June 2017 - Ibr-dtn - lists.ibr.cs.tu-bs.de

Sample API reference programs for developers
by I-Rajagopalan, Vijayasarathy 29 Jun '17

29 Jun '17

Hello, Are there any sample API reference programs available on the web for developers who want to use IBR-DTN library (libibrdtn.so) ? I am looking for functions like start/stop DTN daemon, file transfers (for which I find DTN tools code useful) and so on. Thanks, Vijay

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dtnoutbox hash value
by Leonel Gaspar Soares 10 Jun '17

10 Jun '17

Hello, I need to understand the code of dtnoutbox for research work, but the hash value of the files seams to change each time file is saved with no alteration. Shoul'dnt MD5 hash value remain if content is not changed?

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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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