fix: handle discv5 udp port 0 (#1069)

waku/v2/discv5/discover.go

@@ -178,6 +178,7 @@ func (d *DiscoveryV5) listen(ctx context.Context) error {
 
 	}
 
+	d.params.udpPort = uint(d.udpAddr.Port)
 	d.localnode.SetFallbackUDP(d.udpAddr.Port)
 
 	listener, err := discover.ListenV5(conn, d.localnode, d.config)

waku/v2/protocol/enr/localnode.go

@@ -79,6 +79,10 @@ func WithIP(ipAddr *net.TCPAddr) ENROption {
 
 func WithUDPPort(udpPort uint) ENROption {
 	return func(localnode *enode.LocalNode) (err error) {
+		if udpPort == 0 {
+			return nil
+		}
+
 		if udpPort > math.MaxUint16 {
 			return errors.New("invalid udp port number")
 		}

waku/v2/protocol/metadata/waku_metadata_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"crypto/rand"
 	"errors"
+	"strings"
 	"testing"
 	"time"
 
@@ -50,6 +51,10 @@ func isProtocolNotSupported(err error) bool {
 	return errors.Is(err, notSupportedErr)
 }
 
+func isStreamReset(err error) bool {
+	return strings.Contains(err.Error(), "stream reset")
+}
+
 func TestWakuMetadataRequest(t *testing.T) {
 	testShard16 := uint16(16)
 
@@ -84,7 +89,7 @@ func TestWakuMetadataRequest(t *testing.T) {
 
 	// Query a peer not subscribed to any shard
 	_, err = m16_1.Request(context.Background(), m_noRS.h.ID())
-	require.True(t, isProtocolNotSupported(err))
+	require.True(t, isProtocolNotSupported(err) || isStreamReset(err))
 }
 
 func TestNoNetwork(t *testing.T) {