I wouldn't change the packet size on the udp sink - it wasn't 16 in the
simulation - and even if it was I wouldn't mess with the defaults settings.
Also you have a plumbing problem between packet encoder and gmk mod -
the samples/symbol should be equal.
And I wouldn't use the packet encoded - I would just use a steam to
tagged stream block.
On the low pass filter, I would set it to "Bypass" - fiddle with LPF
later if needed.
And last but not least, I would recommend using the zmq sources and
sinks instead of the udp sources and sinks - I think they're easier.
If you do decided to use zmq, just use the default protocol - namely,
tcp until you're comfortable using it.
See
http://zeromq.org/docs:features
I don't know anything about your source, but enclosed is the way I would
do it based on my biases and prejudices - using a random GFLSR source
instead.
In the end, I compare the input of the source to the output of the gmsk
demod.
-- Cinaed
On 11/11/2018 09:44 AM, 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
> Discuss-gnuradio@gnu.org
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
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<param>
<key>width9</key>
<value>1</value>
</param>
<param>
<key>name</key>
<value>""</value>
</param>
<param>
<key>nconnections</key>
<value>2</value>
</param>
<param>
<key>size</key>
<value>1024</value>
</param>
<param>
<key>srate</key>
<value>samp_rate</value>
</param>
<param>
<key>stemplot</key>
<value>False</value>
</param>
<param>
<key>tr_chan</key>
<value>0</value>
</param>
<param>
<key>tr_delay</key>
<value>0</value>
</param>
<param>
<key>tr_level</key>
<value>0.0</value>
</param>
<param>
<key>tr_mode</key>
<value>qtgui.TRIG_MODE_FREE</value>
</param>
<param>
<key>tr_slope</key>
<value>qtgui.TRIG_SLOPE_POS</value>
</param>
<param>
<key>tr_tag</key>
<value>""</value>
</param>
<param>
<key>type</key>
<value>float</value>
</param>
<param>
<key>update_time</key>
<value>0.10</value>
</param>
<param>
<key>ylabel</key>
<value>Amplitude</value>
</param>
<param>
<key>yunit</key>
<value>""</value>
</param>
<param>
<key>ymax</key>
<value>2</value>
</param>
<param>
<key>ymin</key>
<value>-1</value>
</param>
</block>
<block>
<key>zeromq_pull_source</key>
<param>
<key>address</key>
<value>tcp://127.0.0.1:5556</value>
</param>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>1</value>
</param>
<param>
<key>_coordinate</key>
<value>(160, 236)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>hwm</key>
<value>-1</value>
</param>
<param>
<key>id</key>
<value>zeromq_pull_source_0</value>
</param>
<param>
<key>type</key>
<value>byte</value>
</param>
<param>
<key>maxoutbuf</key>
<value>0</value>
</param>
<param>
<key>minoutbuf</key>
<value>0</value>
</param>
<param>
<key>pass_tags</key>
<value>True</value>
</param>
<param>
<key>timeout</key>
<value>100</value>
</param>
<param>
<key>vlen</key>
<value>1</value>
</param>
</block>
<block>
<key>zeromq_push_sink</key>
<param>
<key>address</key>
<value>tcp://127.0.0.1:5556</value>
</param>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>1</value>
</param>
<param>
<key>_coordinate</key>
<value>(784, 116)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>hwm</key>
<value>-1</value>
</param>
<param>
<key>id</key>
<value>zeromq_push_sink_0</value>
</param>
<param>
<key>type</key>
<value>byte</value>
</param>
<param>
<key>pass_tags</key>
<value>True</value>
</param>
<param>
<key>timeout</key>
<value>100</value>
</param>
<param>
<key>vlen</key>
<value>1</value>
</param>
</block>
<connection>
<source_block_id>blocks_char_to_float_0_0_0</source_block_id>
<sink_block_id>qtgui_time_sink_x_0_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>blocks_char_to_float_0_0_0_0</source_block_id>
<sink_block_id>qtgui_time_sink_x_0_0</sink_block_id>
<source_key>0</source_key>
<sink_key>1</sink_key>
</connection>
<connection>
<source_block_id>blocks_delay_0</source_block_id>
<sink_block_id>blocks_char_to_float_0_0_0_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>blocks_float_to_uchar_0</source_block_id>
<sink_block_id>blocks_stream_to_tagged_stream_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>blocks_float_to_uchar_0</source_block_id>
<sink_block_id>blocks_unpack_k_bits_bb_0_0_0_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>blocks_stream_to_tagged_stream_0</source_block_id>
<sink_block_id>zeromq_push_sink_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>blocks_unpack_k_bits_bb_0</source_block_id>
<sink_block_id>blocks_char_to_float_0_0_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>blocks_unpack_k_bits_bb_0_0_0_0</source_block_id>
<sink_block_id>blocks_delay_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>digital_glfsr_source_x_0_0</source_block_id>
<sink_block_id>blocks_float_to_uchar_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>digital_gmsk_demod_0</source_block_id>
<sink_block_id>blocks_unpack_k_bits_bb_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>digital_gmsk_mod_0_0</source_block_id>
<sink_block_id>digital_gmsk_demod_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>zeromq_pull_source_0</source_block_id>
<sink_block_id>digital_gmsk_mod_0_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
</flow_graph>
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