Broadcast is not forwarded twice into the same channel

src/devices/mesh/dot11s/hwmp-mac-plugin.cc

@@ -309,9 +309,14 @@ HwmpMacPlugin::SendPerr(IePerr perr, std::vector<Mac48Address> receivers)
   SendOnePerr ();
 }
 uint32_t
-HwmpMacPlugin::GetLinkMetric(Mac48Address peerAddress)
+HwmpMacPlugin::GetLinkMetric(Mac48Address peerAddress) const
 {
   return m_parent->GetLinkMetric(peerAddress);
 }
+uint16_t
+HwmpMacPlugin::GetChannelId () const
+{
+  return m_parent->GetFrequencyChannel ();
+}
 } //namespace dot11s
 }//namespace ns3

src/devices/mesh/dot11s/hwmp-mac-plugin.h

@@ -69,9 +69,10 @@ private:
   /// Sends one PREQ when PreqMinInterval after last PREQ expires (if any PREQ exists in rhe queue)
   void SendOnePreq ();
   void SendOnePerr ();
-  /// Returns metric to HWMP protocol, needed only by metrics to add
+  /// \return metric to HWMP protocol, needed only by metrics to add
   //peer as routing entry
-  uint32_t GetLinkMetric (Mac48Address peerAddress);
+  uint32_t GetLinkMetric (Mac48Address peerAddress) const;
+  uint16_t GetChannelId () const;
 private:
   Ptr<MeshWifiInterfaceMac> m_parent;
   uint32_t m_ifIndex;

src/devices/mesh/dot11s/hwmp-protocol.cc

@@ -209,8 +209,17 @@ HwmpProtocol::RequestRoute (
   }
   if (destination == Mac48Address::GetBroadcast ())
   {
+    //channel IDs where we have already sent broadcast:
+    std::vector<uint16_t> channels;
     for(HwmpPluginMap::const_iterator plugin = m_interfaces.begin (); plugin != m_interfaces.end (); plugin ++)
     {
+      bool should_send = true;
+      for(std::vector<uint16_t>::const_iterator chan = channels.begin(); chan != channels.end(); chan ++)
+        if(*chan == plugin->second->GetChannelId ())
+          should_send = false;
+      if(!should_send)
+        continue;
+      channels.push_back(plugin->second->GetChannelId ());
       std::vector<Mac48Address> receivers = GetBroadcastReceivers (plugin->first);
       for (std::vector<Mac48Address>::const_iterator i = receivers.begin (); i != receivers.end(); i ++)
       {

src/devices/mesh/mesh-wifi-interface-mac.cc

@@ -27,7 +27,6 @@
 #include "ns3/mac-rx-middle.h"
 #include "ns3/mac-low.h"
 #include "ns3/dca-txop.h"
-//#include "ns3/mesh-wifi-mac-header.h"
 #include "ns3/random-variable.h"
 #include "ns3/simulator.h"
 #include "ns3/yans-wifi-phy.h"