Overview of Windows Vista Devices and Windows Communication Foundation (WCF)

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Information about Overview of Windows Vista Devices and Windows Communication Foundation...
Technology

Published on November 28, 2008

Author: jthelin

Source: slideshare.net

 

The Windows Communication Foundation Jorgen Thelin Connected Systems Division Microsoft Corporation [email_address]

The Imperative to Connect MOBILE EMPLOYEES CUSTOMERS MOBILE EMPLOYEES CUSTOMERS

What We Heard From People “ What API should I use?” “ How do I build service-oriented systems?” “ How can I send messages securely & reliably?” “ How do I develop interoperable applications?”

Windows Communication Foundation The Unified Programming Model For Rapidly Building Service-Oriented Applications

Windows Communication Foundation INTEROPERABILITY PRODUCTIVITY SERVICE-ORIENTED DEVELOPMENT Broad Support for WS-* specifications Compatible with existing MS distributed application technologies Unifies today’s distributed technologies Attribute-based development Visual Studio 2005 integration Enables development of loosely-coupled services Config-based communication

Broad Support for WS-* specifications

Compatible with existing MS distributed application technologies

Unifies today’s distributed technologies

Attribute-based development

Visual Studio 2005 integration

Enables development of loosely-coupled services

Config-based communication

PRODUCTIVITY

Unified Programming Model Interop with other platforms ASMX Attribute- Based Programming Enterprise Services WS-* Protocol Support WSE Message- Oriented Programming System.Messaging Extensibility Location transparency .NET Remoting Unified Programming Model

WCF extends the .NET Framework Services are built in Visual Studio 2005 using any .NET programming language

WCF extends the .NET Framework

Services are built in Visual Studio 2005 using any .NET programming language

WCF Composable Architecture Service Code Service Model Layer Influences and adds to the programming model based on incoming messages Messaging Layer Moves messages back and forth and adds transfer semantics (channels) Transaction Behavior CLR Type Integration Instancing Behavior Security Channel TCP Transport Security Channel TCP Transport Transaction Behavior CLR Type Integration

WCF Composability in Action Service Model Layer Messaging Layer Behaviors Channels Transaction Behavior CLR Type Integration Instancing Behavior Security Channel HTTP Transport Custom Channel Reliable Messaging Queue Transport MSMQ Integration TCP Transport Named Pipes Throttling Behavior Error Handling Behavior Concurrency Behavior Metadata Behavior Custom Behavior HTTP Transport TCP Transport Security Channel Custom Channel Reliable Messaging CLR Type Integration Instancing Behavior Transaction Behavior

WCF Runtime Architecture Binding Address Contract

Productivity - DIY Using Visual Studio .NET 2003 20,379 lines security 5,988 lines reliable messaging 25,507 lines transactions Total lines 56,296 4,442 lines infrastructure class HelloService { [WebMethod] public String Hello(String Greeting) { X509CertificateCollection collection = new X509CertificateCollection(); IntPtr blob = Marshal.AllocHGlobal(Marshal.SizeOf( typeof(CRYPTOAPI_BLOB))); IntPtr data = (IntPtr)((int)blob + Marshal.SizeOf(typeof(CRYPTOAPI_BLOB))); … SeqAckRange range = new SeqAcknRange(id, low, high ); SeqAckRange[] ranges = { range }; ReliableQueue.ProcessAcks( ranges ); … hr = pITxDispenser->BeginTransaction (NULL, ISOLATIONLEVEL_SERIALIZABLE, 0, pITxOptions, &pITransaction); … return Greeting; } }

class HelloService {

[WebMethod]

public String Hello(String Greeting) {

X509CertificateCollection collection = new X509CertificateCollection();

IntPtr blob = Marshal.AllocHGlobal(Marshal.SizeOf( typeof(CRYPTOAPI_BLOB)));

IntPtr data = (IntPtr)((int)blob +

Marshal.SizeOf(typeof(CRYPTOAPI_BLOB)));



SeqAckRange range = new SeqAcknRange(id, low, high );

SeqAckRange[] ranges = { range };

ReliableQueue.ProcessAcks( ranges );



hr = pITxDispenser->BeginTransaction (NULL,

ISOLATIONLEVEL_SERIALIZABLE, 0, pITxOptions,

&pITransaction);



return Greeting;

