adding in main logic for ping pong

client/main.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	"fmt"
+	"net"
+	"time"
+)
+
+func main() {
+	serverAddr := "72.194.77.242:5000" // Change this to your server's address and port
+	// Create a UDP address structure to resolve the server address
+	serverUdpAddr, err := net.ResolveUDPAddr("udp", serverAddr)
+	if err != nil {
+		fmt.Println("Error resolving address:", err)
+		panic(err)
+	}
+
+	localAddr, err := net.ResolveUDPAddr("udp", "0.0.0.0:5001")
+	if err != nil {
+		fmt.Println("Error resolving address:", err)
+		panic(err)
+	}
+
+	// Create a UDP connection
+	conn, err := net.ListenUDP("udp", localAddr)
+	if err != nil {
+		fmt.Println("Error creating UDP connection:", err)
+		panic(err)
+	}
+	defer conn.Close()
+
+	go func() {
+		fmt.Println("CLIENT | listening on", conn.LocalAddr())
+
+		for {
+			// read
+			buf := make([]byte, 512)
+			n, addr, err := conn.ReadFromUDP(buf)
+			if err != nil {
+				panic(err)
+			}
+
+			fmt.Println("CLIENT | received message from ", addr.IP, ":", addr.Port, " with n: ", n)
+		}
+	}()
+
+	// Message to send
+	message := []byte("Hello server, I am the client!")
+
+	go func() {
+		for {
+			// write
+			_, err = conn.WriteToUDP(message, serverUdpAddr)
+			if err != nil {
+				panic(err)
+			}
+
+			// sleep for 5 seconds
+			time.Sleep(5 * time.Second)
+		}
+	}()
+
+	// wait
+	select {}
+}

go.mod

@@ -0,0 +1,3 @@
+module github.com/talksik/udp-ping-pong
+
+go 1.21.1

server/main.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"fmt"
+	"net"
+)
+
+func main() {
+	// udp listen
+	conn, err := net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4(0, 0, 0, 0), Port: 5000})
+	if err != nil {
+		panic(err)
+	}
+
+	for {
+		// read
+		buf := make([]byte, 512)
+		n, addr, err := conn.ReadFromUDP(buf)
+		if err != nil {
+			panic(err)
+		}
+
+		fmt.Println("SERVER | received message from ", addr)
+
+		// write
+		_, err = conn.WriteToUDP(buf[:n], addr)
+
+		if err != nil {
+			panic(err)
+		}
+	}
+
+}