Allow override for STACK_SIZE and PRIORITY defines
/**
* @brief A value representing the system default for new thread priority.
*/
+#ifndef IOT_THREAD_DEFAULT_PRIORITY
#define IOT_THREAD_DEFAULT_PRIORITY 0
+#endif
/**
* @brief A value representhing the system default for new thread stack size.
*/
+#ifndef IOT_THREAD_DEFAULT_STACK_SIZE
#define IOT_THREAD_DEFAULT_STACK_SIZE 0
+#endif
/**
* @ingroup platform_datatypes_handles
