"Estabridis, Janet P" wrote:
>
> I'm sure this is an easy question for anyone who is a network expert...
>
> We have a local network with embedded computers. What is desired is to send
> a packet that all the embedded computers will receive. Is there such a
> broadcast command ? Is there a good book with an example ?
>
Hi,
2 solutions :
- if you use an ethernet card driven by linux ( no real-time ),
the best solution is to send a Broadcast UDP packet on the network with
all
client listening for UDP packet on specific port, like that, everybody
will
receive this packet simultanously without connection, but it is not
real-time
and time between reception and processing will not be constant ...
- if you write a handler for your ethernet card ( real-time driver ),
just send an
ethernet packet :
hw addr destination : FF FF FF FF FF FF
hw addr source : the hw address of emitter (or other ...)
protocol : 0x9000 for exemple ( don't use ip proto if the
network is open !)
the data if needed ...
the other card initialised on the network will receive this packet as
short/physical broadcast packet.
Chris.
--
Kumsta Christophe
Machinery Agrobotic Fruit
<[EMAIL PROTECTED]>
Real-Time image processing developper
RT-Linux/RTAI ( Use the Source Luck !)
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