From bd0471d2fe1a6f4fdf99e0aed4c7d0c889a76e1f Mon Sep 17 00:00:00 2001
From: Tamagoham <gleamfever797@hotmail.com>
Date: Tue, 16 Jul 2024 20:39:42 +0200
Subject: [PATCH] :warning: change multicast ttl

---
 go.mod                            |  5 ++++-
 go.sum                            |  2 ++
 internal/app/publish/publisher.go | 11 +++++++++--
 3 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/go.mod b/go.mod
index 9edc4fc1..d8e96345 100644
--- a/go.mod
+++ b/go.mod
@@ -11,4 +11,7 @@ require (
 	gopkg.in/yaml.v3 v3.0.1
 )
 
-require golang.org/x/net v0.23.0 // indirect
+require (
+	golang.org/x/net v0.23.0 // indirect
+	golang.org/x/sys v0.18.0 // indirect
+)
diff --git a/go.sum b/go.sum
index ae832906..2ea348d0 100644
--- a/go.sum
+++ b/go.sum
@@ -10,6 +10,8 @@ github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 golang.org/x/net v0.23.0 h1:7EYJ93RZ9vYSZAIb2x3lnuvqO5zneoD6IvWjuhfxjTs=
 golang.org/x/net v0.23.0/go.mod h1:JKghWKKOSdJwpW2GEx0Ja7fmaKnMsbu+MWVZTokSYmg=
+golang.org/x/sys v0.18.0 h1:DBdB3niSjOA/O0blCZBqDefyWNYveAYMNF1Wum0DYQ4=
+golang.org/x/sys v0.18.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/protobuf v1.33.0 h1:uNO2rsAINq/JlFpSdYEKIZ0uKD/R9cpdv0T+yoGwGmI=
diff --git a/internal/app/publish/publisher.go b/internal/app/publish/publisher.go
index 58ae9aab..39eb77d3 100644
--- a/internal/app/publish/publisher.go
+++ b/internal/app/publish/publisher.go
@@ -1,10 +1,12 @@
 package publish
 
 import (
-	"github.com/RoboCup-SSL/ssl-game-controller/internal/app/state"
-	"google.golang.org/protobuf/proto"
 	"log"
 	"net"
+
+	"github.com/RoboCup-SSL/ssl-game-controller/internal/app/state"
+	"golang.org/x/net/ipv4"
+	"google.golang.org/protobuf/proto"
 )
 
 const maxDatagramSize = 8192
@@ -51,6 +53,11 @@ func (p *Publisher) connect() bool {
 			log.Printf("Could not connect to '%v': %v", addr, err)
 			continue
 		}
+		conn2 := ipv4.NewPacketConn(conn)
+		err = conn2.SetMulticastTTL(32)
+		if err != nil {
+			log.Printf("Could not set TTL to 32: %v", err)
+		}
 
 		if err := conn.SetWriteBuffer(maxDatagramSize); err != nil {
 			log.Printf("Could not set write buffer to %v.", maxDatagramSize)