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<concept id="GUID-F2A793F1-A5B5-526B-B147-771D440B13A2" xml:lang="en"><title>Bluetooth

Extended Inquiry Response</title><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>This is a guide to the Symbian platform Bluetooth implementation of Extended

Inquiry Response (EIR). </p>

<section id="GUID-F3729B8D-A900-41E2-868E-E04EFD21E76E"><title>Purpose</title> <p>EIR provides information about discoverable

devices during a Bluetooth Inquiry. </p> <p><b>Intended

audience:</b> </p> <p>This document is intended to be used by Symbian platform

licensees and third party application developers. </p> </section>

<section id="GUID-3F8DF3A7-47F8-47C2-9F47-570D22E4C999"><title>Introduction</title> <p>A Bluetooth communication connection

is created by two or more devices within a piconet. A device that wishes to

create a connection must find which other devices/services are available.

The Inquiry is a request sent by a Bluetooth-enabled device (the "Inquiring

Device") over a separate physical channel, not within an existing piconet.

The Inquiry requests all listening ("discoverable") Bluetooth devices to identify

themselves. In the standard Inquiry Response each device responds with their

own MAC identifier. The Inquiring Device then has to issue a request to each

device to determine the local name and any services that each device can support.

Supported services may include stereo headset or FTP. </p> <p>The Extended

Inquiry Response (EIR) replaces the standard Inquiry Response and contains

additional information. </p> <p>Legacy devices are supported so the set of

responses from all devices may include both EIR and standard Inquiry Responses. </p> </section>

<section id="GUID-04C48C8B-491E-456C-A2E4-C2AB99A491B9"><title>EIR response values</title> <p>The Extended Inquiry Response

includes the following: </p> <ul>

<li id="GUID-01F8A0CA-CA3B-5032-B934-0AA84E41FAF3"><p>device local name </p> </li>

<li id="GUID-1D61827C-8B5B-55FD-BCDD-B416292FDED6"><p>service class UUIDs

of each service the device supports </p> </li>

<li id="GUID-71BE4DDD-4406-5633-AAAA-8A23061242F5"><p>the transmission power </p> </li>

<li id="GUID-E5CA163A-26F3-5031-8F2B-C0FB543C51FB"><p>manufacturer specific

values </p> </li>

</ul> <p><b>Device

local name</b> </p> <p>On a device such as a phone handset the device local

name may be set by the user. For example, "Tom's Nokia E71". Otherwise the

local name defined by the manufacturer, for example "MyTech BT Headset". The

EIR data packet is a fixed size so the number of characters available for

the device local name may be insufficient for the entire device local name.

The data sent is as many characters as fit starting with the first character.

The number of characters available depends on how many service IDs are sent

and so this length varies from device to device. A flag is available to indicate

whether the device local name sent is the complete name or a truncated version. </p> <p><b>Service class UUIDs of each service the device supports</b> </p> <p>A

Service Class UUID is a value which identifies a particular type of service/functionality

provided by the device. For example, there would be a Service Class UUID to

identify a printer, and another Service Class UUID to identify a stereo headset. </p> <p><b>Transmission Power</b> </p> <p>A one byte value containing a transmission

power level between -127dBm and +127dBm. The Transmission Power (Tx Power)

value is optional. May be used in conjunction with the Received Signal Strength

Indicator (RSSI) to calculate pathloss and give an estimate of which of two

or more responding devices is physically closer to the Inquiring Device. </p> <p><b>Manufacturer specific values</b> </p> <p>This is a set of 8-bit bytes

and all interpretation and structure is entirely down to the specific manufacturer. </p> </section>

<section id="GUID-8EEE55FA-89F0-4186-A2CF-F9B9C47AF4A6"><title>EIR tutorials</title> <ul>

<li id="GUID-23BDCDE6-F8F1-5FAD-BF2B-F87917DB0558"><p> <xref href="GUID-783D0B50-0E8A-5199-A07E-749D4A71E671.dita">Processing

an Extended Inquiry Response</xref>  </p> </li>

</ul> </section>