}

}

Productivity - WSE Using Visual Studio .NET 2003 and WSE 10 lines security 1,804 lines reliable messaging 25,507 lines transactions Total lines 27,321 class HelloService { [WebMethod] public String Hello(String Greeting) { foreach ( SecurityToken tok in requestContext.Security.Tokens { X509SecurityToken token = tok as X509SecToken } … SeqAckRange range = new SeqAcknRange(id,low,high ); SeqAckRange[] ranges = { range }; ReliableQueue.ProcessAcks( ranges ); … hr = pITxDispenser->BeginTransaction (NULL, ISOLATIONLEVEL_SERIALIZABLE, 0, pITxOptions, &pITransaction); … return Greeting; } }

Productivity - WCF Using Visual Studio 2005 and Indigo 1 line security 1 line reliable messaging 1 line transactions Total lines 3 [ServiceContract(SecureChannel, SecurityMode =“Windows")] [Reliability(Guarantees.ExactlyOnce | Guarantees.InOrder)] [ServiceContract] class HelloService { [ServiceOperation(TransactionFlowAllowed = true)] String Hello(String Greeting) { return Greeting; } }

INTEROPERABILITY

Investment Protection SIDE-BY-SIDE Interop UPGRADE

WS-* Protocol Support XML Messaging Security Transactions Reliable Messaging Metadata

Components of Business Interoperability Agreed syntax representations E.g. XML Agreed protocols E.g. SOAP + WS-* specs (such as WS-ReliableMessaging) Agreed payload formats E.g. HL7 schemas for healthcare data Profiled composition E.g. Pre-defined options to ensure functionality Agreed business scenarios E.g. Well defined interaction scenarios / use cases

Agreed syntax representations

E.g. XML

Agreed protocols

E.g. SOAP + WS-* specs (such as WS-ReliableMessaging)

Agreed payload formats

E.g. HL7 schemas for healthcare data

Profiled composition

E.g. Pre-defined options to ensure functionality

Agreed business scenarios

E.g. Well defined interaction scenarios / use cases

Interop Profiles Define a subset of specifications that are: Composable Scoped Work together Examples: Secure RM – WS-ReliableMessaging + WS-Trust/SecureConversation/Security ACORD Messaging Profile – WS-* + ACORD payload schemas Who defines the profile? Vertical domain org – eg. ACORD Horizontal org – eg. WS-I Customer – singly or in groups

Define a subset of specifications that are:

Composable

Scoped

Work together

Examples:

Secure RM – WS-ReliableMessaging + WS-Trust/SecureConversation/Security

ACORD Messaging Profile – WS-* + ACORD payload schemas

Who defines the profile?

Vertical domain org – eg. ACORD

Horizontal org – eg. WS-I

Customer – singly or in groups

Profile Recipe: Staple, Redline, Glue – Device Profile Example “ Staple” Pull relevant specs into scope “ Redline” Add constraints on use of those specs “ Glue” Define missing bits between specs Some will migrate back into specs ThisModel Metadata ThisDevice Metadata Action Filter Conformance Claim Policy Assertions Policy Assertions SOAP 1.2 WS-Addressing WS-Metadata Exchange WSDL 1.1 WS-Discovery WS-Eventing

“ Staple”

Pull relevant specs into scope

“ Redline”

Add constraints on use of those specs

“ Glue”

Define missing bits between specs

Some will migrate back into specs

Why Do We Need Interop Profiles? Need to constrain (soften) runtime options to achieve out-of-box interoperability WS-* Architecture is designed for general applicability across a wide range of industries / scenarios Often too much optionality in the base specifications Tailor to specific domain / environment E.g. Devices Profile only requires SOAP 1.2 not SOAP 1.1 to lower implementation footprint Guide implementation and deployment choices Achieve a proven composition of protocols and payloads Allows simplification of application deployment e.g. WCF allows selection of interop profile to use

Need to constrain (soften) runtime options to achieve out-of-box interoperability

WS-* Architecture is designed for general applicability across a wide range of industries / scenarios

Often too much optionality in the base specifications

Tailor to specific domain / environment

E.g. Devices Profile only requires SOAP 1.2 not SOAP 1.1 to lower implementation footprint

