Packets in WifiMacQueue

[ee16...@smail.iitm.ac.in]

Hello ns3 users,

Can anyone help me to find how many packets are standing in WifiMacQueue? I am trying following code but zero(0) packets are showing every time.

static void GetMacQueue_pkts(NetDeviceContainer wifiapDevice)

{

PointerValue ptr;

wifiapDevice.Get(0)->GetAttribute ("Mac",ptr); // get the attribute Mac and store in ptr

Ptr<ApWifiMac> mac1 = ptr.Get<ApWifiMac> ();

mac1->GetAttribute ("DcaTxop",ptr);

Ptr<DcaTxop> dca = ptr.Get<DcaTxop> ();

Ptr<WifiMacQueue> mac_queue = dca->GetQueue ();

//Ptr<EdcaTxopN> edca = ptr.Get<EdcaTxopN> ();

//Ptr<WifiMacQueue> mac_queue = edca->GetQueue ();

uint32_t pkts_mq = mac_queue->GetNPackets();

std::cout << "packets in mac queue" << " : " << pkts_mq << std::endl;

Simulator::Schedule (Seconds(0.5), &GetMacQueue_pkts, wifiapDevice);

}

I am currently using ns3.27. Thanks in advance!!