ifeq (2, $(words $(filter ipv4 ipv6, $(USEMODULE))))
  $(shell $(COLOR_ECHO) "$(COLOR_YELLOW)Due to limitations in the gcoap API it is currently not \
                         possible to use a dual stack setup$(COLOR_RESET)" 1>&2)
endif

CONFIG_GCOAP_PDU_BUF_SIZE := $(or $(CONFIG_GCOAP_PDU_BUF_SIZE),128)
# the initial DTLS handshake may exceed the block size
DTLS_MAX_BUF ?= $(shell echo $$(((${CONFIG_GCOAP_PDU_BUF_SIZE} + 36) > 200 ? (${CONFIG_GCOAP_PDU_BUF_SIZE} + 36) : 200 )))