Guide implementation and deployment choices

Achieve a proven composition of protocols and payloads

Allows simplification of application deployment

e.g. WCF allows selection of interop profile to use

SERVICE ORIENTATION

From Objects to Services Polymorphism Encapsulation Subclassing Message-based Schema+Contract+Policy Broad Interop Location Transparent Tight Coupling Runtime Metadata Object-Oriented Service-Oriented Component-Oriented 1980s 2000s 1990s

Polymorphism

Encapsulation

Subclassing

Message-based

Schema+Contract+Policy

Broad Interop

Location Transparent

Tight Coupling

Runtime Metadata

Four Tenets of Service Orientation SERVICE ORIENTATION Compatibility Based On Policy Share Schema & Contract, Not Class Services Are Autonomous Boundaries Are Explicit

WS DEVICES

Connected Devices – Ad-hoc / Unmanaged Environment Example Joe works for a health care provider. He visits a patient at home and uses his laptop to discover and configure a sensor in the client’s location in ad-hoc mode. After device discovery, Joe changes the sensitivity level of the sensor and directs the sensor to send notifications to a monitoring server in his office. Provider’s Office Customer’s Home Notifications Configure Ad-hoc Discovery Sensor

Joe works for a health care provider. He visits a patient at home and uses his laptop to discover and configure a sensor in the client’s location in ad-hoc mode. After device discovery, Joe changes the sensitivity level of the sensor and directs the sensor to send notifications to a monitoring server in his office.

Devices Profile Protocol DMR Capabilities DMR Commands DMR Events Protocol IGD Capabilities IGD Commands IGD Events Assurances Messaging SOAP WS-Security MTOM WS-Addressing Metadata WSDL WS-Metadata Exchange XML Schema TLS Foundation SOAP / HTTP MIME XML Infoset XML 1.0 XML Namespaces BP 1.1 Sec. 4 Device Extensions Protocol Print Capabilities Print Commands Print Events WS-Eventing WS-Transfer WS-Policy SOAP / UDP WS-Discovery

Vista WS device support Printers “ Plug and Play” experience for network printers Security Control over who can connect to the printer Privacy of data sent to the printer Rich printer status Scanners “ Plug and Play” experience for network scanners enable one-button scanning Secure scan delivery

Printers

“ Plug and Play” experience for network printers

Security

Control over who can connect to the printer

Privacy of data sent to the printer

Rich printer status

Scanners

“ Plug and Play” experience for network scanners

enable one-button scanning

Secure scan delivery

Vista WS device support PC Discovery Messenger - People Near Me BITS - Background Intelligent Transfer Service Projectors Integration with current IT systems Remote diagnostics and configuration Asset and usage tracking Speeds flow of meeting Automatic display and audio settings Easy to transition between presenters

PC Discovery

Messenger - People Near Me

BITS - Background Intelligent Transfer Service

Projectors

Integration with current IT systems

Remote diagnostics and configuration

Asset and usage tracking

Speeds flow of meeting

Automatic display and audio settings

Easy to transition between presenters

Resources - Web Services On Devices Web Services http://msdn.microsoft.com/webservices/default.aspx http://msdn.microsoft.com/windowsvista/connected/ Web Services Feedback Workshops http://msdn.microsoft.com/webservices/community/workshops/ Web Services Basics http://msdn.microsoft.com/webservices/understanding/webservicebasics/default.aspx Devices Profile for Web Services http://msdn.microsoft.com/ws/2006/02/devprof/ WS-Discovery http://msdn.microsoft.com/ws/2005/04/ws-discovery/

Web Services

http://msdn.microsoft.com/webservices/default.aspx

http://msdn.microsoft.com/windowsvista/connected/

Web Services Feedback Workshops

http://msdn.microsoft.com/webservices/community/workshops/

Web Services Basics

http://msdn.microsoft.com/webservices/understanding/webservicebasics/default.aspx

Devices Profile for Web Services

http://msdn.microsoft.com/ws/2006/02/devprof/

WS-Discovery

http://msdn.microsoft.com/ws/2005/04/ws-discovery/

THE BIGGER PICTURE – WCF and WINFX

Next Gen Windows Technology Foundation Vector-based Resolution independent Rich media 3D user interfaces Windows Communication Foundation Secure Web services Reliable transacted distributed apps Interoperability with WS-* protocols Any transport and any host Engine built into platform System and human workflow Composite apps Windows Presentation Foundation Windows Workflow Foundation Windows InfoCard Streamlines user registration and one-click login Mitigates common attack vectors (Phishing) Seamless integration with WCF

