Re: reading SeqTsHeader timestamp at MacRxCallback

[Nuwan Dank]

Hi Khurshid 

I have a feeling you sent this to the wrong group. 

On Thu, Aug 16, 2018 at 9:22 AM, Khurshid Alam <khursh...@gmail.com> wrote:

Hello everyone,

I am trying to insert the SeqTsHeader in the packet and access it at MacRx interface

When I remove the SeqTsHeader from the packet the time value is not correct but we can see the correct time value there in the packet.

following is my part of codes

.....create packet

  Ptr<Packet> packet = Create<Packet> (m_pktSize);

  SeqTsHeader hdr = SeqTsHeader(); 

  packet->AddHeader(hdr);

.....

Config::Connect ("/NodeList/*/DeviceList/*/$ns3::WifiNetDevice/Mac/$ns3::WifiMac/MacRx", MakeCallback (&MacRxCallback));

....

void MacRxCallback (std::string context, Ptr<const Packet> p)

{

...

  Ptr<Packet> pcopy = p->Copy();

  SeqTsHeader tsHdr;

  pcopy->RemoveHeader (tsHdr);

  

  Time ts = tsHdr.GetTs().GetNanoSeconds();

  NS_LOG_UNCOND (tsHdr << "\t" << "ts: "<< ts);

...

}

Output:

=====================MacRxCallback()=====================

simulator time: +10997468000.0ns

ns3::LlcSnapHeader (type 0x800) ns3::Ipv4Header (tos 0x0 DSCP Default ECN Not-ECT ttl 64 id 9987 protocol 17 offset (bytes) 0 flags [none] length: 140 10.1.1.2 > 10.1.1.5) ns3::UdpHeader (length: 120 49153 > 10) ns3::SeqTsHeader ((seq=0 time=10.997)) Payload (size=100)

(seq=3221291018 time=3.3777e+07) ts: +33776997205278720.0ns

/NodeList/4/DeviceList/0/$ns3::WifiNetDevice/Mac/$ns3::WifiMac/MacRx

in the packet SeqTsHeader contains correct time 10.997s but when I remove the header the seq number and time both changed with the constant value for all MacRx. 

can it be because I am removing the header at Mac? 

I appreciate your help 

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Nuwan Dank

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[Khurshid Alam]

Hi Nuwan,

I am sorry, it was supposed to be posted in ns3-user-group.

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Nuwan Dank

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"Pick up something when you fall" 

This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. If you are not the intended recipient you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited.