Hi Paul,
It should be not too complicated to achieve such things with UDP Broadcast
and Multicast, the main problem IMO is the lack of proper documentation
how Multicast works. Long time ago, I have written a demo application,
which does the same things as what you need but I can remember that at the
beginning I must also discover it on Try & Error basic.
Basically the Sender uses the Indy Multicast Server Component (not the
Client Component!) to send out the message and the TIdUDPClient or
TIdUDPServer to broadcast:
- Multicast: you must specify the destination Multicast group, i.e:
224.255.255.001 and a port, i.e: 1978 than use
IdIPMCastServer1.Send('a Message') to send it out.
- UDP Broadcast: just use IdUDPServer1.Broadcast('Hello',<Port>) : <Port>
is the listening port.
On the Client: using the MCastClient and UDPServer respectively.
- Multicast: set the Multicast group i.e. 224.0.0.1 and the DefaultPort
than activate it to listen
- UDP Broadcast: set the DefaultPort than activate it.
Per onRead event handler you can write down to see what the client
actually received.
That is all!
On Wed, 16 Jul 2008 16:28:56 +0700, <[email protected]> wrote:
> Delphi (intermediate-level only)
> Messages In This Digest (1 Message)
>
> 1.
>
> UDP Broadcast From: Paul Bennett
> View All Topics | Create New Topic Message
>
> 1.
>
> UDP Broadcast
>
> Posted by: "Paul Bennett" [EMAIL PROTECTED] rm28157
>
> Wed Jul 16, 2008 2:24 am (PDT)
>
> I'm having real problems with this (which I'm sure is actually really
> easy).
>
> I'm working on a Client/Server application which will be running over
> our LAN. What I would like to do is when a Client starts up it sends a
> UDP broadcast to a specific Port which is being monitored by the
> Server app. When the server gets the broadcast it responds by sending
> a UDP message back to the originating client containing the servers IP
> address.
>
> All future traffic between Client and Server would then be Peer to
> Peer across TCP/IP.
>
> I have created two test apps, one broadcasts the UDP message (Client)
> and the other (Server) should respond, both apps contain UDPServer and
> UDPClient components. My problem is that the Server
> never seems to receive the Message.
>
> Can anyone either point me to some code that works that I could use
> that as my starting point, or explain, in words of one syllable how to
> achieve my aim?
>
> TIA
>
> Paul
>
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