Vector-based

Resolution independent

Rich media

3D user interfaces

Secure Web services

Reliable transacted distributed apps

Interoperability with WS-* protocols

Any transport and any host

Engine built into platform

System and human workflow

Composite apps

Streamlines user registration and one-click login

Mitigates common attack vectors (Phishing)

Seamless integration with WCF

Services, Workflow & BizTalk WCF WF Tools and engine for building workflow-enable apps API for building secure, reliable interoperable services Application to application and B2B integration Connects multiple services built with WCF Adapters to multiple products like SAP and MQSeries Business activity monitoring Vertical solutions and industry accelerators Message transformation services Enterprise single sign-on End-to-end health and activity tracking And more…

Application to application and B2B integration

Connects multiple services built with WCF

Adapters to multiple products like SAP and MQSeries

Business activity monitoring

Vertical solutions and industry accelerators

Message transformation services

Enterprise single sign-on

End-to-end health and activity tracking

And more…

WinFX Ship Vehicle Down-level support on Windows XP and Windows Server 2003 Consistent development experience Optimizations for Vista Windows Vista introduces breakthroughs in user experience, security and reliability, enabling you to build applications that bring clarity to the user's complex world of information.

Down-level support on Windows XP and Windows Server 2003

Consistent development experience

Optimizations for Vista

Getting WinFX WinFX Beta1 WinFX Ships! July 2005 Nov 2006 WinFX Feb CTP Feb 2006

WinFX Beta1

WinFX Ships!

WinFX Feb CTP

Start programming with Visual Studio 2005 Download and evaluate WinFX Give us your feedback! Take the Next Step

Start programming with Visual Studio 2005

Download and evaluate WinFX

Give us your feedback!

 

Backup Slides

The Four Tenets of Service-Orientation Services and consumers are independently versioned, deployed, operated, and secured. Services are autonomous Data never includes behavior; Objects with data and behavior are a local phenomenon. Share schema & contract, not class Capabilities and requirements represented by a unique public name; Used to establish service suitability. Compatibility based on policy Developers opt-in to consuming, exposing, and defining public-facing service façade. Boundaries are Explicit

Facilitates implementation/platform interop Independent deployment, versioning, mgmt Promotes technology reuse Benefits of Service Orientation

Facilitates implementation/platform interop

Independent deployment, versioning, mgmt

Promotes technology reuse

WCF Architecture Detail Application Service Model Messaging Hosting Environments TCP Channel HTTP Channel Queue Channel Secure Channel Reliable Channel Binary Encoder Text/XML Encoder … … ASP.NET Avalon WinForm NT Service COM+ Instance Behavior Throttling Behavior Type Integ. Behavior Transaction Behavior Concurrency Behavior Error Behavior Metadata Behavior … WAS

End-to-end Security Confidentiality, integrity, authentication, authorization X509, Username/Password, Kerberos, SAML, custom End-to-end Reliable messaging In-order guarantees Exactly once guarantees Transactions Guaranteed atomic success or failure across services WCF Feature Overview Security, Reliability, Transactions

End-to-end Security

Confidentiality, integrity, authentication, authorization

X509, Username/Password, Kerberos, SAML, custom

End-to-end Reliable messaging

In-order guarantees

Exactly once guarantees

Transactions

Guaranteed atomic success or failure across services

WCF Feature Overview Hosting Models Indigo services can be hosted in any managed application ASP.NET, COM+, EXE, NT Service, Windows Forms, Avalon Windows Activation Service – Used by Indigo and IIS7 Windows Activation Service (WAS) HTTP.SYS TCP Transport Listener Named Pipes Transport Listener HTTP Listener Adapter (IIS7) NP Listener Adapter TCP Listener Adapter

Indigo services can be hosted in any managed application

ASP.NET, COM+, EXE, NT Service, Windows Forms, Avalon

Windows Activation Service – Used by Indigo and IIS7

WCF Runtime Overview

WS-* Architecture Assurances Messaging SOAP WS-Security MTOM WS-Addressing Metadata WS-Policy WSDL WS-Discovery UDDI WS-Metadata Exchange WS-Transfer WS-Enumeration WS-Eventing XML Schema WS-Reliable Messaging WS-Coordination WS-Atomic Transaction WS-Business Activity WS-Trust WS-Secure Conversation Infrastructure and Profiles WS-Management WS-Federation Devices Profile Foundation SOAP / HTTP SOAP / UDP MIME XML Infoset XML 1.0 XML Namespaces

