How to continuously send data to client from server

I want to continuously send data from server to client. On the client side, I only want the received data to be displayed. How to continuously send data to client? echo "Hello, client!" | nc did not work.

Thanks in advance

You can see example script of server side below:

#!/bin/bash

while true
do
    echo "Sending message to client..."
    echo "Hello, client!" | nc <ip> <port>
done

Solution

Your nc command is missing -l (listen) parameter to behave as a server.

Try this:

#!/bin/bash

while true
do  
    echo "Sending message to client..."
    echo "Hello, client!" | nc -l 10000
done

In another terminal, connect as a client as many times as you want and you'll see the message sent:

$ nc localhost 10000
Hello, client!
^C  
$ nc localhost 10000
Hello, client!
^C

EDIT: To send messages to the client without needing to reconnect, you can create a fifo, make the server read this fifo continuously and forward this data to the client:

$ mkfifo fifo_toclient
$ tail -f fifo_toclient | nc -l 10000

Run the client side command as before:

$ nc localhost 10000

In another terminal and in the same directory, modify your script to write data to the pipe instead of directly to nc and run it:

$ cat send_to_client.sh
#!/bin/bash

while true
do  
    echo "Sending message to client..."
    echo "Hello, client!" > fifo_toclient
    sleep 1
done
$ bash ./send_to_client.sh

And you should see the messages in the output of the client side.