Simple UDP sample

I’m looking for a simple UDP sample.
I’m a beginner and the Language Reference doesn’t support me with a simple UDP sample.
I want to:
___ I want to find a network participant and identify him.
___ He is located in the same subnet.
___ I have to send three bytes as broadcast by UDP at port 9090.
___ A matching participant answers with 40 bytes.

Can somebody help me?

here is something about broadcast and multicast
documentation.xojo.com/topics/communication/internet/communicating_via_udp.html

If the applications are both made in Xojo. Just use AutoDiscovery it’s based on UDP and has examples in Internet/Networking .

At documentation.xojo.com/topics/communication/internet/communicating_via_udp.html everything has to be created from scratch. Since I’m not a professional I have a problem with that.
The UDP AutoDiscovery examples in Internet/Networking doesn’t match well for me.
I’m looking forward for more.
Bernd