nes-proj/os/net/app-layer/coap/Makefile.coap

MAKE_WITH_DTLS ?= 0

ifeq ($(MAKE_WITH_DTLS),1)

 TINYDTLS_PATH := os/net/security/tinydtls

 ifeq (${wildcard $(CONTIKI)/$(TINYDTLS_PATH)/Makefile},)
  ${error Could not find the tinyDTLS submodule. Please run "git submodule update --init" and try again}
 endif

 CFLAGS += -DWITH_DTLS=1

 MODULES += os/net/app-layer/coap/tinydtls-support
 MODULES += $(TINYDTLS_PATH) ${addprefix $(TINYDTLS_PATH)/,aes sha2 ecc}

 MAKE_COAP_DTLS_KEYSTORE_NONE   := 0
 MAKE_COAP_DTLS_KEYSTORE_SIMPLE := 1
 MAKE_COAP_DTLS_KEYSTORE_LWM2M  := 2

 MAKE_COAP_DTLS_KEYSTORE ?= MAKE_COAP_DTLS_KEYSTORE_LWM2M

 ifeq ($(MAKE_COAP_DTLS_KEYSTORE),MAKE_COAP_DTLS_KEYSTORE_SIMPLE)
  CFLAGS += -DCOAP_DTLS_KEYSTORE_CONF_WITH_SIMPLE=1
 else ifeq ($(MAKE_COAP_DTLS_KEYSTORE),MAKE_COAP_DTLS_KEYSTORE_LWM2M)
  CFLAGS += -DCOAP_DTLS_KEYSTORE_CONF_WITH_LWM2M=1
 else ifeq ($(MAKE_COAP_DTLS_KEYSTORE),MAKE_COAP_DTLS_KEYSTORE_NONE)
  # No C flag needed for no keystore
 else
  ${error Unsupported CoAP DTLS keystore: $(MAKE_COAP_DTLS_KEYSTORE)}
 endif
endif