Display Welcome message upon successful netcat connection

Question

I have 2 terminals with title SERVER and CLIENT

I have setup a netcat listener on SERVER with below command

nc -lvp 12345

and from CLIENT i connect to it using

nc 127.0.0.1 12345

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When ever a client connects to the server, i just want to be informed on server that a client has connected.

Answer 1

(echo "Welcome"; cat) | nc -lvp 12345