package main

import "net"
import "fmt"
import "bufio"
import "strings" // only needed below for sample processing

func main() {

  fmt.Println("Launching server...")

  // listen on all interfaces
  ln, _ := net.Listen("tcp", ":8081")

  // accept connection on port
  conn, _ := ln.Accept()

  // run loop forever (or until ctrl-c)
  for {
    // will listen for message to process ending in newline (\n)
    message, _ := bufio.NewReader(conn).ReadString('\n')
    // output message received
    fmt.Print("Message Received:", string(message))
    // sample process for string received
    newmessage := strings.ToUpper(message)
    // send new string back to client
    conn.Write([]byte(newmessage + "\n"))
  }
}

package main

import "net"
import "fmt"
import "bufio"
import "os"

func main() {

  // connect to this socket
  conn, _ := net.Dial("tcp", "127.0.0.1:8081")
  for { 
    // read in input from stdin
    reader := bufio.NewReader(os.Stdin)
    fmt.Print("Text to send: ")
    text, _ := reader.ReadString('\n')
    // send to socket
    fmt.Fprintf(conn, text + "\n")
    // listen for reply
    message, _ := bufio.NewReader(conn).ReadString('\n')
    fmt.Print("Message from server: "+message)
  }
}