Re: [Contiki-developers] Broadcasting message from server to client-nodes

[badis d. <bad...@gm...>]

Hi,
you are in the heart of the multicast problem in 6LoWPANs...

As you probably know, RPL is mainly a unicast routing protocol (with a
possibility to support multicast). However, its core implementation
incontiki only supports unicast traffic.


Fortunately for you, 15 days ago, support for multicast in contiki has been
added.

You can find the code here:
https://github.com/contiki-os/contiki/tree/master/core/net/ipv6/multicast

This code implements two multicast protocols: SMRF and ROLL-TM.

SMRF add multicast support to RPL as described in George's paper:
http://www.spd.gr/Files/Oikonomou-2012-1-persens.pdf (There is a following
journal paper extending this one).

ROLL-TM implements the first draft of the IETF MPL protocol that can be
found here: https://tools.ietf.org/html/draft-ietf-roll-trickle-mcast-01

As you can see from the README file, the best place to start is
examples/ipv6/multicast which gives a cooja example demonstrating the basic
functionality of the protocols


 Hope this helps

all the best

badis




On 23 March 2014 11:09, Mariem zayéne <zay...@gm...> wrote:

> Hi developers,
>
> I have a problem with broadcasting messages from server to clients in the
> rpl-udp example.
>
> I used this method in udp-server.c (executed every 10min) :
>
> uip_create_linklocal_allnodes_mcast(&server_conn->ripaddr);
>
>  But in this case, server send messages only to clients existing in its
> vicinity, and if i will use it in udp- client.c , it will be many
>
>  duplicated messages, and server will receive his message too...
>
>
> I don't find a solution for server to broadcast message to all
> client-nodes. What can I do to resolve it ?
>
>
>  Thanks in advance.
>
> Best regards,
>
> Mariem
>
>
>
>
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