WS-* Specifications Process Step 2 Broader Community Participation Step 1 Initial Development Process reconciles conflicting goals Quality of engineering Time to market Breadth of industry support Step 3 Standardization Step 4 Profiling Increasing Industry Participation Specification Published Feedback and Interop Workshops Revise spec Standards Org WS-I Idea

Process reconciles conflicting goals

Quality of engineering

Time to market

Breadth of industry support

WS-* Spec Status Assurances Messaging SOAP WS-Security MTOM WS-Addressing Metadata WS-Policy WSDL WS-Discovery UDDI WS-Metadata Exchange WS-Transfer WS-Enumeration WS-Eventing XML Schema WS-Reliable Messaging WS-Coordination WS-Atomic Transaction WS-Business Activity WS-Trust WS-Secure Conversation Infrastructure and Profiles WS-Management WS-Federation Devices Profile Foundation SOAP / HTTP SOAP / UDP MIME XML Infoset XML 1.0 XML Namespaces Step 4 – Approved Standard Step 3 – Standardization Step 2 – Workshops & Community Dev

80+ WS-* Workshop Participants Actional Fujitsu Newisys Sharp Labs AMD Grand Central Nokia Siebel American Megatrends Hewlett-Packard Oasis Semiconductor Software AG ANL IBM Oblix Sonic Software Apache Project iDesign OPC Foundation Sun Axalto Intel OpenNetwork Systinet BEA Intermec Oracle Tibco Blue Titan Iona OSA Technologies Toshiba Boeing IPO Group Peerless Tyco Safety Systems Brother Jboss Ping Identity Univ of Sydney Canon JibxSoap Printronix VeriSign Choreology KnowNow QuickTree Veritas CommerceOne Layer 7 Tech Quovadx Visa Computer Associates Lexmark Reactivity Vitria Content Guard Lockheed Martin Ricoh WRQ Cornell University Microsoft Roxio webMethods Dell Motive RSA Security WSO2 Epson NEC SAP Xerox Exceptional Innovation NEON Schneider Electric Zoran Feature Software Netegrity SeeBeyond Unaffiliated

Delivering WS-* - Microsoft Microsoft is delivering implementations of all WS-* specs WSE 2.0 / 3.0 Interim coverage of evolving security and policy specs Indigo Full coverage of all SRTP Advanced Web Services specs Security Reliable Messaging Transactions Policy Windows Server 2003 Release 2 WS-Management stack for interoperable system management Windows Longhorn WS-Devices stack for printer and networked device connectivity

Microsoft is delivering implementations of all WS-* specs

WSE 2.0 / 3.0

Interim coverage of evolving security and policy specs

Indigo

Full coverage of all SRTP Advanced Web Services specs

Security

Reliable Messaging

Transactions

Policy

Windows Server 2003 Release 2

WS-Management stack for interoperable system management

Windows Longhorn

WS-Devices stack for printer and networked device connectivity

Microsoft WS-* Product Roadmap VS 2005 + WSE 3.0 SOAP 1.1, 1.2 WSDL 1.1 MTOM WS-Addressing 2004/08 (or REC) WS-Security 1.0 (U/P, X509, Kerberos) WS-Secure Conversation WS-Trust WS-Policy based Limited wire Interop with WSE 2.0 AD Federation Services in R2 Cross-organizational Identity Federation Web SSO SQL Server 2005 SOAP 1.1,1.2 WSDL1.1 WS-Security 1.0 Management WS-Management VS2003 + Web Services Enhancements (WSE) 2.0 SOAP 1.1 WSDL 1.1 WS-Addressing 2004/03 WS-Security 1.0 (U/P, X509, Kerberos) WS-Secure Conversation 2004/04 WS-Trust 2004/04 WS-Policy based Indigo Wire-level interop with WSE3.0 In addition: MTOM SAML Token Profile 1.0 Security Policy WS-Federation Active Client - Enables easy to build STS WS-RM 2005/02, Policy WS-AT/WS-C 2005/02, Policy WS-Policy/PolicyAttachment WS-MEX Easy to use Digital Identity / InfoCard Active Directory: Federation WSD API: Device Profile Longhorn Wave Windows Server 2003 “ R2” Wave

