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

apps/Makefile

@@ -43,8 +43,7 @@ ifeq (${BACDL},bip6)
 BACDL_DEFINE=-DBACDL_BIP6=1
 endif
 ifeq (${BACDL},bsc)
-BACDL_DEFINE=-DBACDL_BSC=1
-BACNET_DEFINE=-DBACFILE=1
+BACDL_DEFINE=-DBACDL_BSC=1 -DBACFILE=1
 endif
 ifeq (${BACDL},zigbee)
 BACDL_DEFINE=-DBACDL_ZIGBEE=1
@@ -206,6 +205,17 @@ DEBUGGING = -g -DDEBUG_ENABLED=1
 ifeq (${BACDL},bip)
 BACNET_DEFINES += -DBIP_DEBUG
 endif
+ifeq (${BACDL},bsc)
+CFLAGS += -DDEBUG_BSC_DATALINK=1
+CFLAGS += -DDEBUG_BSC_EVENT=0
+CFLAGS += -DDEBUG_BSC_HUB_CONNECTOR=0
+CFLAGS += -DDEBUG_BSC_HUB_FUNCTION=0
+CFLAGS += -DDEBUG_BSC_NODE_SWITCH=0
+CFLAGS += -DDEBUG_BSC_NODE=0
+CFLAGS += -DDEBUG_BSC_SOCKET=0
+CFLAGS += -DDEBUG_WEBSOCKET_CLIENT=0
+CFLAGS += -DDEBUG_WEBSOCKET_SERVER=0
+endif
 endif
 
 ifeq (${LEGACY},true)

apps/sc-hub/README.md

@@ -2,23 +2,23 @@
 
 Test BACnet/SC using the following steps:
 
- * Build apps for bsc datalink:
+ * Build all the apps and the hub for the BACnet/SC datalink:
 
-        make bsc
+       make clean bsc sc-hub
 
- * Run hub app:
+ * Run the BACnet/SC hub application:
 
         cd bin
         ./bsc-server.sh
         ./bacschub 1 Hubster
 
- * Run server app:
+ * Run BACnet/SC server application:
 
         cd bin
         ./bsc-client.sh
         ./bacserv 123 Francine
 
- * Run any client:
+ * Run any BACnet/SC client:
 
         cd bin
         ./bsc-client.sh