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update readme to cover delay feature of packet pad

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Bastian Bloessl
2013-12-06 18:29:28 +01:00
parent 9c36b42e85
commit bc35c36eae
1 changed files with 14 additions and 19 deletions
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README.txt
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@@ -22,21 +22,26 @@ 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 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. 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:
http://www.radiotap.org/
http://www.wireshark.org/
### 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. It is also handy for loopback testing when there is no continues sample
stream. Furthermore, this block can add a tx_time tag to every burst that lies
a configurable number of seconds in the future. This is handy to buffer the
sample stream for a short time to avoid underruns during the transmission,
which lead to corrupted signals. You have to set the sync option to 'PC source'
for this feature.
### Burst Tagger
Tags a burst / packet / bunch of samples with tx_sob und tx_eob tags. This is
@@ -58,16 +63,6 @@ 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. 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