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

Re: [ibr-dtn] API function IBR-DTN build 1.0.1
by Johannes Morgenroth 25 Mar '17

25 Mar '17

Hello Matthijs, the 'management protocol' does have a 'exit' command while switching back from 'extended procotol' is prohibited because this would destroy your application state. If you're app wants to act as application as well as executing management calls, you can and should open two separate API connections. Kind regards, Johannes Am 20.03.2017 um 11:36 schrieb Matthijs Visser: > Dear Sir/ Madam, > > I have a question regarding IBR-DTN build 1.0.1. > > Is it possible to switch from the 'extended protocol' to the 'management > protocol' and vice versa in the API? I would like to use functions from > both these protocols at the same time without having to open two > instances of the API. The 'event protocol' has an 'exit' command to > return to level 0, but as far as I know the extended and management > protocol lack this command. > > I'm looking forward to hearing from you. > > -- > Best regards, > > Matthijs Visser

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Fragmented bundles: transfer completed at the sender, but merge error at the receiver
by Thomas Halwax 19 Mar '17

19 Mar '17

Hi all, I’m trying to transmit bundles with the UDPDatagram Convergence Layer over a unreliable channel provided by the EMANE emulator. I enabled fragmentation with a limit of 768 bytes. Using dtnsend and dtnrcv I transmit a file with exactly 1024 bytes. On the sender side the file got fragmented and transmitted successfully: … Mon Mar 13 22:51:00 2017 NOTICE QueueBundleEvent: New bundle queued [542757060.1.0.768] dtn://radio-1.dtn/EHGiveKLXRJKYhcO Mon Mar 13 22:51:00 2017 NOTICE QueueBundleEvent: New bundle queued [542757060.1.768.256] dtn://radio-1.dtn/EHGiveKLXRJKYhcO … Mon Mar 13 22:51:01 2017 NOTICE TransferCompletedEvent: transfer of bundle [542757060.1.0.768] dtn://radio-1.dtn/EHGiveKLXRJKYhcO to dtn://radio-2.dtn completed Mon Mar 13 22:51:02 2017 NOTICE TransferCompletedEvent: transfer of bundle [542757060.1.768.256] dtn://radio-1.dtn/EHGiveKLXRJKYhcO to dtn://radio-2.dtn completed ————— On the receiver side there seems to be a problem reassembling the bundle: Mon Mar 13 22:51:01 2017 NOTICE BundleCore: Bundle received [542757060.1.0.768] dtn://radio-1.dtn/EHGiveKLXRJKYhcO from dtn://radio-1.dtn Mon Mar 13 22:51:02 2017 NOTICE BundleCore: Bundle received [542757060.1.768.256] dtn://radio-1.dtn/EHGiveKLXRJKYhcO from dtn://radio-1.dtn … Mon Mar 13 22:51:02 2017 DEBUG.20 FragmentManager: found 2 fragments similar to bundle [542757060.1.768.256] dtn://radio-1.dtn/EHGiveKLXRJKYhcO Mon Mar 13 22:51:02 2017 DEBUG.20 FragmentManager: fragment: [542757060.1.0.768] dtn://radio-1.dtn/EHGiveKLXRJKYhcO Mon Mar 13 22:51:02 2017 DEBUG.20 FragmentManager: fragment: [542757060.1.768.256] dtn://radio-1.dtn/EHGiveKLXRJKYhcO … Mon Mar 13 22:51:02 2017 DEBUG.5 MemoryBundleStorage: got bundle duplicate [542757060.1.0.768] dtn://radio-1.dtn/EHGiveKLXRJKYhcO Mon Mar 13 22:51:02 2017 DEBUG.5 MemoryBundleStorage: got bundle duplicate [542757060.1.768.256] dtn://radio-1.dtn/EHGiveKLXRJKYhcO Mon Mar 13 22:51:02 2017 NOTICE QueueBundleEvent: New bundle queued [542757060.1.0.768] dtn://radio-1.dtn/EHGiveKLXRJKYhcO Mon Mar 13 22:51:02 2017 DEBUG.20 FragmentManager: found 2 fragments similar to bundle [542757060.1.0.768] dtn://radio-1.dtn/EHGiveKLXRJKYhcO Mon Mar 13 22:51:02 2017 DEBUG.20 FragmentManager: fragment: [542757060.1.0.768] dtn://radio-1.dtn/EHGiveKLXRJKYhcO Mon Mar 13 22:51:02 2017 NOTICE QueueBundleEvent: New bundle queued [542757060.1.768.256] dtn://radio-1.dtn/EHGiveKLXRJKYhcO Mon Mar 13 22:51:02 2017 DEBUG.20 FragmentManager: fragment: [542757060.1.768.256] dtn://radio-1.dtn/EHGiveKLXRJKYhcO Mon Mar 13 22:51:02 2017 DEBUG.2 BundleStorage: remove bundle from index: [542757060.1.0.768] dtn://radio-1.dtn/EHGiveKLXRJKYhcO Mon Mar 13 22:51:02 2017 NOTICE BundlePurgeEvent: purging bundle [542757060.1.0.768] dtn://radio-1.dtn/EHGiveKLXRJKYhcO Mon Mar 13 22:51:02 2017 DEBUG.2 BundleStorage: remove bundle from index: [542757060.1.768.256] dtn://radio-1.dtn/EHGiveKLXRJKYhcO Mon Mar 13 22:51:02 2017 NOTICE BundlePurgeEvent: purging bundle [542757060.1.768.256] dtn://radio-1.dtn/EHGiveKLXRJKYhcO Mon Mar 13 22:51:02 2017 ERROR FragmentManager: could not load fragment to merge bundle Any help is very welcome! Thanks & best regards Thomas

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Fragmentation and timestamp of bundles
by Leonel Gaspar Soares 16 Mar '17

16 Mar '17

I'm currently analysing bundle sending with wireshark, and I see that when a node is not a time reference, it sends bundles with timestamp 1 Jan 2000. These are accepted by another node, witch also is not a time reference. Are bundles with timestamp 1 Jan 2000 always accepted? How can fragmentation be made in ibrdtn with OpenWrt?

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Convergence Layer for VHF radios
by Thomas Halwax 13 Mar '17

13 Mar '17

Hi, for my Bachelor Paper I’d like to use IBR-DTN over VHF radios. These devices have a RS-232 serial interface. I know there is a AX.25 convergence layer for DTN2. Is there something similar for IBR-DTN or do you have any suggestions? Thanks in advance, Thomas

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IBRDTN between 2 nodes across the internet
by Walter L. Preuninger II 13 Mar '17

13 Mar '17

I have tried several combinations of ibrdtn.conf stanzas to get 2 hosts talking dtn, but I have not had any success. Could someone show me an example configuration for 2 hosts, routed thru the internet by tcp? I have tried with and without DHT. Thanks for any and all assistance, Walter -- Sent from Gmail Actual

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