BlueZ Project -

OutlineBluetooth Technology

BlueZGSoC Projects

Demos

BlueZ Project

Gustavo F. Padovan and Joao Paulo Rechi Vita

December 9, 2009

Gustavo F. Padovan and Joao Paulo Rechi Vita BlueZ Project


BlueZGSoC Projects

Demos

1 Bluetooth TechnologyOverviewSpecification

2 BlueZOverview of BlueZFeatures and ModulesUnder developmentFuture

3 GSoC ProjectsPulseAudio bluetooth modulesA2DP SinkL2CAP Enhanced Retransmission and Streaming Modes

4 Demos



BlueZGSoC Projects

Demos

OverviewSpecification

Overview of Bluetooth

Open wireless network technology

Designed for short-distance data exchange

Originally conceived as a wireless alternative to RS-232

Bluetooth SIG1

Harald Blatand bla = blue, tand = tooth

1http://www.bluetooth.org/Gustavo F. Padovan and Joao Paulo Rechi Vita BlueZ Project


BlueZGSoC Projects

Demos


Previous Versions

1.0 e 1.0B – Interoperability problems

1.1 – Bug fixes, RSSI2, IEEE standard

1.2 – Faster connection and discovery, higher transfer rate(721kpbs), eSCO3, L2CAP Flow Control e RT modes

2.0 + EDR – Enhanced Data Transfer (nominal 3Mpbs, real2.1Mbps), lower power consumption

2.1 + EDR – Secure Simple Pairing, NFC

2.1 Addendum – L2CAP ERTM and Streaming

2Received Signal Strengh Indicator3extended Syncronous Connections



BlueZGSoC Projects

Demos


Latest – 3.0 + HS

Alternate MAC/PHY

Unicast connectionless data

Read encryption key size

Enhanced power control



BlueZGSoC Projects

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Future

Bluetooth Low Energy

Broadcast channel

Topology management

QoS improvements



BlueZGSoC Projects

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Future :(

In October 2009 the Bluetooth SIG has dropped development ofUWB as part of the alternative MAC/PHY, Bluetooth 3.0/HighSpeed solution. A small, but significant, number of formerWiMedia members had not and would not sign up to the necessaryagreements for the IP transfer. The Bluetooth group is now in theprocess of evaluating other options for its longer term roadmap.



BlueZGSoC Projects

Demos


Protocol Stack



BlueZGSoC Projects

Demos

Overview of BlueZFeatures and ModulesUnder developmentFuture

The BlueZ Project

Official Linux Bluetooth protocol stack

Project started in 2001 by Qualcomm

Not planned for the final user

D-Bus API

Used by gnome-bluetooth, kbluetooth,gnome-phone-manager, oFono, BlueMaemo



BlueZGSoC Projects

Demos


Features

Complete modular implementation

Symmetric multi processing safe

Multithreaded data processing

Support for multiple Bluetooth devices

Real hardware abstraction



BlueZGSoC Projects

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Modules

Bluetooth kernel subsystem core

L2CAP and SCO audio kernel layers

RFCOMM, BNEP, and HIDP kernel implementations

HCI UART, USB, PCMCIA and virtual device drivers

General Bluetooth and SDP libraries and daemons

Configuration and testing utilities

Protocol decoding and analysis tools



BlueZGSoC Projects

Demos


Supported Profiles

HFP - HandsFree Profile

HSP - Headset Profile

A2DP - Advanced Audio Distribution Profile

DUN - Dial-up Network Profile

HID - Human Interface Device Profile

PAN - Personal Area Network Profile

OPP - Object Push Profile

OPP - File Transfer Profile

PBAP - Phone Book Access Profile

SYNC - Synchronization Profile



BlueZGSoC Projects

Demos


Under development

ERTM and Streaming Modes (dependencies for AMP andHDP)

HDP - Health Device Profile

SAP - SIM Access Profile

HFP Handfree role.

MAP - Message Access Profile



BlueZGSoC Projects

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Future

VDP - Video Distribution Profile

AMP - Alternate MAC/PHY(High Speed)

NFC - Near Field Communication

Bluetooth Low Power



BlueZGSoC Projects

Demos

PulseAudio bluetooth modulesA2DP SinkL2CAP Enhanced Retransmission and Streaming Modes

PulseAudio bluetooth modules (2008)

module-bluetooth-discover

module-bluetooth-device



BlueZGSoC Projects

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A2DP Sink (2009)

BlueZ A2DP Sink

PulseAudio A2DP Source



BlueZGSoC Projects

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L2CAP Layer

It is responsible for

Protocol/channel multiplexing

Segmentation and reassembly of packets

Per-channel flow control

Error control



BlueZGSoC Projects

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The GSoC Project

Enhanced Retransmission Mode(ERTM)

Streaming Mode

Segmentation and Reassembly

FCS Option



BlueZGSoC Projects

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The GSoC Project

ERTM is a Requirement for AMP (AMP can’t use BasicMode)

ERTM is a Requirement for HDP

ERTM is a Requirement for OBEX over L2CAP



BlueZGSoC Projects

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Status

Most of the code has been merged into 2.6.32

Some features no implemented yet.

Still disabled. Need stabilization.



BlueZGSoC Projects

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Stream A2DP between 2 BlueZ hosts

1 Enable Source interface on the Sink SEP

2 Pair both devices

3 org.bluez.AudioSource.Connect()

4 Play on Source SEP

5 BlueZ Source -> ALSA Sink



BlueZGSoC Projects

Demos

L2CAP

Enhanced RT Mode: Retransmission of lost packets

Streaming Mode: Ignore lost packets, sequence numbering



BlueZGSoC Projects

Demos

Questions?

Gustavo F. Padovan - [email protected] Paulo Rechi Vita - [email protected]

#gpsl at irc.freenode.net

http://www.bluez.org#bluez at irc.freenode.net

[email protected]


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