echo

A simple server which echos back the data that it is sent.

How to Compile

With a minimal Pony installation, in the same directory as this README file run ponyc. You should see content building the necessary packages, which ends with:

...
Generating
 Reachability
 Selector painting
 Data prototypes
 Data types
 Function prototypes
 Functions
 Descriptors
Optimising
Writing ./echo.o
Linking ./echo

How to Run

Once echo has been compiled, in the same directory as this README file run ./echo. You should see a message containing your local address and a randomly selected port number:

$ ./echo
listening on 127.0.0.1:40503
...

Your program is now listening for any message sent to your local address on the selected port number. To check the program is working as intended, you should open a second terminal window and run the following netcat command matching the local address and port from the echo program:

$ nc 127.0.0.1 40503
...

This gives us a client which we can use to send echo a message. try typing any message and the echo program will echo it back to you.

$ nc 127.0.0.1 40503
Hello world!
server says: Hello world!
...

Program Modifications

Modify your program to send a welcome message to a user which provides instructions on interacting with the server.

$ ./echo
listening on 127.0.0.1:40503
...

$ nc 127.0.0.1 40503
Welcome! Write your message below then hit the Enter key.
Hello world!
server says: Hello world!
...