wifi: (fixes #480) Call ReportDataFailed only for failed non-group Data frames

As a result of an internal collision, the transmission of any type
of frame may fail (in the bug report, it was a Beacon frame)

RELEASE_NOTES.md

@@ -32,6 +32,7 @@ Bugs fixed
 - (wifi) #467 - WiFi: Failed association process
 - (wifi) #468 - WiFi: Wrong txDuration for trigger frame
 - (wifi) #475 - Wi-Fi: Assert when sending OFDMA DL to STAs with different TIDs
+- (wifi) #480 - wifi: 2.4GHz remote station manager issue 
 
 Release 3.35
 ============

src/wifi/model/frame-exchange-manager.cc

@@ -856,7 +856,11 @@ FrameExchangeManager::NotifyInternalCollision (Ptr<Txop> txop)
 
   if (mpdu != nullptr)
     {
-      m_mac->GetWifiRemoteStationManager ()->ReportDataFailed (mpdu);
+      if (mpdu->GetHeader ().HasData ()
+          && !mpdu->GetHeader ().GetAddr1 ().IsGroup ())
+        {
+          m_mac->GetWifiRemoteStationManager ()->ReportDataFailed (mpdu);
+        }
 
       if (!mpdu->GetHeader ().GetAddr1 ().IsGroup ()
           && !m_mac->GetWifiRemoteStationManager ()->NeedRetransmission (mpdu))