An Investigation of Bluetooth An Investigation of Bluetooth Application Program Interface Application Program Interface

Layer DevelopmentLayer Development

Sam KnightsSam Knights

Rhodes UniversityRhodes UniversitySupervisors: Dr G. Foster and Prof P. ClaytonSupervisors: Dr G. Foster and Prof P. Clayton

This will contribute towardsThis will contribute towardsan Automated Wireless an Automated Wireless

Identification System (AWIS) for Identification System (AWIS) for tracking animals in the wild.tracking animals in the wild.

Presentation OutlinePresentation Outline

Introduction/BackgroundIntroduction/BackgroundGoals and ObjectivesGoals and ObjectivesApproachApproachDeliverablesDeliverablesConclusionConclusion

IntroductionIntroduction

Who or what is Bluetooth?Who or what is Bluetooth? Danish King, blueberries Danish King, blueberries (ca 950) Wireless radio-based network protocolWireless radio-based network protocol

Background - BluetoothBackground - BluetoothWhy BluetoothWhy Bluetooth

Wild animals collect data about their own Wild animals collect data about their own social interaction social interaction

Radio collars, IrDA and 802.11b unsuitableRadio collars, IrDA and 802.11b unsuitableLow power, 10m range.Low power, 10m range.

RFCOMMRFCOMM

Background – Bluetooth 2Background – Bluetooth 2Bluetooth Bluetooth Protocol StackProtocol Stack

Implements Bluetooth Protocol and acts as controlling agentImplements Bluetooth Protocol and acts as controlling agent Allows communication with other devices and control of own Allows communication with other devices and control of own

device.device. Comprises of layers and profiles (defined set of functionality).Comprises of layers and profiles (defined set of functionality).

SDPSDP

HCIHCI

L2CAPL2CAP

Service Discovery Service Discovery ProtocolProtocol

Logical Link Control Logical Link Control Adaptation LayerAdaptation Layer

Host Controller InterfaceHost Controller Interface

ApplicationsApplications

HardwareHardware

Wireless Serial PortWireless Serial Port

BT STACK

Application Programming InterfaceApplication Programming Interface Mechanism used to access Protocol StackMechanism used to access Protocol Stack Exposes core functionalityExposes core functionality

RFCOMM APIRFCOMM API

L2CAPL2CAP

SDPSDP RFCOMMRFCOMM

HCIHCI

SDP APISDP API

OBEXOBEX

3rd Party SoftwareStack Extensions

Serial Port ProfileSerial Port Profile Service Discovery Service Discovery Application ProfileApplication Profile

OBEX APIOBEX API

BT

Sta

ckB

T S

tack

Objectives – My project fits in hereObjectives – My project fits in here

Goal : Investigate APIs allowingGoal : Investigate APIs allowingDevice connectivityDevice connectivityData transferData transferFeature-rich, robust for networking app Feature-rich, robust for networking app

developmentdevelopment

Approach - SoftwareApproach - Software

Windows CEWindows CEWindows Sockets (WinSock)Windows Sockets (WinSock)Virtual COM PortsVirtual COM Ports3rd Party Vendors e.g. AveLink3rd Party Vendors e.g. AveLink

Embedded Visual C++ 4.0Embedded Visual C++ 4.0 .NET Compact Framework.NET Compact Framework

SmallSmallfootprintfootprintclientsclients

Application Application DevelopmentDevelopment

Application Programming InterfaceApplication Programming InterfaceWindows CE implementation of the Windows CE implementation of the

Bluetooth Protocol StackBluetooth Protocol Stack

COM COM Port Port EmulationEmulation

L2CAPL2CAP

SDPSDP RFCOMMRFCOMM

HCIHCI

AFDAFD

WinsockWinsock

OBEXOBEXApplications

3rd Party SoftwareStack Extensions

Approach - ExperimentationApproach - Experimentation

To start: To start: two Bluetooth devicestwo Bluetooth devices

Two dongles initiallyTwo dongles initially A number of PDAs for mobile testingA number of PDAs for mobile testing

one Bluetooth hostone Bluetooth host Bluetooth Stack and Bluetooth APIBluetooth Stack and Bluetooth API

Basic Application must have:Basic Application must have: Stack initialisation, Device Management, Device Stack initialisation, Device Management, Device

and Service Discovery, Communication.and Service Discovery, Communication. Field test in the CS DepartmentField test in the CS Department

Device discoveryDevice discovery Data transferData transfer

DeliverablesDeliverables

Application - Device ConnectivityApplication - Device ConnectivityDevice discovery, data transfer, features.Device discovery, data transfer, features.

Feasibility StudyFeasibility StudyRapid prototyping Rapid prototyping Application developer’s point of viewApplication developer’s point of viewClaims of simplicity, constraints thereinClaims of simplicity, constraints therein

Summary and ConclusionSummary and Conclusion

Outline and introduction of BluetoothOutline and introduction of BluetoothAccess of Bluetooth Protocol Stack via Access of Bluetooth Protocol Stack via

Application Programming Interfaces (APIs)Application Programming Interfaces (APIs)Objectives and approachObjectives and approachDeliverablesDeliverables

Questions?Questions?

Wireless ProjectsWireless Projects

A. King : Peer-to-peer networking , Data transfer

B.Clayton : Scatternets, Ad-hoc networking

S. Knights : Application Programming Interfaces

BLUETOOTH STACK

B. Fox : Custom operating system

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