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Mastering Internet of Things

You're reading from  Mastering Internet of Things

Product type Book
Published in Mar 2018
Publisher Packt
ISBN-13 9781788397483
Pages 410 pages
Edition 1st Edition
Languages
Author (1):
Peter Waher Peter Waher
Profile icon Peter Waher

Table of Contents (24) Chapters

Title Page
Copyright and Credits
Dedication
Packt Upsell
Contributors
Preface
1. Preparing Our First Raspberry Pi Project 2. Creating a Sensor to Measure Ambient Light 3. Creating an Actuator for Controlling Illumination 4. Publishing Information Using MQTT 5. Publishing Data Using HTTP 6. Creating Web Pages for Your Devices 7. Communicating More Efficiently Using CoAP 8. Interoperability 9. Social Interaction with Your Devices Using XMPP 10. The Controller 11. Product Life Cycle 12. Concentrators and Bridges 13. Using an Internet of Things Service Platform 14. IoT Harmonization 15. Security for the Internet of Things 16. Privacy 1. Other Books You May Enjoy Index

Adding dynamic synchronous resources


To publish resources through our web server, we just call the Register method on the HttpServer object. We can choose between two methods: either we provide resource objects, inherited from the HttpResource class, such as the HttpSynchronousResource or HttpAsychronousResource classes, or we use lambda expressions or delegates for simple GET and POST resources.

We first demonstrate the latter to publish a resource for reading momentary sensor data. We provide a lambda expression, taking a request and response parameter. This expression will be executed when a GET method is received on the /Momentary resource:

this.httpServer.Register("/Momentary", (req, resp) => 
{ 
   ... 
}); 

Note

The resource will be added as a synchronous resource. This means that the response must be generated completely before returning from the expression. We don't have to worry about exceptions or explicitly sending the response. The web server will do that for us if we forget...

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