Re: [Discuss-gnuradio] Packet decoder does not output the last packet

Dear Marcus,

Thank you for your advice. A colleague and I tried working with those examples and found the receiver block only produced zeros in simulation. Google led us to this unanswered post: https://lists.gnu.org/archive/html/discuss-gnuradio/2017-03/msg00211.html We were faced with a demonstration deadline and resorted to the packet encoder.

For me, this is a completely new and interesting area of study. I am grateful for the gnuradio community and will return to the examples you have suggested.

Best regards,

Diane

Diane Williams
Senior Professional Research Assistant, Electrical Engineering
University of Colorado Denver

Dear Ms. Williams,

I'm sorry you fell into that trap, but:

Packet Encoder/Decoder is known to be buggy. That's why it's in the
"deprecated" category. Simply don't use them.

You'll find a better example in the GNU Radio examples that were
shipped in /usr/share/gnuradio/examples/digital, specifically in
/usr/share/gnuradio/examples/digital/packet/packet_loopback_hier.grc
and the detailed packet_rx.grc and packet_tx.grc.

Best regards,
Marcus

On Sun, 2018-11-11 at 17:44 +0000, Williams, Diane wrote:
> In a very gnuradio simple simulation, flowgraph shown in attached image simple_udp_simulation, all packets sent to the UDP source are received by the UDP sink and sent out to a connected UDP socket server program.
>
> When adding the other processing blocks to the simulation, attached image udp_packet_encoder_gmsk_simulation, the last packet is received by the UDP source, but not by the UDP sink. That last packet never is output by the packet decoder. If I send one extra packet through, a dummy packet of the same length, then I get my last valid packet. I can do this and handle it in post-processing, if needed, when later that dummy packet, flows through, but I would appreciate knowing why the packet decoder hangs onto the last packet.
>
> I see the packet encoder/decoder deprecation warnings, but have not yet found a working example for other means of encoding and decoding.
>
> I am using Ubuntu 18.04 gnuradio packages 3.7.11
>
> Thank you.
>
>
>
> Diane Williams
> Senior Professional Research Assistant, Electrical Engineering
> University of Colorado Denver
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

From:	Williams, Diane
Subject:	Re: [Discuss-gnuradio] Packet decoder does not output the last packet
Date:	Mon, 12 Nov 2018 17:51:02 +0000