[ibr-dtn] Send a message for a group

Hi all,

Looking at the dtnsend command option, i found the option -g which can be used to send a message for a group. I am wondering how can I define a group.

Example I have 4 machines( host1, host2, host3, and host4)

1. I want to send a message from host1 to host2 and host3. How can I do this ?

2. I want to broadcast the message for all my neighbors (host1 ==> hosts 2, 3 and 4) How can I broadcast.?

I checked on IBR DTN documentation, but I found only how to send from one host to another one.

Any help will be appreciated.

Best regards, Farouk