components/coap/port/coap_mbedtls.c:
Add in additional compile time check wrappers for different MbedTLS
configurations.
components/coap/CMakeLists.txt:
components/coap/component.mk:
components/coap/port/coap_notls.c:
components/coap/port/include/coap_config_posix.h:
Add in the ability to compile and run if MbedTLS does not have any TLS
mode enabled.
examples/protocols/coap_client/main/coap_client_example_main.c:
Inform user that MbedTLS Client Mode is required for DTLS if not enabled,
and coaps:// has been requested.
[Lower libcoap library will still error and report this condition]
examples/protocols/coap_server/main/coap_server_example_main.c:
Inform user that MbedTLS Server Mode is required for DTLS if not enabled.
[Lower libcoap library will still error and report this condition]
Closes https://github.com/espressif/esp-idf/issues/3961
Closes https://github.com/espressif/esp-idf/issues/3971
Closes https://github.com/espressif/esp-idf/pull/3977
