[feature] Add a small command line referee client for testing

Author: g3force

cmd/ssl-ref-client/main.go

@@ -0,0 +1,52 @@
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"github.com/RoboCup-SSL/ssl-game-controller/pkg/refproto"
+	"github.com/golang/protobuf/proto"
+	"log"
+	"net"
+	"time"
+)
+
+const maxDatagramSize = 8192
+
+var refereeAddress = flag.String("address", "224.5.23.1:10003", "The multicast address of ssl-game-controller, default: 224.5.23.1:10003")
+
+func main() {
+	flag.Parse()
+
+	addr, err := net.ResolveUDPAddr("udp", *refereeAddress)
+	if err != nil {
+		log.Fatal(err)
+	}
+	conn, err := net.ListenMulticastUDP("udp", nil, addr)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	conn.SetReadBuffer(maxDatagramSize)
+	log.Println("Receiving from", *refereeAddress)
+
+	b := make([]byte, maxDatagramSize)
+	for {
+		n, err := conn.Read(b)
+		if err != nil {
+			log.Print("Could not read", err)
+			time.Sleep(1 * time.Second)
+			continue
+		}
+		if n >= maxDatagramSize {
+			log.Fatal("Buffer size too small")
+		}
+		refMsg := refproto.Referee{}
+		proto.Unmarshal(b, &refMsg)
+
+		b, err := json.Marshal(refMsg)
+		if err != nil {
+			log.Fatal(err)
+		}
+		log.Print(string(b))
+	}
+}

internal/app/controller/publisher.go

@@ -28,7 +28,7 @@ func NewPublisher(address string) (publisher Publisher, err error) {
 		return
 	}
 
-	conn.SetReadBuffer(maxDatagramSize)
+	conn.SetWriteBuffer(maxDatagramSize)
 	log.Println("Publishing to", address)
 
 	publisher.conn = conn