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Signed-off-by: Achim Kraus <>
Latest commit 9f6f90e Jun 22, 2018

Californium logo

Eclipse Californium is a Java implementation of RFC7252 - Constrained Application Protocol for IoT Cloud services. Thus, the focus is on scalability and usability instead of resource-efficiency like for embedded devices. Yet Californium is also suitable for embedded JVMs.

More information can be found at and

Build using Maven

You need to have a working maven installation to build Californium. Then simply run the following from the project's root directory:

$ mvn clean install

Executable JARs of the examples with all dependencies can be found in the demo-apps/run folder.

Using Californium in Maven Projects

We are publishing Californium's artifacts for milestones and releases to Maven Central. To use the latest released version as a library in your projects, add the following dependency to your pom.xml (without the dots):


If you want to give the most recent milestone a try, use version 2.0.0-M10 instead.

Please Note: in the meantime, a lot of new bugfixes and improvements has been made in branch 2.0.x, which had affected the API and could not be back-ported to the other branches. Even if 2.0.x is still under development, we recommend to focus on using the 2.0.x branch, especially for larger changes.

Current Builds

You can also be bold and try out the most recent build from 2.0.x. However, we are not publishing those to Maven Central but to Californium's project repository at Eclipse only. You will therefore need to add the Eclipse Repository to your pom.xml first:

      <name>Californium Repository</name>

You can then simply depend on 2.0.0-SNAPSHOT.


The project can be easily imported into a recent version of the Eclipse IDE. Make sure to have the following before importing the Californium (Cf) projects:

Then choose [Import... » Maven » Existing Maven Projects] to import californium into Eclipse.


The project can also be imported to IntelliJ as follows:

In IntelliJ, choose [File.. » Open] then select the location of the cloned repository in your filesystem. IntelliJ will then automatically import all projects and resolve required Maven dependencies.

Interop Server

A test server is running at coap:// It is an instance of the cf-plugtest-server from the demo-apps. The root resource responds with its current version. More information can be found at

Another interop server with a different implementation can be found at coap:// More information can be found at


A bug, an idea, an issue? Join the Mailing list or create an issue here on GitHub.


Please check out our contribution guidelines