Hi David!
Thanks for your help!
I have one more question for you...thanks in advance!
I have read a post on tinyos-help about Ack in Broadcast massages: "Should
software ACK mimic hardware ACK as much as possible and provide
acknowledgment for broadcasts as well?" and your answer: "SACK should mimic
HACK, and is setup to do so better in the next rev that I haven't
uploaded yet."
I have read also: "When you send to AM_BROADCAST_ADDR, it doesn't run on Ack
mode"
SO I have a question for you: Acks are only sent for unicast messages, not
broadcasts? If I transmitted packets to all motes with
AM_BROADCAST_ADDR, are they acknowledged on all motes?
In case of broadcast, couldn't I get acknowledge? Only after I change broadcast
to peer-to-peer (unicast) can I get acknowledge?
Thanks
Cheers
Andrea
----- "David Moss" wrote:
>
Hi Andrea –
You cannot specify a subset of nodes to send a packet to without programming in
your own logic (i.e. deliver the packet to the broadcast address and include
the list of addresses that should accept the packet within the payload). The
AM_BROADCAST_ADDR is the address to use when you want a packet to get delivered
to more than one node.
Please send questions to [email protected]
-David
From: Andrea Maestrini [mailto:[EMAIL PROTECTED]
> Sent: Friday, July 11, 2008 12:34 AM
> To: [EMAIL PROTECTED]
> Cc: [EMAIL PROTECTED]
> Subject: multicast messages
Hi to all!
>
> I 'm new in TinyOS world and I have read the TEP 126 CC2420 RAdio Stack and
> TinyOS 2.0 tutorial and I have a doubt....I have a simple question for you:
>
> - How to send a packet to a group of nodes but not to all of them? I can do
> broadcast "AM_BROADCAST_ADDR" and unicast "by specifying the node address"
> but how to do multicast in AMSend.send( ) ? In TinyOS 2.0 Can I do multicast
> comunication?
> Thanks for your help!
> Andrea
>
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