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We have an application on java springboot which would interact with IoT devices via HTTP Rest API. However, there is an IoT device that communicates with the LWM2M protocol. So, I need to set up an LWM2M server and make the application an LWM2M client. First I wanted to make a prototype on my local machine running application on Windows with eclipse ide. I tried importing the Leshan project from this link on eclipse workspace. However when maven clean install, it is not creating a jar file for every project. Attaching the result at eclipse console, when I do maven clean install.result of maven clean install. My ask is:

  1. Am I going the right way, in order to implement the LWM2M protocol locally?
  2. How to resolve all jars not creating with Maven clean Install.
Rajnish
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3 Answers3

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Our commercial LWM2M offering that is part of Cumulocity IoT in fact is a Spring Boot application which includes Leshan. So you are definitely on the right track.

While I am not able to disclose internals, I am happy to provide you some pointers how to get this flying.

  1. In your pom.xml, declare the needed Leshan dependencies, for example:

        <dependency>
             <groupId>org.eclipse.leshan</groupId>
             <artifactId>leshan-core</artifactId>
             <version>2.0.0-M9</version>
         </dependency>
         <dependency>
             <groupId>org.eclipse.leshan</groupId>
             <artifactId>leshan-server-core</artifactId>
             <version>2.0.0-M9</version>
         </dependency>
         <dependency>
             <groupId>org.eclipse.leshan</groupId>
             <artifactId>leshan-server-cf</artifactId>
             <version>2.0.0-M9</version>
         </dependency>
         <dependency>
             <groupId>org.eclipse.leshan</groupId>
             <artifactId>leshan-server-redis</artifactId>
             <version>2.0.0-M9</version>
         </dependency>
         <dependency>
             <groupId>org.eclipse.californium</groupId>
             <artifactId>californium-core</artifactId>
             <version>3.7.0</version>
         </dependency>
         <dependency>
             <groupId>org.eclipse.californium</groupId>
             <artifactId>scandium</artifactId>
             <version>3.7.0</version>
         </dependency>

  1. I assume you know how to set up a Spring Boot application using maven. If not, this tutorial shows precisely how it can be done.

  2. In your spring boot application you then can construct a LeshanServer object and accept LWM2M traffic. Have a look at the leshan-server-demo maven module in the Eclipse Leshan source code on how to do that.

eliasw
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Questions about build issues get much better help and answers, if you use Eclipse/Leshan - github issues. Not all open-source projects are watching stackoverflow and so you can get a "first hand first class" answers only there.

Achim Kraus
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I have skipped the integration testing by commenting its dependency in the pom file. Then all other modules got compiled.

Rajnish
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