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

IBR-DTN - Buildroot Port
by João Ferreira 06 Jun '12

06 Jun '12

Hi list, I'm "porting" ibrdtn to buildroot ( http://buildroot.uclibc.org/ ), "targeting" ARM9 architecture. To do that, I'm using BR packages. I made 3 distinct packages, one per ibrdtn "module": ibrcommon, ibrdtn and ibrdtnd (all with 0.8 version). Since I have a lot of available storage constraints (~8Mb), I disabled the support for: openssl, 802.15.4 (lowpan), sqlite, compression, tls, dtnsec and curl. Those 3 BR packages seems to configure, compile and install as expected, and inside my embedded system, I have: # ldd /usr/sbin/dtnd librt.so.0 => /lib/librt.so.0 (0x401bb000) libibrcommon-0.8.so.1 => /usr/lib/libibrcommon-0.8.so.1 (0x401c7000) libibrdtn-0.8.so.1 => /usr/lib/libibrdtn-0.8.so.1 (0x40149000) libm.so.0 => /lib/libm.so.0 (0x40199000) libc.so.0 => /lib/libc.so.0 (0x400a6000) libdl.so.0 => /lib/libdl.so.0 (0x4010d000) libpthread.so.0 => /lib/libpthread.so.0 (0x4004a000) ld-uClibc.so.0 => /lib/ld-uClibc.so.0 (0x40097000) # # uname -a Linux emb 2.6.38emb #68 Thu Feb 9 16:43:56 WET 2012 armv4tl GNU/Linux # # free -k total used free shared buffers Mem: 29296 20700 8596 0 188 -/+ buffers: 20512 8784 Swap: 0 0 0 # # df -h Filesystem Size Used Available Use% Mounted on /dev/root 7.7M 6.1M 1.2M 84% / tmpfs 14.3M 0 14.3M 0% /dev/shm tmpfs 14.3M 56.0K 14.3M 0% /tmp # The problem is when I try to launch dtnd daemon with default configuration file I get: # dtnd -c /etc/ibrdtnd.conf Wed Jun 6 02:44:05 2012 INFO: Configuration: /etc/ibrdtnd.conf Wed Jun 6 02:44:05 2012 INFO: IBR-DTN daemon 0.8.0 (build 52262) Aborted # echo $? 134 # Also, system clock is correct. If I change the daemon user to "daemon" I get more output, but the error remains # dtnd -c /etc/ibrdtnd.conf --nodiscovery -d999999 --badclock --noapi -ieth0 Wed Jun 6 02:47:35 2012 INFO: Configuration: /etc/ibrdtnd.conf Wed Jun 6 02:47:35 2012 INFO: IBR-DTN daemon 0.8.0 (build 52262) Wed Jun 6 02:47:35 2012 INFO: debug level set to 999999 Wed Jun 6 02:47:35 2012 INFO: use logfile for output: /var/log/ibrdtn.log Wed Jun 6 02:47:35 2012 INFO: Switching user to daemon Aborted # echo $? 134 # I also tried with some modifications in config file without success. Someone have idea what can cause these weird error? Is the code 134 documented somewhere? Thank you for your time, João Ferreira

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Invitation to DTN-Workhop@Aalto
by Kurnikov Arseny 05 Jun '12

05 Jun '12

Hi, we would like to invite you to a DTN workshop on July 9th-11th. The format and agenda will be similar to the previous IBR-DTN workshop that took place in Braunschweig in 2011. So we'll have short-talks about participant work areas, hands-on development and some experiments with the real-world devices and software. The main focus will be on IBR-DTN implementation but anything DTN-related can be discussed, tried on, evaluated etc. The prerequisite is a general understanding of DTN. This year the workshop will be hosted by Aalto University, Finland. For the registration, please send an email to arseny.kurnikov(a)aalto.fi, before June, 22nd. There is no registration fee. Feel free to ask any questions, I'll be glad to help. Best regards, Arseny. -- Arseny Kurnikov School Of Science and Technology Tel.: +358-44-9-6666-38 Otakaari 5 Fax.: +358-9-470-22474 Aalto University FIN-02150 Espoo

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SQlite storage and the SQLBundleQuery class
by brenton＠cs.wisc.edu 11 May '12

11 May '12

Hi, We are looking at the different storage types in IBRDTN, and trying to understand SQLite in particular. We don't understand what this line in get() should do. SQLBundleQuery &query = dynamic_cast<SQLBundleQuery&>(cb); The SQLBundleQuery seems like an abstract class, and we don't see anything extending it to add actual functionality. What is the intention with this cast? Our other question is the nested while loops in get(). We are guessing that it's paging through the MetaBundles in the database, 10 at a time, to avoid loading too much into RAM. Is that right? Thanks, Brenton

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Case Study Ibrdtn
by Felipe Pereira 07 May '12

07 May '12

I'm trying to do a case study protocol ibrdtn (latest version), a TP-LINK router and two laptops. I have already installed the equipment in the three protocols. I configured the laptop and the router on the same network and tried to make them talk. I want to transmit a packet via a notebook (dtnsend) to another notebook (dtnrecv). What I did was startar daemon (dtnd) on the router and notebook computers. Dtnsend used in a notebook and dtnrecv the other. But it still fails. I startei ibrdtn in the router with the command: /etc/init.d/ibrdtn start. For the package out of a notebook A, arriving at the router and send it to a notebook B. What does it take for him (the router) to make this mediation? You have something configured router: /etc/config/ibrdtn? could you help me? Sorry for my English.

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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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