one simple connection client-server sending strings, works

client/main.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"net"
+	"os"
+)
+
+func main() { //client https://systembash.com/a-simple-go-tcp-server-and-tcp-client/
+
+	// connect to this socket
+	conn, _ := net.Dial("tcp", "127.0.0.1:3333")
+	hostname, err := os.Hostname()
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	fmt.Println("connecting to server as hostname:", hostname)
+	ip := getIp()
+	fmt.Println("local ip:", ip)
+	// send to socket
+	fmt.Fprintf(conn, hostname+", ip: "+ip.String()+"\n")
+	for {
+		message, err := bufio.NewReader(conn).ReadString('\n')
+		if err != nil {
+			fmt.Println(err)
+			fmt.Println("server disconnected")
+			os.Exit(1)
+		}
+		fmt.Print("Command from server: " + message)
+	}
+
+}
+
+func getIp() net.IP {
+	var ip net.IP
+	ifaces, err := net.Interfaces()
+	if err != nil {
+		fmt.Println(err)
+	}
+	for _, i := range ifaces {
+		addrs, err := i.Addrs()
+		if err != nil {
+			fmt.Println(err)
+		}
+		for _, addr := range addrs {
+
+			switch v := addr.(type) {
+			case *net.IPNet:
+				ip = v.IP
+			case *net.IPAddr:
+				ip = v.IP
+			}
+			// process IP address
+		}
+	}
+	return ip
+}

server/main.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"net"
+	"os"
+)
+
+const (
+	CONN_HOST = "localhost"
+	CONN_PORT = "3333"
+	CONN_TYPE = "tcp"
+)
+
+func main() { //server
+
+	fmt.Println("Launching server...")
+
+	// listen on all interfaces
+	ln, err := net.Listen(CONN_TYPE, CONN_HOST+":"+CONN_PORT)
+	if err != nil {
+		fmt.Println("Error listening:", err.Error())
+		os.Exit(1)
+	}
+
+	// Close the listener when the application closes.
+	defer ln.Close()
+	defer fmt.Println("ended")
+
+	fmt.Println("Listening on " + CONN_HOST + ":" + CONN_PORT)
+
+	// accept connection on port
+	c, err := ln.Accept()
+	if err != nil {
+		fmt.Println("Error accepting: ", err.Error())
+		os.Exit(1)
+	}
+	// will listen for message to process ending in newline (\n)
+	message, _ := bufio.NewReader(c).ReadString('\n')
+	// output message received
+	fmt.Print("client connected:", string(message), "\n")
+	for {
+		/*// will listen for message to process ending in newline (\n)
+		message, _ := bufio.NewReader(c).ReadString('\n')
+		// output message received
+		fmt.Print("client connected:", string(message), "\n")*/
+
+		newcommand := bufio.NewReader(os.Stdin)
+		fmt.Print("command to send to the clients: ")
+		text, _ := newcommand.ReadString('\n')
+		// send new string back to client
+		c.Write([]byte(text + "\n"))
+	}
+}