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[iot-wg] Californium 2.3.0-RC1 - Released

Dear Californians

in preparation of Californium Release 2.3.0 (16. June), the 2.3.0-RC1 release is available! 
It comes with changes and bugfixes.

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.

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 adapter 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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