Bluetooth Development with 'NET

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Bluetooth Development with .NET

• Peter Foot

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Bluetooth

• A layered protocol
• low power radio on license free 2.4GHz band
• Short 32ft (10m) range
• Enables peer to peer connectivity
• Standard range of profiles for common tasks
• Extensible by third-parties

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32feet.NET

• Collection of libraries for .NET
• For Desktop, Embedded and Mobile devices
• Currently Bluetooth and IrDA transports and
  Object Exchange protocol support
• Designed to complement existing network support
  in .NET
• Online forums and documentation

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Supported Platforms

• Windows XP SP1 (And later)
• Running Microsoft Bluetooth Stack
• Windows CE 4.1 (And later)
• Including Windows Mobile 2003 and up
• Running Microsoft Bluetooth Stack
• Broadcom (Widcomm) stack not currently supported
  - http//www.high-point.com

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Bluetooth Tasks

• Manage device radio state
• Find available devices
• Make connections
• Host a service
• Send objects

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BluetoothRadio

• Windows CE supports single radio
• BluetoothRadio.PrimaryRadio
• Windows XP supports multiple radios
• BluetoothRadio.AllRadios
• .Mode Off, On Discoverable
• .IsSupported Detect whether Microsoft Bluetooth
  stack is installed

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Discover

• BluetoothClient class
• .DiscoverDevices()
• Default will return all devices
• Optionally return only previously bonded devices,
  or only unknown devices
• Returns collection of BluetoothDeviceInfo objects

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Choose a Device

• SelectBluetoothDeviceDialog

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Demo

• Discovering Devices

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Connecting

• Use the BluetoothClient class
• Specify the unique service id
• BluetoothService class contains standard service
  ids
• Read and write data via a NetworkStream object
• Close stream when finished

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Demo

• Connect to GPS

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Host a Service

• Use the BluetoothListener class
• Create a unique service id (Guid)
• Start() to publish your service
• AcceptSocket() or AcceptBluetoothClient()
• Block until incoming connection is made
• Send and receive data
• Stop() to unregister the service

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Send Objects

• ObexWebRequest
• Works just like an HttpWebRequest
• Send any file or object
• Some devices may only accept common object types
  vCard, vCalendar etc
• Common Mime types are in
• InTheHand.Net.Mime namespace

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Demo

• Send a vCard

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Receive Objects

• ObexListener
• Works like HttpListener (.NET 2.0)
• Receive incoming objects
• Sample included in the download

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Call to Action

• Easy to add Personal Area Networking to your .Net
  applications
• Download the latest version-
• http//www.32feet.net
• Start developing exciting applications
• Let me know how you get on-
• peter.foot_at_gmail.com

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Demo

• Receiving beamed images

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Any Questions?