocol

Assigned Numbers listing from the Bluetooth SIG for a current list of default

UUIDs. </p> </dd>

</dlentry>

<dlentry>

<dt>DEA</dt>

<dd><p>Data element alternative - A sequence of data elements of which one

must be selected. </p> </dd>

</dlentry>

<dlentry>

<dt>DES</dt>

<dd><p>Data element sequence - A sequence of data elements. </p> </dd>

</dlentry>

</dl> </section>

<section id="GUID-6F36EC26-5A7B-411D-8F27-3A4A00FAE184"><title>Architecture</title> <p>A service wishing to advertise on

the SDP server must create a session with the SDP server using <xref href="GUID-0879B4D7-A6FA-382F-A124-0234BA89D33D.dita"><apiname>RSdp</apiname></xref>.

A subsession must be created through <xref href="GUID-FC133F0F-C9E8-30CB-B2FE-8AC9F7F802AC.dita"><apiname>RSdpDatabase</apiname></xref> to access

the database. A subsession allows service records and their attributes to

be added, deleted and updated in the database. The application uses <xref href="GUID-6A33D6A1-63C8-3A15-A2BC-5D08F07C5AB6.dita"><apiname>CSdpAgent</apiname></xref> to

query the services and has to implement <xref href="GUID-AD76DB7F-CD45-3903-A07A-E94BE583CDB0.dita"><apiname>MSdpAgentNotifier</apiname></xref> or <xref href="GUID-3DC9CB25-E55D-38E6-8940-B3320EF7E9DD.dita"><apiname>MSdpElementBuilder</apiname></xref> interfaces

to handle and organize responses from the server. </p> <p><b>SDP Database </b> </p> <p>The SDP database maintains a list of service

records that describe the characteristics of services on the local device

that may be used by a remote device via Bluetooth. Each service record contains

information about a single service. </p> <p><b>SDP Agent </b> </p> <p>The SDP agent retrieves information from a service

record in the SDP database by issuing an SDP request. If an application chooses

to use a service, it opens a separate connection with the service provider.

For example; </p> <p>if you need to print a document on your Symbian platform

phone you could: </p> <ol id="GUID-CC0974A0-26EA-599B-A624-1CCAA8CF218E">

<li id="GUID-7C120CC4-EAC2-5F9F-A086-336F42554403"><p>do an SDP search for

devices offering a print service. </p> </li>

<li id="GUID-FCD7AD1B-CA98-53E2-99F2-77C6E9FC9A36"><p>Should a device be found

offering the print service you would further query it for connection details. </p> </li>

<li id="GUID-0ADFC4F6-810B-566F-A611-6A21784B9CCC"><p>With that information

your application would then create a Bluetooth connection to the device in

question using the connection configuration required and print the document. </p> </li>

</ol> </section>

<section id="GUID-E968CA22-FBD7-48F1-B538-D19CF84F1F80"><title>SDP library details</title> <p>The Bluetooth SDP component

has two published libraries. The DLLs that provides the functionality and

the libraries to which your code must link are identified below. </p> <table id="GUID-22CB200C-4F18-59DC-8F6F-2F8BE70B4CF9">

<tgroup cols="3"><colspec colname="col0"/><colspec colname="col1"/><colspec colname="col2"/>

<thead>

<row>

<entry>DLL</entry>

<entry>LIB</entry>

<entry>Short description</entry>

</row>

</thead>

<tbody>

<row>

<entry><p> <filepath>sdpdatabase.dll</filepath>  </p> </entry>

<entry><p> <filepath>sdpdatabase.lib</filepath>  </p> </entry>

<entry><p>Allows a local service to register itself to a local Bluetooth service

database. </p> </entry>

</row>

<row>

<entry><p> <filepath>sdpagent.dll</filepath>  </p> </entry>

<entry><p> <filepath>sdpagent.lib</filepath>  </p> </entry>

<entry><p>Enables a Bluetooth device to discover the Bluetooth services, and

the attributes of those services, that are available on a remote Bluetooth

device. </p> </entry>

</row>

</tbody>

</tgroup>

</table> </section>

<section id="GUID-9033AE9C-0C92-4B5C-BBDD-51ACF8707B1D"><title>Typical uses</title> <p>The following are typical uses for

the SDP Database and SDP Agent APIs: </p> <p><b>SDP

Database</b> </p> <p>The SDP Database API provides access to the database

for creating and maintaining records of services and setting the service attributes. </p> <p>For

more information see: </p> <ul>

<li id="GUID-EA5A4019-2F62-534A-8795-FD7873462DD5"><p><xref href="GUID-756D831F-F302-594C-8116-144358DD8442.dita">SDP

Database Overview</xref>  </p> </li>

<li id="GUID-D336C6C6-55A6-5007-BD7C-A18408EAE150"><p><xref href="GUID-ED342E6B-A4A3-576B-8934-7E7C049837F0.dita">SDP

Service records and attributes</xref>  </p> </li>

</ul> <p>The typical uses for the SDP Database are: </p> <ul>

<li id="GUID-F88F0267-8BFA-52F1-88CB-A436CB0CBC33"><p><xref href="GUID-B75BD3DE-9C2E-5429-B55B-891462B92795.dita">Connecting

to the service discovery database</xref>  </p> </li>

<li id="GUID-BF5ABE0A-0329-5C72-8445-C169102485D6"><p><xref href="GUID-E2A2FA2A-5D9A-56FE-B7E5-69CCBC656BB9.dita">Handling

SDP attributes</xref>  </p> </li>

<li id="GUID-1EFA60F1-B700-52A5-BB25-A118167D93CE"><p><xref href="GUID-2373A158-C18A-51B5-BE9A-6B8F7FC63A35.dita">Registering

Services</xref>  </p> </li>

<li id="GUID-AA370FC4-E2EE-5C0C-B199-DB187AEC9582"><p><xref href="GUID-33210C48-3198-51BC-9970-8B29F711A8E2.dita">Setting

service record attributes</xref>  </p> </li>

</ul> </section>

</conbody></concept>