Hi...
Microchip use a "Discovery" protocol to allow devices running their TCP/IP
stack to be easily discovered on a network
This protocol allows the user to quickly discover ALL microchip devices
on a given network
The protocol is UDP based, and just responds to a D being sent to UDP
port 30303 the response contains the MAC and IP address of the Microchip
device
I am trying to write a simple Embarcadero XE project to use this protocol to
discover all devices on my network
What I have done so far
1) Put 2 TWSockets onto a form
1 for listening and 1 for sending
2) set them both to Proto=udp
3) Set the Port property to 30303 on both TWSockets
4) On the Listening TWSocket ==>> Set the Addr property to 0.0.0.0 then call
Listen()
5) On the Sending TWSocket ==>> Set the Addr property to 192.168.1.255
then call Connect()
6) on the Sending socket i call SendStr("D");
7) then I wait for incomming data on the Listening socket using the event
"OnDataAvailable" i call ReceiveStr() and put the data into a TListBox
I am expecting to get a responce from all the Microchip based devices on
the network
192.168.1.101 192.168.1.102
but all i get is one responce from my local PC
Also what is the property that tells you what the IP address the UDP packet
came from ??
Thanks for any help
Ray
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