CHATADDICT A Bluetooth based chat application for mobile devices

1
INTRODUCTION

• CHAT-ADDICT A Bluetooth based chat
  application for mobile devices
• JAVA ON MOBILE DEVICES
• Presented by
• Venkateshwar Rao Namilakonda

2
INTRODUCTION

• Introduction and Bluetooth Achitecture
• Communication
• Testing and future enhancement

3
Bluetooth Achitecture

• Overview Of Bluetooth Technology
• Bluetooth-wireless connectivity options for
  mobile devices characterized by short range and
  low-power consumption, ad hoc networking.
• Bluetooth-enabled devices are organized in groups
  called piconets .
• A piconet consists of a master and up to seven
  active slaves.
• A master and a single slave use point-to-point
  communication if there are multiple slaves,
  point-to-multipoint communication is used.

4
Bluetooth Achitecture

• Overview Of BluetoothTechnology
• The Bluetooth Protocol Stack-high-level view of
  the architecture

5
Bluetooth Achitecture

• Overview Of Bluetooth Technology
• The Bluetooth Protocol Stack-high-level view of
  the architecture
• The radio layer physical wireless connection.
• The baseband layer responsible for controlling
  and sending data packets over the radio link.
• The Link Manager Protocol (LMP) uses the links
  set up by the baseband to establish connections
  and manage piconets.
• The Host Controller Interface (HCI) the dividing
  line between software and hardware.
• The Logical Link Control and Adaptation Protocol
  (L2CAP) receives application data and adapts it
  to the Bluetooth format.

6
Bluetooth Achitecture

• Overview Of Bluetooth Technology
• Network Establishment Scheme
• A device not connected to the piconet is in
  standby mode.
• Inquire the device automatically initiates an
  inquiry to find an access point. All nearby
  access points respond with their addresses, and
  the device picks one.
• Page synchronizes the device with the access
  point.
• Establish a link The Link Manager Protocol
  establishes a link with the access point.
• Discover services The LMP uses the Service
  Discovery Protocol (SDP) to find out what
  services are available from the access point.
  Here we assume that the email service is
  available.
• Create an L2CAP Channel The LMP uses information
  obtained from the Service Discovery Protocol
  (SDP) to create an L2CAP channel to the access
  point.

7
Bluetooth Achitecture

• Overview Of Bluetooth Technology
• Network Establishment Scheme
• Create an RFCOMM channel Depending on the needs
  of the application, an RFCOMM channel is created
  over the L2CAP channel.
• Authenticate requires input from the user. If
  the access point requires authentication, it will
  send an authentication request, and the user will
  be prompted to enter a PIN to access the service.
  
• Log in If the device use the Point-to-Point
  Protocol (PPP) over RFCOMM, a serial port is
  emulated.
• Send and receive data The email client and the
  access point now use standard network protocols
  like TCP/IP to send and receive data.

8
Bluetooth Achitecture

• Overview of Our Application
• Midlet-based chat application using server and
  client
• BluetoothServer start the device discovery
  process
• it searches and discover any existing bluetooth
  enabled device in the same piconet within the
  Bluetooth effective range.
• service discovery process then starts to obtain a
  reference (URL) to suitable services.

9
Bluetooth Achitecture

• Key Steps Forming the Bluetooth Application
  Design
• Device discovery
• DiscoveryAgent class and DiscoveryListener
  interface provide the necessary discovery
  services.
• DiscoveryAgent startInquiry method.
• Places the device in question into an inquiry
  mode.
• The application specifies an event listener that
  will respond to inquiry-related events.
• DiscoveryListener.deviceDiscovered is called each
  time an inquiry finds a device.

10
Bluetooth Achitecture

• Service Discovery
• After discovery of at least one remote device,
  device can begin to search for available
  services.
• Communication
• Server constructs an URL placedin the service
  record.
• Initiates a service discovery, retrieves
• the service record, construct a connection
  URL using the service record,
• Opens a connection to the server as well as send
  and receive data to and from the server.

11
Chat Application

• Assumptions
• Design and working
• Functionality and features

12
Assumptions

• No interference with other wireless signals
• There is only one server at any time
• Server will be active before the client tries to
  establish the connection

13
Application Design and analysis
Description of Main Classes
midlet
send
send
midlet
14
Design and Working

• Establishing Communication
• Device discovery
• DiscoveryAgent.startInquiry
• DiscoveryListener.deviceDiscovered
• DiscoveryListener.inquiryCompleted
• DiscoveryAgent.retriveDevices
• Service discovery
• Service registration
• Communication
• Midletclass
• startApp()
• pauseApp()
• destroyApp()

15
Design and Working

• High level user interface
• List
• Form
• TextField
• Alert

16
Functionaility and features

• Functionality
• Startchat() this is the first action performed
  after the BTclient establish the connection with
  BTserver
• Exit this is a default button provided by the
  series 60 nokia SDK which close our application
• Send this button sends the message from client
  to server or vice versa

17
Functionality and Features

• Features
• Storage capacity for storing chatnames as well as
  messages
• Two-way communication between client-server
• Identification of user at both ends
• User friendly interface
• Exception handling for illegal operations

18
Software Test and Perspective

• Functionality of software testing
• Errors
• Techniques involved

19
Functionality of software testing

• Errors
• Syntax error
• Type error
• Semantic error
• Techniques
• Functional testing
• Structural testing

20
Functionality of software testing

• Storage Test

21
Test Results

• Test Successfully performed on storage() class

22
Conclusion

• Knowledge acquired
• Bluetooth technology
• Implementing Bluetooth technology on mobile
  devices
• Testing
• Future enhancements
• N-client chat
• Dictionary enabled chat interface
• Detail study of various profiles offered in
  Bluetooth technology and their relevance with the
  project
• As an opensource project development