Commits on Jun 21, 2022

1. RFC9175: Add in support for the Echo and Request-Tag options …

   A unique Request-Tag is added to any PUT/POST/FETCH request that contains
   a large body.  The server is then able to differentiate between concurrent
   sending of large data using the same session.
   
   If a server responds with a 4.01 and includes an Echo option, then the libcoap
   client retransmits the request adding in the received Echo option with the same
   value.
   
   If the server responds normally with an Echo option, then the next request
   from the libcoap client (internally added by libcoap) will contain that Echo
   option.
   
   It is the responsibility of the server application to add in the Echo
   option if required and validate the next request unless the Echo is triggered
   by OSCORE (RFC8613 Appendix B.1.2).

   

   mrdeep1 committed Jun 21, 2022
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