How to use the latest version of Californium

[thread_yoda]

Hi, 

I am trying to following the instructions at: https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.iotsdk.v0.9.0%2Fiot_sdk_user_guides_java_coaps.html

but the directory paths of Californium has deviated quite a bit since this was published. Do you have some updated instructions on how to use Californium with your IoT examples?

Thanks very much. 

[Didrik Rokhaug]

Hi.

I am not aware of any updated version of that guide.

However, there doesn't seem to be too big changes in the file structure of the Californium project.

The biggest is probably that the Californium core and Scandium has been gathered into one repo: https://github.com/eclipse/californium

However, except for the top two layers, everything should be the same, and it is quite obvious what the new paths are.

The only path that I had some problems finding the modern equivalent of was californium.core/cf-secure/......./examples.

The new path seems to be https://github.com/eclipse/californium/tree/master/demo-apps/cf-secure/src/main/java/org/eclipse/californium/examples

Are there any other paths, in particular, that are giving you trouble?

Also, it is worth pointing out that you might run into worse problems than just some changed paths. There is a reason why the guide states explicitly which version it was created for.

Best regards,

Didrik

[Achim Kraus]

> Also, it is worth pointing out that you might run into worse problems than just some changed paths. There is a reason why the guide states explicitly which version it was created for.

I'm one of the commiter of Californium. I strongly recommend not to use 5 years old stuff, use our current 2.3.0 release.

[thread_yoda]

Thanks Achim! Yup, I started to just use the Californium release to get my feet wet since as you mentioned I ran into some further issues after attempting to fix the path issue.

I cloned the latest version of californium from github and I was able to successfully run the cf-helloworldserver example and I used Copper (Cu) google chrome extension to access the example hello world resource. This is working fine. 

Next, I went to run cf-secure example. This seems to run fine also. But is there a way to use Copper to test this? Or I need some other tool? 

I think it would be nice if there was some getting started guide with the latest release of californium (and preferably with Nordic Thread capable dev kits). I have further questions like where the Key store are defined and how to setup the various modes, PSK, X.509, etc. I haven't tried the californium-proxy2 but also I think this needs to be shown how to integrate with DTLS, etc.Anyway, I am trying to get some basic understanding and take the first baby steps...

[thread_yoda]

Update: I used SecureClient.java and am able to connect to my SecureServer.java instance now, which is cool! I'm going to try and connect my nRF52840-DK to this secure server and see what happens. I'm not sure what to expect.

[Achim Kraus]

In the current 2.3.0 cf-secure example the PSK store is set in the CredentialsUtil.setupCredentials

InMemoryPskStore pskStore = new InMemoryPskStore();
pskStore.setKey(PSK_IDENTITY, PSK_SECRET);
pskStore.setKey(OPEN_PSK_IDENTITY, OPEN_PSK_SECRET);
config.setPskStore(pskStore);

> I think it would be nice if there was some getting started guide with the latest release of californium

Unfortunately, though not too many are actively working "on" Californium, I will not be able to write such a guide for the next release, 2.4.0 planned for Thursday, 27.8.