modified the BACnet/IP init code for the win32 platform to make it work on my system. It seems that something else is intercepting the packets when the bind was set to INADDR_ANY, so I just bind to the host default adapter.

bacnet-stack/ports/linux/bip-init.c

@@ -123,7 +123,7 @@ bool bip_init(void)
     sin.sin_family = AF_INET;
     sin.sin_addr.s_addr = htonl(INADDR_ANY);
     sin.sin_port = htons(bip_get_port());
-    memset(&(sin.sin_zero), '\0', 8);
+    memset(&(sin.sin_zero), '\0', sizeof(sin.sin_zero));
     status = bind(sock_fd,
         (const struct sockaddr*)&sin, sizeof(struct sockaddr));
     if (status < 0)

bacnet-stack/ports/win32/bacnet/bacnet.dsp

@@ -67,7 +67,7 @@ LINK32=link.exe
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
 # ADD BASE CPP /nologo /W3 /Gm /GX /ZI /Od /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ /c
-# ADD CPP /nologo /W3 /Gm /GX /ZI /Od /I "c:\code\bacnet-stack\\" /I "c:\code\bacnet-stack\ports\win32\\" /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /D "BACDL_BIP" /FD /GZ /c
+# ADD CPP /nologo /W3 /Gm /GX /ZI /Od /I "c:\code\bacnet-stack\\" /I "c:\code\bacnet-stack\ports\win32\\" /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /D "BACDL_BIP" /FR /FD /GZ /c
 # SUBTRACT CPP /YX
 # ADD BASE RSC /l 0x409 /d "_DEBUG"
 # ADD RSC /l 0x409 /d "_DEBUG"
@@ -125,11 +125,19 @@ SOURCE=..\..\..\bacfile.c
 # End Source File
 # Begin Source File
 
+SOURCE=..\..\..\bactext.c
+# End Source File
+# Begin Source File
+
 SOURCE=..\..\..\bigend.c
 # End Source File
 # Begin Source File
 
-SOURCE=..\bip.c
+SOURCE="..\bip-init.c"
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\bip.c
 # End Source File
 # Begin Source File
 
@@ -153,6 +161,10 @@ SOURCE=..\..\..\iam.c
 # End Source File
 # Begin Source File
 
+SOURCE=..\..\..\indtext.c
+# End Source File
+# Begin Source File
+
 SOURCE=..\main.c
 # End Source File
 # Begin Source File

bacnet-stack/ports/win32/bip-init.c

@@ -80,6 +80,11 @@ static void set_broadcast_address(uint32_t net_address)
   #endif
 }
 
+static void cleanup(void)
+{
+  WSACleanup();
+}
+
 bool bip_init(void)
 {
     int rv = 0; // return from socket lib calls
@@ -92,7 +97,6 @@ bool bip_init(void)
     struct in_addr address;
 
     Result = WSAStartup(MAKEWORD(2,2), &wd);
-
     if (Result != 0)
     {
       Code = WSAGetLastError();
@@ -100,6 +104,8 @@ bool bip_init(void)
         Code);
       exit(1);
     }
+    atexit(cleanup);
+
     address.s_addr = gethostaddr();
     if (address.s_addr == (unsigned)-1)
     {
@@ -116,7 +122,7 @@ bool bip_init(void)
     sock_fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
     bip_set_socket(sock_fd);
     if (sock_fd < 0)
-        return false;
+      return false;
 
     // Allow us to use the same socket for sending and receiving
     // This makes sure that the src port is correct when sending
@@ -124,25 +130,44 @@ bool bip_init(void)
         (char *)&value, sizeof(value));
     if (rv < 0)
     {
-        close(sock_fd);
+      close(sock_fd);
-        bip_set_socket(-1);
+      bip_set_socket(-1);
-        return false;
+      return false;
     }
     // allow us to send a broadcast
     rv = setsockopt(sock_fd, SOL_SOCKET, SO_BROADCAST,
-        (char *)&value, sizeof(value));
+      (char *)&value, sizeof(value));
     if (rv < 0)
     {
-        close(sock_fd);
+      close(sock_fd);
-        bip_set_socket(-1);
+      bip_set_socket(-1);
-        return false;
+      return false;
     }
 
     // bind the socket to the local port number and IP address
     sin.sin_family = AF_INET;
-    sin.sin_addr.s_addr = htonl(INADDR_ANY);
+    /* by setting sin.sin_addr.s_addr to INADDR_ANY,
+       I am telling the IP stack to automatically fill
+       in the IP address of the machine the process
+       is running on.
+
+       Some server computers have multiple IP addresses.
+       A socket bound to one of these will not accept
+       connections to another address. Frequently you prefer
+       to allow any one of the computer's IP addresses
+       to be used for connections.  Use INADDR_ANY (0L) to
+       allow clients to connect using any one of the host's
+       IP addresses.
+
+       Note: sometimes INADDR_ANY does not let me get
+       any unicast messages.  Not sure why...
+       */
+    /* sin.sin_addr.s_addr = htonl(INADDR_ANY); */
+    /* or we could use the specific adapter address
+       note: already in network byte order */
+    sin.sin_addr.s_addr = address.s_addr;
     sin.sin_port = htons(bip_get_port());
-    memset(&(sin.sin_zero), '\0', 8);
+    memset(&(sin.sin_zero), '\0', sizeof(sin.sin_zero));
     rv = bind(sock_fd,
         (const struct sockaddr*)&sin, sizeof(struct sockaddr));
     if (rv < 0)

bacnet-stack/ports/win32/main.c

@@ -29,6 +29,7 @@
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
+#include <conio.h> /* for kbhit and getch */
 #include "iam.h"
 #include "address.h"
 #include "config.h"
@@ -183,6 +184,30 @@ static void print_address(
   }
 }
 
+static void print_address_cache(void)
+{
+  unsigned i,j;
+  BACNET_ADDRESS address;
+  uint32_t device_id = 0;
+  unsigned max_apdu = 0;
+
+  fprintf(stderr,"Device\tMAC\tMaxAPDU\tNet\n");
+  for (i = 0; i < MAX_ADDRESS_CACHE; i++)
+  {
+    if (address_get_by_index(i,&device_id, &max_apdu, &address))
+    {
+      fprintf(stderr,"%u\t",device_id);
+      for (j = 0; j < address.mac_len; j++)
+      {
+        fprintf(stderr,"%02X",address.mac[j]);
+      }
+      fprintf(stderr,"\t");
+      fprintf(stderr,"%hu\t",max_apdu);
+      fprintf(stderr,"%hu\n",address.net);
+    }
+  }
+}
+
 int main(int argc, char *argv[])
 {
   BACNET_ADDRESS src = {0};  // address where message came from
@@ -243,5 +268,13 @@ int main(int argc, char *argv[])
     // output
 
     // blink LEDs, Turn on or off outputs, etc
+
+    /* wait for ESC from keyboard before quitting */
+    if (kbhit() && (getch() == 0x1B))
+      break;
   }
+
+  print_address_cache();
+
+  return 0;
 }