VS 2005 + WSE 3.0

SOAP 1.1, 1.2

WSDL 1.1

MTOM

WS-Addressing 2004/08 (or REC)

WS-Security 1.0 (U/P, X509, Kerberos)

WS-Secure Conversation

WS-Trust

WS-Policy based

Limited wire Interop with WSE 2.0

AD Federation Services in R2

Cross-organizational Identity Federation

Web SSO

SQL Server 2005

SOAP 1.1,1.2

WSDL1.1

WS-Security 1.0

Management

WS-Management

VS2003 + Web Services

Enhancements (WSE) 2.0

SOAP 1.1

WSDL 1.1

WS-Addressing 2004/03

WS-Security 1.0 (U/P, X509, Kerberos)

WS-Secure Conversation 2004/04

WS-Trust 2004/04

WS-Policy based

Indigo

Wire-level interop with WSE3.0

In addition:

MTOM

SAML Token Profile 1.0

Security Policy

WS-Federation Active Client

- Enables easy to build STS

WS-RM 2005/02, Policy

WS-AT/WS-C 2005/02, Policy

WS-Policy/PolicyAttachment

WS-MEX

Easy to use Digital Identity / InfoCard

Active Directory: Federation

WSD API: Device Profile

WS-* - Industry Adoption WS-P Messaging Security Assurances Devices Mgmt Metadata DPWS WS-SecureConv WS-Security WS-Trust WS-RM WS-AT MEX WS-D SOAP / WSDL MTOM © 2003-2006 Microsoft Corporation. All rights reserved. The information contained in this document represents the current view at the time of publication and is subject to change. WS-M WS-XFer / Enum WS-Fed Microsoft   Intel   Sun   Dell   AMD A CA A Sonic A gSOAP  Systinet A WEBM   NetIQ    Released product  Public interop A Co-Author Only Microsoft   IBM   BEA  A Cape Clear  Systinet  Blue Titan  Rogue Wave  Sonic  IONA   JBoss  Choreology  Apache   Tibco  Microsoft     IBM     BEA    A RSA    A Systinet    Apache    Layer7  A  DataPower   CA  A A SUN  SAP  Tibco  IONA  WebMethods  Nokia  Cape Clear  Sonic  gSOAP  Ping ID  A   Netegrity  A A  Verisign  A A A OpenNetwork A A A  Oracle/Oblix     Microsoft   IBM  BEA  SUN   Google  Amazon  eBay  Apache   Whitemesa   gSOAP   Ricoh   Epson   HP   Xerox   Fuji-Xerox   Intel   Canon   Microsoft   Intel   Canon   BEA A WebMethods A Ricoh   Epson   HP   Xerox   Fuji-Xerox   Brother   Toshiba   Exceptional Innovation   Peerless   Schneider   Systinet  gSOAP  Lexmark A Microsoft   IBM A  BEA A  SAP A  Sun A  Verisign A Sonic  Layer 7  Apache  CA A WebMethods A Systinet  gSOAP 

Connected Devices – Ad-hoc / Unmanaged Environment Example Joe works for a health care provider. He visits a patient at home and uses his laptop to discover and configure a sensor in the client’s location in ad-hoc mode. After device discovery, Joe changes the sensitivity level of the sensor and directs the sensor to send notifications to a monitoring server in his office. Provider’s Office Customer’s Home Notifications Configure Ad-hoc Discovery Sensor

Joe works for a health care provider. He visits a patient at home and uses his laptop to discover and configure a sensor in the client’s location in ad-hoc mode. After device discovery, Joe changes the sensitivity level of the sensor and directs the sensor to send notifications to a monitoring server in his office.

Connected Devices – Managed Environment Example Joe works for a health care provider. He visits a patient at home and uses his laptop to discover and configure a sensor via discovery proxy. After device discovery, Joe changes the sensitivity level of the sensor and directs the sensor to send notifications to a monitoring server in his office. Provider’s Office Customer’s Home Notifications Configure Sensor Discover via DP Hello DP

Joe works for a health care provider. He visits a patient at home and uses his laptop to discover and configure a sensor via discovery proxy. After device discovery, Joe changes the sensitivity level of the sensor and directs the sensor to send notifications to a monitoring server in his office.

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