Get server token

.gitignore

@@ -0,0 +1 @@
+teeworlds_client

README.md

@@ -1,2 +1,3 @@
 # teeworlds_client
+
 Me playing around

go.mod

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+module github.com/ChillerDragon/teeworlds_client
+
+go 1.22.3

teeworlds_client.go

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+package main
+
+import (
+	"bufio"
+	"fmt"
+	"net"
+	"slices"
+	"time"
+)
+
+const (
+	maxPacksize  = 1400
+	msgCtrlToken = 0x04
+)
+
+func ctrlToken(myToken []byte) []byte {
+	header := []byte{0x04, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff}
+	ctrlToken := append([]byte{0x05}, myToken...)
+	zeros := []byte{512: 0}
+	data := slices.Concat(header, ctrlToken, zeros)
+	return data
+}
+
+func pumpNetwork(ch chan []byte) {
+	packet := make([]byte, maxPacksize)
+	conn, err := net.Dial("udp", "127.0.0.1:8303")
+	if err != nil {
+		fmt.Printf("Some error %v", err)
+		return
+	}
+
+	// myToken := []byte{0xfe, 0xed, 0xba, 0xbe}
+	myToken := []byte{0x01, 0x02, 0x03, 0x04}
+	conn.Write(ctrlToken(myToken))
+
+	for {
+		_, err = bufio.NewReader(conn).Read(packet)
+		if err == nil {
+			ch <- packet
+		} else {
+			fmt.Printf("Some error %v\n", err)
+			break
+		}
+	}
+
+	conn.Close()
+}
+
+func onMessage(data []byte) {
+	if data[0] == msgCtrlToken {
+		serverToken := data[8:12]
+		fmt.Printf("got token %v\n", serverToken)
+	} else {
+		fmt.Println("unknown message")
+	}
+}
+
+func main() {
+	ch := make(chan []byte, maxPacksize)
+
+	go pumpNetwork(ch)
+
+	for {
+		time.Sleep(10_000_000)
+		select {
+		case msg := <-ch:
+			onMessage(msg)
+		default:
+			// do nothing
+		}
+	}
+
+}