[build] add initial CMakeLists.txt

CMakeLists.txt

+set(srcs
+   "dcaf/src/aif.c"
+   "dcaf/src/anybor.c"
+   "dcaf/src/cose.c"
+   "dcaf/src/dcaf.c"
+   "dcaf/src/dcaf_address.c"
+   "dcaf/src/dcaf_coap.c"
+   "dcaf/src/dcaf_crypto_openssl.c"
+   "dcaf/src/dcaf_crypto_mbedtls.c"
+   "dcaf/src/dcaf_crypto_tinydtls.c"
+   "dcaf/src/dcaf_debug.c"
+   "dcaf/src/dcaf_key.c"
+   "dcaf/src/dcaf_mem.c"
+   "dcaf/src/dcaf_optlist.c"
+   "dcaf/src/dcaf_prng.c"
+   "dcaf/src/dcaf_transaction.c"
+   "dcaf/src/dcaf_utf8.c")
+
+idf_component_register(SRCS "${srcs}"
+                    INCLUDE_DIRS "dcaf/include"
+                    PRIV_INCLUDE_DIRS "port/include" "dcaf/include/dcaf"
+                    REQUIRES coap
+                    PRIV_REQUIRES lwip mbedtls)
+
+set(LIBDCAF_PACKAGE_URL "https://dcaf.science")
+set(LIBDCAF_PACKAGE_NAME "${PROJECT_NAME}")
+set(LIBDCAF_PACKAGE_STRING "${PROJECT_NAME} ${PROJECT_VERSION}")
+set(LIBDCAF_PACKAGE_VERSION "${PROJECT_VERSION}")
+set(LIBDCAF_PACKAGE_BUGREPORT "")
+
+configure_file(${COMPONENT_PATH}/dcaf/include/dcaf/libdcaf.h.in ${COMPONENT_PATH}/dcaf/include/dcaf/libdcaf.h)
+
+# TODO: find a way to move this to a port header
+target_compile_definitions(${COMPONENT_LIB} PUBLIC
+  WITH_POSIX
+  COAP_DTLS_MBEDTLS
+  DCAF_PRETTY_PRINT_CBOR=0)
+