avinash chaurasia wrote:
>
>
> hi all,
> Does tcp packet in wireless have data in payload as whenever i tried to
> print it using
> if((PacketData*)p->userdata()!
> =NULL) {
> PacketData* packdata = (PacketData*)p->userdata();
> unsigned char* pdata = (unsigned char*)packdata->data();
> printf("data = %s and p data = %d ",pdata, pdata);
> }
>
> it shows some awkward result(unreadable format) with %s and blank with %c
> but have some random numbers with %d, while datalen() returns 10 but
> strlen(pdata) returns 1 . Can i think number returned by %d is real
> payload? if no please let me know how to write payload on trace files.
>
>
> Thanks
> Avinash Kumar Chaurasia
> Department of Computer Science
> IIT Kanpur, India
>
>
userdata() is a Packet class method.
It's not a TCP feature in ns2.
Which TCL file did you run in your test ?
Do you have to use TCP at the transport layer ?
There is MessagePassingAgent class in messpass.h and messpass.cc in the
common directory.
Look at tcl/ex/wireless-flooding.tcl for a nice example to carry ascii text
in a simulation.
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