O'REILLY Getting Started with the Internet of Things.pdf

Getting

Started with

the Internet

of Things

Cuno Pister

Getting Started with the

Internet of Things

by Cuno Pfister

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Print History: May 2011: First Edition.

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ISBN: 978-1-4493-9357-1

[LSI]

Contents

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

I / Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1 / Hello World. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Setting Up the Development Environment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

HelloWorld . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Building the Program in Visual Studio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Deploying to the Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2 / Writing to Actuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

BlinkingLed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3 / Reading from Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

LightSwitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

VoltageReader. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

II / Device as HTTP Client . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

4 / The Internet of Things . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

HTTP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Push Versus Pull . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

5 / Pachube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

6 / Hello Pachube. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Setting Up the Network Coniguration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

HelloPachube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

What Netduino Said to Pachube. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

What Pachube Said to Netduino. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

7 / Sending HTTP Requests—The Simple Way . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

SimplePutRequest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Making Web Requests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64

8 / Sending HTTP Requests—The Eficient Way. . . . . . . . . . . . . . . . . . . . . . . . . . 71

EficientPutRequest. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

9 / Hello Pachube (Sockets Version) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

PachubeClient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Contents iii

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