Added check to prevent BACnet/IP messages from myself.

bacnet-stack/ports/linux/bip.c

@@ -276,7 +276,13 @@ uint16_t bip_receive(
     /* Original-Broadcast-NPDU or Original-Unicast-NPDU */
     if ((buf[1] == 0x0B) || (buf[1] == 0x0A))
     {
-        // copy the source address
+        /* ignore messages from me */
+        if (sin.sin_addr.s_addr == BIP_Address.s_addr)
+            pdu_len = 0;
+        else
+        {
+            /* copy the source address
+              FIXME: IPv6? */
             src->mac_len = 6;
             (void)encode_unsigned32(&src->mac[0],
                 sin.sin_addr.s_addr);
@@ -284,6 +290,7 @@ uint16_t bip_receive(
                 sin.sin_port);
             // FIXME: check destination address
             // see if it is broadcast or for us
+    
             /* decode the length of the PDU - length is inclusive of BVLC */
             (void)decode_unsigned16(&buf[2],&pdu_len);
             /* copy the buffer into the PDU */
@@ -293,6 +300,7 @@ uint16_t bip_receive(
             else
                 pdu_len = 0;
         }
+    }
 
     return pdu_len;
 }