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

Bundle persistent storage - extra kilobytes seen in bundle files
by I-Rajagopalan, Vijayasarathy 01 Jun '17

01 Jun '17

Hi all, I configured IBR-DTN to use persistent storage bundles (storage_path=<bundle storage location> and storage=default in ibrdtnd.conf). When I use dtninbox/dtnoutbox for file transfer, I see that bundle files in the bundle storage location (files whose names start with "8286") always seem to have a few extra kilobytes stored. By opening the file, I see that maybe the entire header for the bundle is stored inside the file, but there are a few kilobytes of characters after the payload, irrespective of the size of the payload. The size of these extra bytes varies from 4KB to 10KB. Could anyone explain what these bytes are for ? This may be particularly relevant while considering persistent storage requirements of constrained systems, when file size is also small. The situation is the same for both UDP and TCP convergence layers. Thanks and regards, Vijayasarathy

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Data mule problem
by Leonel Gaspar Soares 29 May '17

29 May '17

I have been working with ibr-dtn and a data mule (alix3d3) to transport bundles between nodes. But in many contacts of 20 s, no files are transfered, using dtnoutbox application. How can this be explained and solved?

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File sharing
by Leonel Gaspar Soares 20 May '17

20 May '17

Are there any applications for file sharing in ibr-dtn? do they work ok?

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(no subject)
by Leonel Gaspar Soares 17 May '17

17 May '17

Hello, I would like to print the hash string of my files in dtnoutbox, but when I make this line in the code: cout << of.getHash().getHash()<<endl; to get all the hashes, the caracters that I see are not readable. Can anybody help me to convert these characters to readable form? Thanks

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Confirmation of file sending
by Leonel Gaspar Soares 17 May '17

17 May '17

Can anybody explain me please if there is any confirmation of receptions of files or bundles in IBRDTN applications? How does the confirmation works?

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Bundle authentication problem
by Leonel Gaspar Soares 16 May '17

16 May '17

Hello, I've just updated IBRDTN packages in two debian virtual machines, but after installing packages, bundles are rejected between them due to bundle authentication. Anybody knows how to solve this?

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IBRDTN discovery and summary vector exchange issues
by Vijayasarathy Rajagopalan 16 May '17

16 May '17

Hi All, I am using the IBR-DTN to demonstrate simple file transfer in my experiments. Setup: A cross section of my network looks like this: Opportunistic contact Opportunistic contact NodeB<--------------------------------------->NodeU<---------------------------------------->NodeG NodeU moves between NodeB and NodeG to make opportunistic contact. For each contact NodeU pauses for 5-10 seconds. I have configured prophet with the following parameters in all three nodes. ### prophet configuration ### #prophet_p_encounter_max = 0.8 #affects how strong the predictability is #increased on an encounter prophet_p_encounter_first = 0.7 #the predictability of a neighbor on the #first encounter prophet_p_first_threshold = 0.1 #lowest predictability when neighbors #predictabilities are forgotten prophet_beta = 0.9 #Weight of the transitive property prophet_gamma = 0.999 #Determines how quickly predictabilities #age #prophet_delta = 0.01 #(1-delta) is the maximum predictability prophet_time_unit = 1 #time unit in seconds prophet_i_typ = 120 #typical time interval between two node #encounters #prophet_next_exchange_timeout = 120 #timeout how often handshakes should be #executed prophet_forwarding_strategy = GRTR #The forwarding strategy used GRTR | GTMX #prophet_gtmx_nf_max = 30 #Maximum times to forward in the GTMX #strategy For each node contact, I expect that the predictability map will be exchanged via call to the dtn://NodeName.dtn/routing service, and bundles will be transferred suitably. Problem: * For many contacts (given the above mobility assumptions), NodeU does not seem to discover NodeB/NodeG. I assume that discovery has happened, if I see a "New node available" string in the log file. * Even for contacts where NodeU seems to have discovered the other node, Predictability map does not seem to be exchanged. A partial log file has been attached, where NodeU seems to have discovered NodeG (at the first beacon exchange itself), but they do not seem to exchange their predictability maps. Am I configuring anything wrong with respect to prophet ? Also, I see a "summary vector of <node eid> is expired" in log every 60 seconds for some nodes. Please help. I have attached the following: a) ibrdtn config file for NodeB; b) ibrdtn config files for NodeG and NodeU (same file); c) Portion of NodeU.log

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Re: [ibr-dtn] (no subject)
by Jennifer Lankford 09 May '17

09 May '17

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Re: [ibr-dtn] (no subject)
by Jennifer Lankford 09 May '17

09 May '17

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1 0

Video Streaming issue
by Leonel Gaspar Soares 09 May '17

09 May '17

Hello, my video streaming from camera (axis 207) is not working. I'm using two alix3d3 and can see the streaming rtsp in source, but I cant get it in vlc on the receiver. On sender, I'm using cvlc rtsp://192.168.1.4/mpeg4/media.3gp --sout=file/mp4:- | dtnstream -l 3600 -d dtn://node2.dtn/streamReceiver -s streamSource and on receiver side dtnstream -s streamReceiver | vlc are any of these commands wrong? camera IP is 192.168.1.4

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