Fixed BACnet/SC secure connect VMAC, UUID, and initialization sequence (#1142)

* Refactored the BACnet/SC datalink initialization order by moving certificate file checks and hub connection registration to occur after datalink initialization
* Replaced stdlib rand() with platform-specific cryptographically secure random functions (RtlGenRandom for Windows, getrandom for Linux, arc4random_buf for BSD) to generate UUID and VMAC addresses, preventing duplicates that broke connections
* Enabled conditional debug output in BACnet/SC components when BUILD=debug is specified

src/bacnet/basic/object/bacfile.c

@@ -558,15 +558,12 @@ uint32_t bacfile_write(
 BACNET_UNSIGNED_INTEGER bacfile_file_size(uint32_t object_instance)
 {
     const char *pathname = NULL;
-    long file_position = 0;
     BACNET_UNSIGNED_INTEGER file_size = 0;
 
     pathname = bacfile_pathname(object_instance);
     if (pathname) {
-        file_position = bacfile_file_size_callback(pathname);
-        if (file_position >= 0) {
-            file_size = (BACNET_UNSIGNED_INTEGER)file_position;
-        }
+        file_size =
+            (BACNET_UNSIGNED_INTEGER)bacfile_file_size_callback(pathname);
     }
 
     return file_size;

src/bacnet/basic/object/sc_netport.h

@@ -19,6 +19,25 @@
 #include "bacnet/datalink/bsc/bsc-conf.h"
 #include "bacnet/datalink/bsc/bvlc-sc.h"
 
+#ifndef SC_NETPORT_BVLC_MAX
+#define SC_NETPORT_BVLC_MAX 1500
+#endif
+#ifndef SC_NETPORT_NPDU_MAX
+#define SC_NETPORT_NPDU_MAX 1500
+#endif
+#ifndef SC_NETPORT_CONNECT_TIMEOUT
+#define SC_NETPORT_CONNECT_TIMEOUT 5
+#endif
+#ifndef SC_NETPORT_HEARTBEAT_TIMEOUT
+#define SC_NETPORT_HEARTBEAT_TIMEOUT 60
+#endif
+#ifndef SC_NETPORT_DISCONNECT_TIMEOUT
+#define SC_NETPORT_DISCONNECT_TIMEOUT 150
+#endif
+#ifndef SC_NETPORT_RECONNECT_TIME
+#define SC_NETPORT_RECONNECT_TIME 2
+#endif
+
 /* BACnet file instance numbers */
 #ifndef BSC_ISSUER_CERTIFICATE_FILE_1_INSTANCE
 #define BSC_ISSUER_CERTIFICATE_FILE_1_INSTANCE \