Some of the Zephyr include files need to be C++, not C based. The 'extern "C"'
wrapper in include/coap3/coap.h means that all #include are treated as being C.
Remove 'extern "C"' wrapper from include/coap3/coap.h and add wrapper to
include files after #include and before any function / structure definitions.
Add in a C++ build test for CI.
Add in limited caching for multiple clients requesting an Observe subscription
for the same upstream session resource so that only a single observation request
is sent upstream and any unsolicited response is sent back to all the
requesting clients.
This requires a change in the recently added handler registered to
coap_register_proxy_response_handler(), which no longer should no longer call
coap_proxy_forward_response(), but just return a PDU for forwarding on.
Allow re-establishment with upstream server when server restarts.
When upstream server re-connects, re-establish any (D)TLS sessions
and active observe subscriptions.
Supported by a new function coap_context_set_session_reconnect_time().
Tidy up naming to reduce confusion between supported proxy types.
Provides simpler proxy examples.
Fixes issue with COAP_PROXY_REVERSE_STRIP.
Support upstream server using AF_UNIX.
Group together and document the run-time checks available for checking
the libcoap built-in functionality based on the ./cconfigure and / or
CMakeLists.txt options.
Create include/coap3/coap_defines.h file that contains a list of
COAP_ #defines created from the options defined when running ./configure
or cmake.
Add additional coap_*_is_supported() functions.
Tidy up the general proxy logic by moving common functionality
into libcoap.
New functions coap_proxy_forward_request(), coap_proxy_forward_response()
and coap_proxy_is_supported() added.
New --enable-proxy-code support added to configure.
New ENABLE_PROXY_CODE support added to CMakeLists.txt.
Support for common shared connection to next hop.
Support for round-robin balancing across multiple next hops.
Jon Shallow