On 8/24/06, Jose L. Ponce <[EMAIL PROTECTED]> wrote:
> Jose,
>
> To connect to multiple motes you would write something along the lines of:
> [...]
Thanks a lot for that. I had been trying to use these phoenix sources
a while ago but didn't get to make my program work.
This means that when I start a java program that wants to talk to
different motes through different SerialForwarders, it needs also
needs to read from a table for each mote id in which USB port it is
connected.
What's more, if I want to send a message to mote "100", for example, using
mote_if_of_mote100.send(100, message);
and
mote_if_of_mote100.send(TOS_BCAST_ADDRESS, message);
will give the same result.
Right.
But this would also mean that it is not possible to send a message to
_all_ motes simultaneously, right? This would be a big problem...
That's correct. Simultaneous transmission to all motes over usb would
be difficult over a point to point link such as USB . USB host
schedules transmissions to individual endpoints on a 1 ms granularity,
and depending on the precise timing of requests you may observe as
much as 2 ms between requests. It sounds like if you want motes to
receive a message simultaneously, a radio broadcast channel may be
appropriate.
Cheers,
Rob
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