--- a/lib/C/iec_types.h	Fri Jul 22 09:24:12 2022 +0200
+++ b/lib/C/iec_types.h	Fri Apr 05 12:05:28 2024 +0200
@@ -49,7 +49,7 @@
 #endif
 
 #ifndef STR_LEN_TYPE
-#define STR_LEN_TYPE int8_t
+#define STR_LEN_TYPE uint8_t
 #endif
 
 #define __INIT_REAL 0