RP and RPM Network Port indefinite object instance (#146)

* RP and RPM Network Port indefinite object instance

Added ReadProperty and ReadPropertyMultiple handling for
Network Port object indefinite object instance 4194303.

* Add network port object to some examples

* Fix stm32f10x build

* Fix Endian order of network port IP UDP port

* Add network port object to BDK Makefile

* Add network port object header to BDK device.c

* fix BDK and AT91SAM7S port builds

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

ports/at91sam7s/dlmstp.c

@@ -1396,3 +1396,13 @@ void dlmstp_get_broadcast_address(BACNET_ADDRESS *dest)
 
     return;
 }
+
+uint8_t dlmstp_max_info_frames_limit(void)
+{
+    return MSTP_PDU_PACKET_COUNT;
+}
+
+uint8_t dlmstp_max_master_limit(void)
+{
+    return 127;
+}