Bastian Bloessl
86 lines
2.5 KiB
Plaintext
86 lines
2.5 KiB
Plaintext
Hi!
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This is a collection of custom blocks that are not directly associated with a
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special project. For sample applications see:
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https://github.com/bastibl/gr-ieee802-11
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https://github.com/bastibl/gr-ieee802-15-4
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### Wireshark Connector
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This blocks outputs PDUs in the PCAP format. The resulting file can be opened in
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nearly all network monitoring applications. Some examples are Wireshark, Tshark,
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and tcpdump. Currently, it support WiFi packets with radiotap header and ZigBee.
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Since GNU Radio does not support File Sinks that append to a file, one can not
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open Linux pipes / fifos. For that reason, it is not easily possible to monitor
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traffic live. However, loading the file in Wireshark works.
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I made a patch that adds an append option to the File Sink. If you are
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interested see:
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https://github.com/bastibl/gnuradio/commit/befa5bd94b59a56e13d7ec4fe0da86637fe624d9
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For further information about radiotap, pcap, and Wireshark see:
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http://www.radiotap.org/
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http://www.wireshark.org/
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### Burst Tagger
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Tags a burst / packet with tx_sob und tx_eob tags. This is useful if the SDR is
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operating in half duplex mode. With adding a tx_eob the USRP switches back to
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receive mode immediately. That way, direct responses like ACKs are not missed.
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The block searches for a special tag that indicates the start of a burst. The
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name of this tag is configurable. The tag should indicate the length of the
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packet in samples. Also a multiplier can be specified, which multiples the
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length given in the tag.
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### Packet Dropper
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Drops a configurable percentage of messages. I used it to test protocol logic
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like ACKs, retransmission and stuff.
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### Packet Pad
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Adds a configurable number of zeros before and after a burst. The burst has to
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be started with an tx_sob, and ended with a tx_eob tag.
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From time to time I had issues when I did not pad the sample stream. This block
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helps to investigate that.
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Also it is handy for loopback testing when there is no continues sample stream.
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### Periodic Msg Source
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This block sends messages at regular intervals much like the message strobe block in
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mainline GNU Radio. With this block you can in addition configure the number of
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packets that are sent. When all normal messages are sent, the blocks sends a final
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PMT_EOF message to indicate that it is done.
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I used this block for automated performance tests with no-GUI flow graphs.
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### Dependencies
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GNU Radio v3.7
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### Installation
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git clone https://github.com/bastibl/gr-foo.git
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cd gr-foo
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mkdir build
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cd build
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cmake ..
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make
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sudo make install
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sudo ldconfig
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