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[iot-wg] Californium 2.3.0 released

Dear Californians,

The version 2.3.0 is released and is available at the Eclipse Repo and on maven central.

Changes in DTLS:

-   supports hello_extension for signature and hash algorithms.
    The default changes from "ecdsa_sha256" to "ecdsa_sha256,rsa_sha256".
    It's also possible to configure a different list of supported signature and hash
-   supports x25519 curve for ECDHE (running java 11)
    The default curves changes from "secp256r1,secp384r1,secp521r1" to
    "secp256r1,x25519,x448,secp384r1". It's also possible to configure a
    different list of supported curves.
-   Asynchronous PSK store API, supports returning master secret or secret key
-   CipherSuiteSelector for more control on selecting cipher suite and parameters
    on the server side.

Changes in CoAP:

 -  add (experimental) peer's based deduplicator to limit maximum number of messages
    kept for deduplication.
 -  improve multicast support and add broadcast support.
 -  add picocli command-line-interfaces to plugtest clients and servers.

Changes in OSCORE:

-   more ciphers supported.
-   ID context used to disambiguate retrieving contexts.

Additionally, some bugs have been fixed, please refer to the reflog.

You may fetch the selected binary core artefacts from Maven Central [2] or all binary artefacts, including Californium.Tools and Californium.Actinium, from the Eclipse Repository [3].
Feedback and questions are very welcome!
You’re invited to use github issues [4] for everything ☺. 

You use Californium and want to be listed as adopter on the project page and [5]?
Just fill out a PR as explained in [6].

Mit freundlichen Grüßen / Best regards

 Achim Kraus

Bosch IoT Hub - Product Area IoT Platform (IOC/PAP-HU) Bosch.IO GmbH | Stuttgarter Straße 130 | 71332 Waiblingen | GERMANY |

Sitz: Berlin, Registergericht: Amtsgericht Charlottenburg; HRB 148411 B
Aufsichtsratsvorsitzender: Dr.-Ing. Thorsten Lücke; Geschäftsführung: Dr. Stefan Ferber, Dr. Aleksandar Mitrovic, Yvonne Reckling 

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