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

From: CEL
Subject: Re: [Discuss-gnuradio] Packet decoder does not output the last packet
Date: Mon, 12 Nov 2018 12:16:31 +0000

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
and the detailed packet_rx.grc and packet_tx.grc.

Best regards,

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
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> Discuss-gnuradio mailing list
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