Hi,

ok, in DTN groups can be a bit confusing,  you have mixed up things a little.

So for SINGLE(ton) endpoints everything works as as you expect: You use the name parameter on dtnsend and recv, and do not touch any of the group parameters. When using dtn:// EIDs the _convention_ is, that dtn://somenode/myapp consists of a part describing the node itself ("somenode") and an application part ("myapp"), which is what the --name parameter sets.

For GROUPS it is a bit differently: According to Bundle Protocol standards an EID (that is, the complete URI), can describe a group. In this case there is no "node" part, so with the ibr-dtn tools you would do for example


echo "Hi there" | dtnsend -g dtn://mygroup/whatever

Note, that there is no --name parameter or anything. You are adressing the group "dtn://mygroup/whatever"

So, to receive on all nodes in the group you can use

dtnrecv --group  dtn://mygroup/whatever

Also no "--name" here, but the _whole_ group EID.

The node names (n1,n2,n3), are not relevant in this case, and habe no relation with the groupname.

Hope, this clears things up a bit

Sebastian

Am 15.01.2014 um 10:15 schrieb Jawad Seddar <jawad.seddar@gmail.com>:

> Hello,
>
> After tinkering a bit with dtnsend and dtnrecv, I noticed the following :
>
> - dtnsend <eid> <file> -g <group> , sends bundles to all nodes except the one with <eid>
>
> For example, if I have 4 nodes : dtn://n1, dtn://n2, dtn://n3, dtn://n4, using dtnsend dtn://n4 <file> -g <group> , from dtn://n1, I see bundles going from dtn://n1 to dtn://n2 and dtn://n3 but not to dtn://n4
>
> My problem is how to retrieve those bundles from dtnrecv?
>
> I tried using dtnrecv --group <group> --file <file> and even adding a name with --name <name> but I'm not seeing any bundles even though I see them reaching the daemon.
>
> I should probably mention that I am using the epidemic router.
>
> Regard,
> Jawad
>
>
> 2014/1/14 Jawad Seddar <jawad.seddar@gmail.com>
> Hi,
>
> I'm trying to send bundles from one node to multiple receivers.
>
> I noticed the -g and --group options in dtnrecv and dtnsend respectively but I can't seem to find the proper way to use these options.
>
> How should I use those options?
> I tried using them the same way I use the --name option in dtnrecv but no luck so far...
>
> Any pointers would be appreciated.
>
> Regards,
> Jawad
>

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