Add an EndpointProvider at Client side for CoAP based on java-coap(fork)

[sbernard31]

This aims to experiment transport abstraction layer implementing another endpoint provider at Client side for CoAP based on java-coap(fork).

See more details at #1373.

[sbernard31]

First try :

• Register, Update, DeRegister is OK ✔️
• Read, Write, Discover, Create, Execute, Delete is OK ✔️
• Composite Operation is OK ✔️
• Bootstrap (and corresponding operation : Read, Write, Discover, Delete) is OK ✔️

Not yet available :

• Observe and Composite Observe ❌
• ⚠️ Some issue with the way we handle BootstrapFinished

[sbernard31]

I rebased this in master (several conflict especially because of Identity Refactoring)

There is also some observe code available at java_coap_client_observe which depends on "not yet released version" of java-coap.

[sbernard31]

With java-coap v6.18.0, I added Observe and Composite Observe support ✔️.

⚠️ We still have some issue with the way we handle BootstrapFinished and there are still some TODO in the code but All integration tests are OK ✔️, So I think this is now in a testable state.

[sbernard31]

This is now integrated in master.

CoAP support based on java-coap(fork) is available in leshan-client-demo through option -jc :

-jc, --use-java-coap   Use java-coap for CoAP protocol instead of
                         Californium.

And then this looks like :

java -jar leshan-client-demo.jar -u leshan.eclipseprojects.io -jc                                                             

Leshan Client Demo Interactive Console :

Commands:
  help     Display help information about the specified command.
  list     List available Objects, Instances and Resources
  create   Enable a new Object
  delete   Disable a new object
  update   Trigger a registration update.
  send     Send data to server
  collect  Collect data to send it later with 'send' command
  move     Simulate client mouvement.

Press Ctl-C to exit.

                  LeshanClient 2023-10-19 18:02:41,263 [INFO] Starting Leshan client ...  
       DefaultEndpointsManager 2023-10-19 18:02:41,589 [INFO] New CoAP over UDP endpoint based on java-coap library created, 
 for server coap://leshan.eclipseprojects.io:5683 at coap://0.0.0.0:57219.  
                  LeshanClient 2023-10-19 18:02:41,598 [INFO] Leshan client[endpoint:mooky] started.  
     DefaultRegistrationEngine 2023-10-19 18:02:41,603 [INFO] Trying to register to coap://leshan.eclipseprojects.io:5683 ...  
     DefaultRegistrationEngine 2023-10-19 18:02:41,709 [INFO] Registered with location '/rd/dwCSg6EIb5'.  
     DefaultRegistrationEngine 2023-10-19 18:02:41,712 [INFO] Next registration update to coap://leshan.eclipseprojects.io:5683 in 53s...