March 2012 - Ibr-dtn - lists.ibr.cs.tu-bs.de

IBR-DTN and SDNV
by Carson Dunbar 28 Mar '12

28 Mar '12

Hey Johannes, I am still working on the network-coding router for IBR-DTN and had another issue. I figured out what you were talking about in regards to block processors and how to create new extension blocks, but I had a question regarding the SDNV. In the DTN2 implementation of EBR (a network coding router) they used SDNV to encode their data when streaming it into blocks so that they met the draft spec. The only example I see of that in IBR-DTN is in AgeBlock where you just do SDNV value(getMicroseconds()) then stream "value" into the block. Does SDNV work the same in IBR-DTN as in DTN2? Looking at the SDNV files it looks fairly different. Do you need to use SDNV in the primary block or is this handled by default somewhere else? Do you have any other examples of extension blocks using SDNV for IBR-DTN? Thanks. Carson Dunbar

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Re: [ibr-dtn] Ibr-dtn and bytewalla
by Johannes Morgenroth 28 Mar '12

28 Mar '12

Am 26.03.2012 17:49, schrieb Felipe Pereira: > Yes, i'm using Bytewalla on android. > > The clock's phone was already set to UTC time; i was thinking, maybe > is has something to do with Brazil's time, because here we use 24h > clock... > > But even setting 12h clock, it didn't work. Maybe bytewalla really > doesn't work properly with ibr-dtn? As I said before, may knowledge about bytewalla is too small to say anything about specific issues. An interoperability is possible but not known yet. Since we are inter-operable with DTN2 and ION, and as far as I know bytewalla is is inter-operable with DTN2, I do not assume a major issue between the implementations. But I am pretty sure it has nothing to do with the 12h / 24h clock setting. Kind regards, Johannes Morgenroth -- Johannes Morgenroth Institut fuer Betriebssysteme und Rechnerverbund Tel.: +49-531-391-3249 Muehlenpfordtstrasse 23 Fax.: +49-531-391-5936 TU Braunschweig D-38106 Braunschweig

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Re: [ibr-dtn] Ibr-dtn and bytewalla
by Johannes Morgenroth 26 Mar '12

26 Mar '12

The only source for expired bundles is that the daemon assumes that the bundle is too old. I do not known enough about the bytewalla implementation to guess about interoperability issues, but there is an known difference between time in Java on standard PCs and Android OS. I guess you are using bytewalla on Android, right? Please set the clock of the phone to UTC time and try again. Kind regards Johannes Am 26.03.2012 17:14, schrieb Felipe Pereira: > Thanks for the quick response! > > Yes, it was my first attempt to resolve the problem, but > unfourtunately it wasn't the solution. > > The time on the phone and the router are set accordingly. Is there > another cause for bundle expiritaion? > > Thanks in advance. -- Johannes Morgenroth Institut fuer Betriebssysteme und Rechnerverbund Tel.: +49-531-391-3249 Muehlenpfordtstrasse 23 Fax.: +49-531-391-5936 TU Braunschweig D-38106 Braunschweig

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Re: [ibr-dtn] Ibr-dtn and bytewalla
by Johannes Morgenroth 26 Mar '12

26 Mar '12

Hello Felipe. Your issue description sounds like there is just a time synchronization issue. Please assure that the clock of all nodes are synchronized. Kind regards, Johannes Morgenroth Am 26.03.2012 02:28, schrieb Felipe Pereira: > Hello Mr. Morgenroth, > > My name is Felipe Souza Pereira, I'm a student from Federal University > of Pará (UFPA). > > I've sent you this e-mail hoping that you could give me some advice, > if possible of course, in how to use Ibr-dtn with another DTN project > called Bytewalla: > > http://www.tslab.ssvl.kth.se/csd/projects/092106/ > > I'm using ibr-dtn on a router, with openwrt, which model is a TP-LINK > TL-WR1043ND, with the ar71xx architecture. > > So far I've managed to send only a Hello(SYN) bundle packet from the > android phone to the router (static conection mode only), but when > ibr-dtn receives it, it says that the bundle is expired. > > I did a lot of research on the internet, but unfourtunately it's a > very specific case, so I decided to send this e-mail. > > Thank you very much for your attention. > -- Johannes Morgenroth Institut fuer Betriebssysteme und Rechnerverbund Tel.: +49-531-391-3249 Muehlenpfordtstrasse 23 Fax.: +49-531-391-5936 TU Braunschweig D-38106 Braunschweig

