Re: [Discuss-gnuradio] Text transmission using usrp

[CEL]

Yes! As you can see, the whole chain takes PDUs.

You can generate PDUs from tagged streams using the appropriately named
block.

You can convert a normal stream to a tagged stream using the
appropriately named block!

A normal stream is what a file source produces. This is the one case
where a throttle within a hardware-limited flow graph makes sense:
Throttle the output of your file source to a reasonable byte rate,
connect it to the tagged stream converter, that to the pdu converter.

Best regards,
Marcus

On Thu, 2018-06-28 at 12:31 +0200, Trueblues 17 wrote:
> Is there a way to use packet_loopback_hier.grc to send a text file in other 
> words is it possible to packetize a text file and use it?
> On Wed, Jun 27, 2018, 11:49 AM Müller, Marcus (CEL) <address@hidden> wrote:
> > Hi Trueblues,
> > 
> > the packet encoder and decoder blocks are known to be broken – that's
> > why they are in the "deprecated" category! It'll be gone with the next
> > minor release of GNU Radio, even. (same will happen to WX GUI, so
> > switch to Qt now!)
> > 
> > So, please don't use them; I don't expect them to work.
> > Instead, you'll find, within the examples that came with GNU Radio¹ the
> > digital/packet/packet_rx.grc and digital/packet/packet_tx.grc examples.
> > 
> > These I expect to work. They are hierarchical blocks, which you can
> > generate and through reloading of the block library also find in GRC's
> > block library.
> > 
> > in digital/packet_loopback_hier.grc you'll find a fully fledged
> > transceiver – that has all the bells and whistles of a minimal
> > communication system, including error correction, and phase and clock
> > corrections. Much, much better than "packet decoder" ever has been.
> > 
> > As soon as you have a rough idea what happens in the loopback flow
> > graph, replace the "Channel Model" with your pair of USRP sink and
> > source, and try it over the air :)
> > 
> > As we're trying to stay atop of documentation, can I ask you how you
> > came to build your flow graph with the packet en- and decoder? Is it
> > completely a design of our own, or is there resources within our sphere
> > of influence that we might clean up?
> > 
> > Best regards,
> > Marcus
> > 
> > ¹typically /usr/[local/]share/gnuradio/examples
> > 
> > On Wed, 2018-06-27 at 02:54 +0200, Trueblues 17 wrote:
> > > I'm having a problem sending a text file between two usrp 2922
> > > devices. I'm running gnuradio companion on both laptops on windows.
> > > The FFT sink in the receiver detects an incoming signal however the
> > > file sink size is 0 byte.I attached both tx and rx flow graphs i
> > > used. I previously implemented an FM transceiver without any problems
> > > but when it comes to text, image and video i can't get an output 
> > > _______________________________________________
> > > Discuss-gnuradio mailing list
> > > address@hidden
> > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

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