TITLE SLIDE BSQUARE logo Bill Baxter President, CEO, Director, Founder

1
Using XML to Update Software in Embedded CE
Devices
Ken Rabold Senior Software Engineer BSQUARE
Corporation
2
Introduction

• Embedded devices need new software
• Centralized administration
• Scheduled rollouts
• BSQUAREs CE Remote Updater
• XML based update script
• Architecture and operation
• Samples
• Future steps

3
WBT Application

• Windows Based Terminals
• Lower TCO by centralizing software updates
• Start simple design for enhancements
• Generalize for other applications
• Low end server - HTTP or FTP server
• High end server - dynamic updates

4
Software Updates

• Programs and installations
• Data Files
• COM DLLs
• Update Registry
• Update Operating System
• Simple Commands (Execute, Reboot)

5
Windows CE

• Simplicity and Size
• Client Initiated vs. Server Initiated
• Pull vs. Push
• On demand, scheduled, event driven
• Embrace Internet Standards
• HTTP, FTP, XML
• Support Embedded Device Differences

6
History

• Active Channel
• web site content changes
• software update channels
• CDF (Channel Definition Format)
• Open Software Description
• multi-platform software installs
• All use XML

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CE Remote Updater

• Set of Windows CE COM components
• BSQXML
• SoftwareUpdate
• Registry
• PlatformServices
• XML schema (DTD) that defines an update
  directives script
• Sample source code and ASP code

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Architecture
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Operation

• Load XML Directives from URL
• Check package ID in history log
• Execute each directive in script
• Log package ID in history

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Sample Directives File
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Directives DTD (partial)

• lt?xml version"1.0" encoding"UTF-8"?gt
• lt!ELEMENT Package (CopyFileDiskOnChipOsUpdateExe
  cuteUpdateRegistryReboot)gt
• lt!ATTLIST Package
• ID CDATA IMPLIEDgt
• lt!ELEMENT CopyFile (Description?,Source,Destinatio
  n,CommandLine?)gt
• lt!ELEMENT DiskOnChipOsUpdate (Description?,Source)
  gt
• lt!ELEMENT Execute (Description?,FileName,CommandLi
  ne)gt
• lt!ELEMENT UpdateRegistry (Description?,FileName)gt
• lt!ELEMENT Reboot (PCDATA)gt
• lt!ATTLIST CopyFile
• OSImage (YesNo) "No"
• OSImageSize CDATA "0"
• Register (YesNo) "No"
• Execute (YesNo) "No"
• WaitForExit (YesNo) "No"gt
• lt!ATTLIST Execute
• WaitforExit (YesNo) "No"gt

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CE Application Code

• HRESULT hr
• ISoftwareUpdatePtr updater
• CComBSTR url(http//server/update.xml)
• hr updater.CreateInstance( __uuidof(SoftwareUpda
  te) )
• if( FAILED(hr) ) return hr
• hr updater-gtLoadSystemConfiguration( url )
• if( FAILED(hr) ) return hr
• hr updater-gtRunUpdate()
• if( FAILED(hr) ) return hr

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Server Processing

• Direct access to a particular XML file
• ASP redirect to XML file
• Based on URL parameters
• WBT - Device to Group to XML mapping
• Server side XSL transformation
• Update directives template
• Template transformed with server specific
  addresses and returned dynamically

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Server Processing (ASP)

• URL http//server/update.asp?GroupEngineering
• lt_at_ LanguageVBScript gt
• lt
• Redirect device to specific group
• Select Case Request.QueryString(Group)
• Case Sales
• Response.Redirect(http//server/SalesUpdate.
  xml)
• Case Engineering
• Response.Redirect(http//server/EngineeringU
  pdate.xml)
• End Select
• gt

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Requirements for NT Development System

• Windows NT 4.0
• NT Option Pack 4.0 (for Internet Information
  Server)
• Visual Studio 6.0
• Visual C for CE (VCCE) or Visual Basic for CE
  (VBCE)
• HPC SDK or HPC Pro SDK

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Requirements for the CE Device

• Windows CE 2.00
• MIPS, SH3, emulator
• Windows CE 2.11and 2.12
• ARM, MIPS, SH3, SH4, x86
• Footprint 150KB

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Futures

• Enhance directives for NTe and CE
• Server Administration
• Directives Authoring Tool
• Server update push

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Questions?

• Thank you