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