This document provides instructions for setting up the Constrained Application Protocol (CoAP) library Californium on Eclipse to run a Hello World example. It involves downloading Eclipse and the Maven plugin, getting the Californium source code from GitHub, importing it into Eclipse as a Maven project, downloading and importing the Californium Element Connector dependency, running the Hello World example, and accessing it through a CoAP user agent like Copper.

1. The Constrained Application Protocol
(CoAP)- ongoing implementation
Khamdamboy Urunov, a Ph.D. student.
Special Communication Research
Center.,
Graduate School of Financial
Information Security., Kookmin
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2. 1. Download Eclipse for Java developers
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http://www.eclipse.org/downloads/packages/eclipse-ide-java-developers/mars1

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Compiling the Californium
is not required in order to
use it, use Apache Maven
and add the dependency:
2. Install Maven plugin for Eclipse
Compiling Californium is required in order to use it
plugin Maven.
Run Eclipse, click Help-> Install New Software…, in the
Work with: field, enter the following website:
http://download.eclipse.org/technology/m2e/releases

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2. Install Maven plugin for Eclipse (2)

5. 3. Download CoAP library
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On windows, download the .zip file directly from the github page:
https://github.com/eclipse/californium.core
Then unzip it.

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4. Import the Californium to Eclipse:
Click File -> Import…, you would see the following dialog.
Select Maven->Existing Maven Project, then
click Next.
In the Root Directory:, browse to your
californium-master folder. Check all the
pom.xml files, then click Finish.

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4. Import the Californium to Eclipse: (2)
You would see all the Californium
libraries and projects are listed on the
left.

8. 5. Download and Import the Californium Element Connector
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The connector is necessary for all the Californium projects. Download it from the following
link:
Unzip it, and use import the whole library to Eclipse using Maven.
https://github.com/eclipse/californium.element-connector

9. 6. Run Hello World
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Select the Hello World example, double click it, the code is already compiled automatically
by Eclipse.
Click Run -> Run, you will have a Coap server running on your computer.

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6. Run Hello World (2)

11. 7. Install Copper user-agent add-ons on
Firefox.
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12. 8. Access the “HelloWorld” server through Copper
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coap://californium.eclipse.org:5683/
same as
coap://vs0.inf.ethz.ch:5683/
coap://coap.me:5683/
coap://113.198.211.18:5683/
coap://192.168.17.1:5683/.well-known/core

13. coap://californium.eclipse.org:5683/
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14. coap://vs0.inf.ethz.ch:5683/
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15. coap://coap.me:5683/
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16. Eclipse Hello world:
113.198.211.18:5683
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17. Stop running HelloWorld source code
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18. Unreachable result
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