Feature/bip6 debug enable (#209)

* Added BACNET_BIP6_DEBUG environment variable to enhance BACnet/IPv6 debugging

* Added BACNET_BIP6_DEBUG environment variable to enhance BACnet/IPv6 debugging

Co-authored-by: Steve Karg <skarg@users.sourceforge.net>

src/bacnet/datalink/bip6.h

@@ -102,6 +102,10 @@ extern "C" {
     void bip6_receive_callback(
         void);
 
+    BACNET_STACK_EXPORT
+    void bip6_debug_enable(
+        void);
+
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */

src/bacnet/datalink/dlenv.c

@@ -431,6 +431,11 @@ void dlenv_init(void)
 #endif
 #if defined(BACDL_BIP6)
     BACNET_IP6_ADDRESS addr;
+    pEnv = getenv("BACNET_BIP6_DEBUG");
+    if (pEnv) {
+        bip6_debug_enable();
+        bvlc6_debug_enable();
+    }
     pEnv = getenv("BACNET_BIP6_BROADCAST");
     if (pEnv) {
         bvlc6_address_set(&addr, (uint16_t)strtol(pEnv, NULL, 0), 0, 0, 0, 0, 0,