Feature/refactor bacnet ipv4 add unit tests (#64)

* refactor BACnet/IPv4 BVLC into encode-decode library with unit tests
Added Read-Broadcast-Distribution-Table encoding and unit test.
Added Read-Broadcast-Distribution-Table-Ack encoding and unit test.
Added Read-Foreign-Device-Table-Ack encoding and unit test.
Added some BDT/FDT diff copy functions with unit tests
Added some FDT add and delete entry functions with unit tests
Added some BDT set append and clear entry functions with unit tests
Added some BIPv4 address conversion functions with unit tests
Added non-BBMD handling unit test
Added basic unit test for BBMD handler
Added BBMD broadcast mask get set and unit tests
Added IPv6 maintenance timer.
Added ReadFDT app
Fixed ReadBDT app
Added Who-Is to Makefile for individual app build
Fixed debugging code blocks projects by swapping bip.c for h_bbmd.c module.
Ported BACnet/IPv4 to refactored BVLC for Linux, BSD, Windows
Fix datalink debug for DLENV module
Improve BIPv4 linux driver debug info
Added BDT mask functions
Reduce debug info clutter in Who-Is app by using environment option
Fix TTL seconds upper bounds addition
Fix CIDR prefix calculation on Linux BIPv4.
Convert BSD BIPv4 to BVLCv4
Fix CMake build for BIPv4 (Linux, BSD, Windows)
Added [U]nsigned to 0xBAC0 constants
Cleanup POSIX and Win32 API sockets
Remove unnecessary file scope variable initialization
Fix routed NPDU to depend on datalink; fix warning
Remove OS dependent network code from gateway
Enable BBMD client in library by default
Co-authored-by: Steve Karg <skarg@users.sourceforge.net>
Co-authored-by: Steve Karg <steve.karg@legrand.us>

src/bacnet/datalink/datalink.h

@@ -37,6 +37,7 @@
 #define datalink_cleanup ethernet_cleanup
 #define datalink_get_broadcast_address ethernet_get_broadcast_address
 #define datalink_get_my_address ethernet_get_my_address
+#define datalink_maintenance_timer(s)
 
 #elif defined(BACDL_ARCNET)
 #include "bacnet/datalink/arcnet.h"
@@ -47,6 +48,7 @@
 #define datalink_cleanup arcnet_cleanup
 #define datalink_get_broadcast_address arcnet_get_broadcast_address
 #define datalink_get_my_address arcnet_get_my_address
+#define datalink_maintenance_timer(s)
 
 #elif defined(BACDL_MSTP)
 #include "bacnet/datalink/dlmstp.h"
@@ -57,19 +59,16 @@
 #define datalink_cleanup dlmstp_cleanup
 #define datalink_get_broadcast_address dlmstp_get_broadcast_address
 #define datalink_get_my_address dlmstp_get_my_address
+#define datalink_maintenance_timer(s)
 
 #elif defined(BACDL_BIP)
 #include "bacnet/datalink/bip.h"
 #include "bacnet/datalink/bvlc.h"
+#include "bacnet/basic/bbmd/h_bbmd.h"
 
 #define datalink_init bip_init
-#if defined(BBMD_ENABLED) && BBMD_ENABLED
-#define datalink_send_pdu bvlc_send_pdu
-#define datalink_receive bvlc_receive
-#else
 #define datalink_send_pdu bip_send_pdu
 #define datalink_receive bip_receive
-#endif
 #define datalink_cleanup bip_cleanup
 #define datalink_get_broadcast_address bip_get_broadcast_address
 #ifdef BAC_ROUTING
@@ -80,6 +79,7 @@ void routed_get_my_address(
 #else
 #define datalink_get_my_address bip_get_my_address
 #endif
+#define datalink_maintenance_timer(s) bvlc_maintenance_timer(s)
 
 #elif defined(BACDL_BIP6)
 #include "bacnet/datalink/bip6.h"
@@ -90,6 +90,7 @@ void routed_get_my_address(
 #define datalink_cleanup bip6_cleanup
 #define datalink_get_broadcast_address bip6_get_broadcast_address
 #define datalink_get_my_address bip6_get_my_address
+#define datalink_maintenance_timer(s) bvlc6_maintenance_timer(s)
 
 #elif defined(BACDL_ALL) || defined(BACDL_NONE)
 #include "bacnet/npdu.h"
@@ -107,28 +108,37 @@ extern "C" {
         BACNET_NPDU_DATA * npdu_data,
         uint8_t * pdu,
         unsigned pdu_len);
+
     BACNET_STACK_EXPORT
     uint16_t datalink_receive(
         BACNET_ADDRESS * src,
         uint8_t * pdu,
         uint16_t max_pdu,
         unsigned timeout);
+
     BACNET_STACK_EXPORT
     void datalink_cleanup(
         void);
+
     BACNET_STACK_EXPORT
     void datalink_get_broadcast_address(
         BACNET_ADDRESS * dest);
+
     BACNET_STACK_EXPORT
     void datalink_get_my_address(
         BACNET_ADDRESS * my_address);
+
     BACNET_STACK_EXPORT
     void datalink_set_interface(
         char *ifname);
+
     BACNET_STACK_EXPORT
     void datalink_set(
         char *datalink_string);
 
+    BACNET_STACK_EXPORT
+    void datalink_maintenance_timer(uint16_t seconds);
+
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */
@@ -149,9 +159,11 @@ extern "C" {
  * - BACDL_ETHERNET -- for Clause 7 ISO 8802-3 ("Ethernet") LAN
  * - BACDL_ARCNET   -- for Clause 8 ARCNET LAN
  * - BACDL_MSTP     -- for Clause 9 MASTER-SLAVE/TOKEN PASSING (MS/TP) LAN
- * - BACDL_BIP      -- for ANNEX J - BACnet/IP
+ * - BACDL_BIP      -- for ANNEX J - BACnet/IPv4
+ * - BACDL_BIP6     -- for ANNEX U - BACnet/IPv6
  * - BACDL_ALL      -- Unspecified for the build, so the transport can be
  *                     chosen at runtime from among these choices.
+ * - BACDL_NONE      -- Unspecified for the build for unit testing
  * - Clause 10 POINT-TO-POINT (PTP) and Clause 11 EIA/CEA-709.1 ("LonTalk") LAN
  *   are not currently supported by this project.
                                                                                                                                                                                               *//** @defgroup DLTemplates DataLink Template Functions