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dtnstream fdsink.
by Luís Octávio Zimmemann de Borba Maia 22 Mar '12

22 Mar '12

I'm trying to do some testing with dtnstream. as far as I understand it, dtnstream uses stdout to send and stdin to receive bundles in order. I want to make a transmission using a webcam (USB) using gstreamer. I'm trying this: gst-launch v4l2src device=/dev/video1 ! video/x-raw-yuv, width=320,height=240,framerate=10/1 ! ffmpegcolorspace ! smokeenc keyframe=8 qmax=40 ! fdsink fd=1 | ./dtnstream -d dtn://nc1.dtn/video ./dtnstream -s video | gst-launch fdsrc ! smokedec ! ffmpegcolorspace ! fakesink dump=true async=false dtnd receives data from stream but the second command does not play the video. Any help or examples of a working pipe(preferably webcam) is welcome. *---------------------* # Luís Octávio Zimmermann de Borba Maia # Pesquisador na área de redes - GCAP - IFC # Acadêmico do 5° período em Sistemas de Informação - Instituto Federal Catarinense # http://about.me/luis.zimmermann

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job description and help about which tool to use?
by Felipe Pereira 19 Mar '12

19 Mar '12

Hello, What I want to do is to pass multimedia (images and videos). For that, I'll use a machine (desktop), a fixed access point (with OpenWRT) installed in a certain place and a car with a laptop in receiving the information transmitted by the desktop. stream stream Desktop ---------> Acess Point -----------> Laptop. More specifically when the stream got the laptop I wanted to appear a picture and / or video on the laptop screen. But to believe that I have to develop something using the API of the IBR-dtn. I believe that to do so have to use the tool dtnstream, so I've been posting constantly on the tool dtnstream. You can do this with another tool? Thanks for the replies! Greetings.

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job description and help about which tool to use?
by Felipe Pereira 17 Mar '12

17 Mar '12

Hello, What I want to do is to pass multimedia (images and videos). For that, I'll use a machine (desktop), a fixed access point (with OpenWRT) installed in a certain place and a car with a laptop in receiving the information transmitted by the desktop. stream stream Desktop ---------> Acess Point -----------> Laptop. More specifically when the stream got the laptop I wanted to appear a picture and / or video on the laptop screen. But to believe that I have to develop something using the API of the IBR-dtn. I believe that to do so have to use the tool dtnstream, so I've been posting constantly on the tool dtnstream. You can do this with another tool? Thanks for the replies! Greetings.

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USING DTNSTREAM
by Felipe Pereira 16 Mar '12

16 Mar '12

Sebastian, Thank you for responding. Now that I have your answer. So, I ran the command you said and did this: teste@debian:~/ibrdtn-tools-0.6.5/src$ arecord -d 100 | dtnstream -c 5000 -d dtn://debian/yousuffer.mp3 Recording WAVE 'stdin' : Unsigned 8 bit, Rate 8000 Hz, Mono I do not know what that means! :( Thanks. Felipe.

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USING DTNSTREAM BETWEEN TWO HOSTS
by Felipe Pereira 14 Mar '12

14 Mar '12

Hello IBRDTN, How do I forward an audio or video file between two computers that are on the same network? The dtnd was run on two computers. I used dtnstream on a computer by specifying the desired destination and trying to get the stream with the other computer dtnrecv Any help? Felipe

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NC router on IBR-DTN
by Carson Dunbar 13 Mar '12

13 Mar '12

Hello Johannes, I'm currently trying to work on a new router for IBR-DTN based on the ebr and simpleNC router for DTN2. I am basically trying to transcribe the code for those routers into IBR-DTN. Right now I am trying to work on a block processor so that I can use extension blocks for carrying encoded bundles. Where in the IBR-DTN code can I look for a block processor or does IBR-DTN handle block processing in a significantly different manner than DTN2? If so could you explain how extensions blocks are created and handled? Thank you Carson Dunbar

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