[VOL-3600] Increase robustness of mib upload process
New: Fix traffic issue with SERCOM ONU

Signed-off-by: Holger Hildebrandt <holger.hildebrandt@adtran.com>
Change-Id: I479e058b080b7e00f803efb95b5322cea9994a29
diff --git a/internal/pkg/onuadaptercore/onu_device_entry.go b/internal/pkg/onuadaptercore/onu_device_entry.go
index 90ba235..27c0865 100644
--- a/internal/pkg/onuadaptercore/onu_device_entry.go
+++ b/internal/pkg/onuadaptercore/onu_device_entry.go
@@ -190,6 +190,9 @@
 const onugSerialNumberLen = 8
 const omciMacAddressLen = 6
 
+const cEmptyMacAddrString = "000000000000"
+const cEmptySerialNumberString = "0000000000000000"
+
 type swImages struct {
 	version  string
 	isActive uint8