Simplest Zephyr module + bacnet_stack config and hello sample

zephyr/samples/hello_bacnet_stack/CMakeLists.txt

@@ -0,0 +1,25 @@
+# SPDX-License-Identifier: MIT
+
+cmake_minimum_required(VERSION 3.13.1)
+
+get_filename_component(MY_PROJECT_BASENAME ${CMAKE_CURRENT_SOURCE_DIR} NAME)
+
+# Find the directory of the Zephyr module
+string(REGEX REPLACE 
+    "\/zephyr\/samples\/[a-zA-Z_\-]*${MY_PROJECT_BASENAME}$" ""
+    MY_ZEPHYR_MODULE_SOURCE_DIR
+    ${CMAKE_CURRENT_SOURCE_DIR})
+
+list(APPEND ZEPHYR_EXTRA_MODULES
+    ${MY_ZEPHYR_MODULE_SOURCE_DIR}
+  )
+
+# Add an absolute directory path to the CMake variable
+# SYSCALL_INCLUDE_DIRS. This ensures that the syscall machinery will
+# be able to find the module's syscalls.
+#TODO: list(APPEND SYSCALL_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR})
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(${MY_PROJECT_BASENAME})
+
+target_sources(app PRIVATE src/main.c)