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[iot-pmc] Californium 2.4.0 released

Dear Californians,

The version 2.4.0 is released and is available at the Eclipse Repo and on maven central.

Changes in DTLS:
• handshake messages now supports multiple fragments in one record, RFC 6347, 4.2.3
• handshake message retransmission back off with smaller record size, RFC 6347, 4.1.1.1
• handshake message retransmission implementation moved from DTLSConnector to Handshaker.
• MTU clean up
• RFC 8449, record size limit
• interoperability tests with libcoap+tinydtls
• add experimental/early access support for EdDSA with java 15, or external library net.i2p.crypto.eddsa.

Changes in CoAP:
• Failover of transfer to blockwise for 4.13
• Add caching and readme to Proxy2. Update guava to 28.2-android

Introduction of maven-toolchains-plugin with new build options see https://github.com/eclipse/californium#build-using-maven

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].
 
[1] https://projects.eclipse.org/projects/iot.californium/releases/2.4.0
[2] https://search.maven.org/search?q=g:org.eclipse.californium%20v:2.4.0
[3] https://repo.eclipse.org/content/groups/californium/org/eclipse/californium/
[4] https://github.com/eclipse/californium/issues
[5] https://iot.eclipse.org/adopters/
[6] https://github.com/EclipseFdn/iot.eclipse.org#project-adopters

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 | www.bosch.io

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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