gistfile1

```ruby
require 'socket'

# Create the server using the Socket class
# AF_INET: using IP protocol
# SOCK_STREAM: using TCP
server_socket = Socket.new(Socket::AF_INET, Socket::SOCK_STREAM, 0)

# Set the socket address
sockaddr = Socket.pack_sockaddr_in( 2200, 'localhost' )

# Bind the socket address to the server socket
server_socket.bind( sockaddr )

# set the state to listen
server_socket.listen(5)

# Block for incoming connection from client by accept method
# The return value of accept contains the new client socket object and the remote socket address
client, client_sockaddr = server_socket.accept

# Receive data using recvfrom method on the new client socket
data = client.recvfrom( 20 )[0].chomp
puts "I only received 20 bytes '#{data}'"

# Send back the data
client.puts "You said: #{data}"

# Wait 1 second and close the server socket
sleep 1
server_socket.close
```