Bluetooth Access Point

1
Bluetooth Access Point

• A Comnet lab project by
• Omry Yeshurun
• Dotan Perry
• Supervisor Alex Sprintson

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Overview

• Bluetooth
• BT is a short range radio-technology using a
  frequency hopping scheme in the ISM band.
• Originally developed as a cable replacement
  technology, enabling people and machines to
  interact at short range. And hence can be used as
  a mean to establish internet connection via
  access-point

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Specification

• Bluetooth access point is a unit which has an IP
  connection, and can distribute internet
  connection over Bluetooth to adjacent units
  PDAs, Laptops etc.

FOR MORE INFO...
http//www.bluetooth.com http//comnet.technion.ac
.il/cn9s02/
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Goals

• Demonstrate Bluetooth connection
• Achieve connection on IP level
• Serve multiple clients simultaneously
• Learn Bluetooth interface
• Get acquainted with Linux

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Packages used in Project

• New Linux kernel 2.4.18
• BlueZ kernel 2.2
• BlueZ library 2.2 Utilities 2.1
• BlueZ PAN 0.8
• BlueZ SDP 1.0
• BlueZ DUN 0.5

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Development issues

• Using Windows vs. Linux Linux was chosen for
  open-source repeated problems with previous
  projects using Win2K
• Driver for the Bluetooth units BlueZ was chosen
  its the official Linux stack
• Giving an IP address to each connection, using
  DHCP too complicated and inefficient

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Connection Interface Options

• PAN Personal Area Network
• Enables IP connection via NIC-style interface
  (bnep0 instead of eth0)
• Enables easy interface to create the NAP (Network
  access point)
• Allow other uses such as GN (Ad-Hoc Grouped
  Networks)
• RFCOMM PPP
• Enables IP connection via modem-style interface
  (ppp0 connection)

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THE FINAL DESICION

• We chose to use PAN interface, (after consulting
  various on-line forums) because of its easier
  installation, usage, greater stability and its
  support of NAP

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Design specification

• Each unit is independent
• Every connection is served by a different
  process
• Every request has its own thread
• Connection is done by Socket interface to units
  to internet
• Upon unit detection, a process will be
  initialized
• Process will die when session ends (timeout)

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Model Structure
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Project modules
Client
Server
Part 1
BT Unit
BT Unit
Part 2
Part 3
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Project modules cont.

• Part 1- Build TCP connection over Bluetooth, that
  will enable every kind of IP application (i.e.
  ping, ftp, internet)
• Part 2 Configure client to use Bluetooth device
  as underlying transport device (instead of its
  eth0 interface)
• Part 3 Configure server to serve as
  Access-Point, i.e. bridging of packets.

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Future steps

• Implement SDP Service Discovery Protocol
  automatic connection to available access-points
• Create an automatic configuration script that
  will start the client and the server
• Create traffic monitor to enable using better
  connections

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Problems encountered

• Unreliable communication between Bluetooth units
• Problems with inquiry and discovery of adjacent
  units in range
• Packet loss, even in short ranges
• BlueZ stack is always under development,
  therefore documentation becomes obsolete
• BlueZ specification is not closed many changes
  occurred during development.
• No central source for information regarding
  drivers and configurations

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Schedule
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