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[iot-wg] 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,
• 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

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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