CEN4500 Experiment 2: Bluetooth Device Discovery and Analysis

1
CEN4500 Experiment 2 Bluetooth Device Discovery
and Analysis

• Dr. Ahmed Helmy
• Introduced by Sungwook Moon
• Jeeyoung Kim
• Wei-jen Hsu

2
Outline

• Introduction of the lab 2
• Bluetooth device discovery
• Brain-storming questions

3
Logistics

• Lab2
• Part I encounter discovery (2/25 3/7)
• Part II submit a report by noon on 3/27 to the
  lab
• This presentation slides and the lab manual will
  be available on the course website.
• We will distribute PDAs you use for the lab
  today. The encounter discovery starts right away.

4
Delay Tolerant Networks (DTN)

• Performance-challenged networks where continuous
  end-to-end connectivity cannot be assumed.

5
Objectives of this lab

• To understand (through hands-on experience) what
  are the patterns of the existing communication
  opportunities via short-range radio (Bluetooth).
• To brain-storm about how we could utilize this
  encounter information in DTNs.

6
Encounter

• If a device is within a radio-range, we call it
  an encounter.
• In our experiment, Bluetooth discovery means an
  encounter.

7
Part I Bluetooth Discovery

• Each person will be given an iPAQ PDA with a
  program called BlueChat. BlueChat logs other
  Bluetooth devices in radio range.
• Carry this iPAQ PDA with BlueChat program running
  all the time.
• It is OK to play with this PDA but please be
  careful not to remove any of files.
• Return the device on Mar 7 to the lab (CSE 401).

8
Part I Bluetooth Discovery (BlueChat)
9
Part I Bluetooth Discovery

• BlueChat characteristics
• displays the ID and MAC address of discovered
  Bluetooth devices.
• scans every 20 seconds, however, it may not
  display some of devices that pass by quickly.
• refreshes every 3 min., clears the devices
  displayed and may not display any devices for
  20-30 sec.
• If a battery runs out, a timer might be set to
  2005 (Windows mobile 5.0 drawback), so be careful
  not to drain the battery.

10
Part I Bluetooth Discovery

• Check to make sure Bluetooth is enabled. You can
  turn this on/off in the setting -gt connection.
• If a battery runs out, a timer might be set to
  2005 (Windows mobile 5.0 bug), so be careful not
  to drain the battery.

11
Part II Brain-storming

• Collected trace will be uploaded to the course
  website. Download and analyze it according to the
  questions given on the lab manual.
• Each group should submit a report by noon on Mar
  27 to the lab.
• Details about the report will be up on the
  website in the following week.

12
QA

• You are always welcomed to come to the lab for
  questions.