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Bastian Bloessl
2013-06-26 14:53:09 +02:00
parent 7e99acd5d7
commit cb38216300
1 changed files with 32 additions and 22 deletions
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README.txt
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____ \
____ ______ / __/___ ____ \ \
/ __ `/ ___/_____/ /_/ __ \/ __ \ \ | |
/ /_/ / / /_____/ __/ /_/ / /_/ / / | |
\__, /_/ /_/ \____/\____/ / /
/____/ /
Hi!
This is a collection of custom blocks that are not directly associated with a
special project. For sample applications see:
project. For sample applications see:
https://github.com/bastibl/gr-ieee802-11
https://github.com/bastibl/gr-ieee802-15-4
@@ -10,19 +18,20 @@ https://github.com/bastibl/gr-ieee802-15-4
### Wireshark Connector
This blocks outputs PDUs in the PCAP format. The resulting file can be opened in
nearly all network monitoring applications. Some examples are Wireshark, Tshark,
and tcpdump. Currently, it support WiFi packets with radiotap header and ZigBee.
This blocks outputs PDUs in the PCAP format which is supported by all common
network monitoring applications. Some examples are Wireshark, Tshark, and
tcpdump. Currently, it supports WiFi packets with Radiotap header and ZigBee.
Since GNU Radio does not support File Sinks that append to a file, one can not
open Linux pipes / fifos. For that reason, it is not easily possible to monitor
traffic live. However, loading the file in Wireshark works.
Since GNU Radio File Sinks have hard-coded open flags that include O_TRUNC one
can not open Linux pipes. For that reason, it is not possible to monitor traffic
live by connection Wireshark to a pipe. However, opening the file and
investigating the traffic offline works fine.
I made a patch that adds an append option to the File Sink. If you are
interested see:
https://github.com/bastibl/gnuradio/commit/befa5bd94b59a56e13d7ec4fe0da86637fe624d9
I made a patch that adds an append option to the File Sink. With this patch you
can also open pipes. If you are interested see:
https://github.com/bastibl/gnuradio/
For further information about radiotap, pcap, and Wireshark see:
For further information about Radiotap, PCAP, and Wireshark see:
http://www.radiotap.org/
http://www.wireshark.org/
@@ -30,9 +39,10 @@ http://www.wireshark.org/
### Burst Tagger
Tags a burst / packet with tx_sob und tx_eob tags. This is useful if the SDR is
operating in half duplex mode. With adding a tx_eob the USRP switches back to
receive mode immediately. That way, direct responses like ACKs are not missed.
Tags a burst / packet / bunch of samples with tx_sob und tx_eob tags. This is
useful if the SDR is operating in half-duplex mode. With adding a tx_eob the
USRP switches back to receive mode immediately. That way, direct responses like
ACKs are not missed.
The block searches for a special tag that indicates the start of a burst. The
name of this tag is configurable. The tag should indicate the length of the
@@ -51,19 +61,19 @@ like ACKs, retransmission and stuff.
### Packet Pad
Adds a configurable number of zeros before and after a burst. The burst has to
be started with an tx_sob, and ended with a tx_eob tag.
From time to time I had issues when I did not pad the sample stream. This block
helps to investigate that.
Also it is handy for loopback testing when there is no continues sample stream.
be started with an tx_sob, and ended with a tx_eob tag. From time to time I had
issues when I did not pad the sample stream. This block helps to investigate
that. It is also handy for loopback testing when there is no continues sample
stream.
### Periodic Msg Source
This block sends messages at regular intervals much like the message strobe block in
mainline GNU Radio. With this block you can in addition configure the number of
packets that are sent. When all normal messages are sent, the blocks sends a final
PMT_EOF message to indicate that it is done.
This block sends messages at regular intervals much like the Message Strobe
block in mainline GNU Radio. With this block you can also configure the number
of packets that are sent. When all normal messages are sent, the blocks sends a
final PMT_EOF message to indicate that it is done.
I used this block for automated performance tests with no-GUI flow graphs.