nimble: make nimble porting example optional

Enabled by default for the moment to avoid CI errors

wireless/bluetooth/nimble/Kconfig

@@ -7,13 +7,23 @@ config NIMBLE
 		host-layer stack.
 
 if NIMBLE
-config NIMBLE_STACKSIZE
-	int "nimble stack size"
-	default DEFAULT_TASK_STACKSIZE
 
 config NIMBLE_REF
 	string "Version"
 	default "bc7828341226d860429c63994065f8f1b8b8d7b0"
 	---help---
 		Git ref name to use when downloading from nimBLE repo
-endif
+
+config NIMBLE_PORTING_EXAMPLE
+	bool "Apache nimBLE NuttX porting example"
+	default y
+
+if NIMBLE_PORTING_EXAMPLE
+
+config NIMBLE_PORTING_EXAMPLE_STACKSIZE
+	int "Apache NimBLE NuttX porting example stack size"
+	default DEFAULT_TASK_STACKSIZE
+
+endif # NIMBLE_PORTING_EXAMPLE
+
+endif # NIMBLE

wireless/bluetooth/nimble/Makefile

@@ -20,18 +20,24 @@
 
 include $(APPDIR)/Make.defs
 
-PRIORITY  = 255
-STACKSIZE = $(CONFIG_NIMBLE_STACKSIZE)
-
 NIMBLE_UNPACKDIR = mynewt-nimble
 NIMBLE_ROOT = $(APPDIR)/wireless/bluetooth/nimble/$(NIMBLE_UNPACKDIR)
-
--include $(NIMBLE_ROOT)/porting/examples/nuttx/Make.defs
-
 CONFIG_NIMBLE_REF := $(patsubst "%",%,$(strip $(CONFIG_NIMBLE_REF)))
 NIMBLE_TAR := $(CONFIG_NIMBLE_REF).tar.gz
 NIMBLE_URL := https://github.com/apache/mynewt-nimble/archive/$(NIMBLE_TAR)
 
+ifneq ($(CONFIG_NIMBLE_PORTING_EXAMPLE),)
+# Nimble porting example built-in application
+
+-include $(NIMBLE_ROOT)/porting/examples/nuttx/Make.defs
+PRIORITY  = 255
+STACKSIZE = $(CONFIG_NIMBLE_PORTING_EXAMPLE_STACKSIZE)
+
+# nimBLE assumes this flag since it expects undefined macros to be zero value
+
+CFLAGS += -Wno-pointer-to-int-cast -Wno-undef
+endif
+
 $(NIMBLE_TAR):
 	$(Q) curl -L $(NIMBLE_URL) -o $(NIMBLE_TAR)
 
@@ -49,8 +55,4 @@ distclean::
 	$(call DELDIR,$(NIMBLE_UNPACKDIR))
 endif
 
-# nimBLE assumes this flag since it expects undefined macros to be zero value
-
-CFLAGS += -Wno-pointer-to-int-cast -Wno-undef
-
 include $(APPDIR)/Application.mk