Version 1.5.1

Added dynamic memory management for shutters (functions in shutter.c).
Code is now much easier to tailor to specific needs and works better in the limited RAM of routers.
Memory leaks were not found by Valgrind Memcheck.

shutter.c

@@ -0,0 +1,35 @@
+//
+// Created by lacko on 18/09/2021.
+//
+#include "shutter.h"
+#include "stdlib.h"
+
+shutter *create_shutter (byte ch, byte rolltime_down)
+{
+  shutter *new_shutter = calloc (1, sizeof (shutter));
+  new_shutter->ch = ch;
+  new_shutter->rolltime_down = rolltime_down;
+  return new_shutter;
+}
+
+void append_shutter (shutter **head, shutter *new_shutter)
+{
+  if (*head == NULL)
+    {
+      *head = new_shutter;
+      return;
+    }
+  shutter *tmp = *head;
+  while (tmp->next != NULL)
+    tmp = tmp->next;
+  tmp->next = new_shutter;
+}
+
+void free_shutters (shutter *head)
+{
+  for (shutter *tmp = head; head != NULL; tmp = head)
+    {
+      head = head->next;
+      free (tmp);
+    }
+}