coap: define WITH_POSIX in coap_config.h instead of globally

Author: igrr

components/coap/CMakeLists.txt

@@ -24,10 +24,5 @@ set(COMPONENT_REQUIRES lwip)
 
 register_component()
 
-# Needed for coap headers in public builds, also.
-#
-# TODO: find a way to move this to a port header
-target_compile_definitions(${COMPONENT_TARGET} PUBLIC WITH_POSIX)
-
 # Silence format truncation warning, until it is fixed upstream
 set_source_files_properties(libcoap/src/coap_debug.c PROPERTIES COMPILE_FLAGS -Wno-format-truncation)

components/coap/Makefile.projbuild

@@ -18,10 +18,13 @@
 #ifndef _CONFIG_H_
 #define _CONFIG_H_
 
-#ifdef WITH_POSIX
-#include "coap_config_posix.h"
+/* Always enabled in ESP-IDF */
+#ifndef WITH_POSIX
+#define WITH_POSIX
 #endif
 
+#include "coap_config_posix.h"
+
 #define HAVE_STDIO_H
 #define HAVE_ASSERT_H