Re: [Discuss-gnuradio] file source with gr-ieee802.11 tx

[Jason Matusiak]

> The wifi_tx example GRC comes with a Socket PDU source.

> Just send UDP packets to the port specified containing a IEEE 802.11 packet's 
> amount of data per UDP packet; 
> netcat/nc/ncat is sadly no good for this, because it doesn't allow 
> specification of packet sizes.

> You can also use a file source, stream to tagged stream, tagged stream to PDU 
> flow graph.

> To be honest, GNU Radio is kind of lacking a simple "take n items from the 
> input stream and generate a PMT pair 
> (n, items), send that over your message port" block, which would take roughly 
> 10 lines of python to write (and 
> not much more C++) -- so you might as well do that. 

This is something I have struggled with as well.  A lot of examples I've
seen are for streaming data (which is admittedly probably want most
people are wanting).  

I have been more interested in sending a packet (or a series of packets)
over the air (the end goal being letting someone connect to my UDP
source block and handing me their data they want to send).  I have
played with the WiFi block a bit recently and unfortunately was always
using netcat....  

1 - Are you saying that the data's packet being handed to the socket PDU
has to be exactly as long as the pdu_length?  That is something I think
I must have glossed over.

2 - I don't believe there is a way to dump just the payload of the
802.11 packet, right?  Basically, if I sent "Hello World" to the Socket
PDU (which means my pdu_length would need to be set to 11, right?), is
there a way to have those 11 characters be passed out a UDP sink on the
receiver end?  Right now the only thing I can see to do is to utilize
the Wireshark Connector and dump the pcap output to file, then take info
and extract the payload from there in post-processing.  Is that right?

Thanks.