Close UDPMux when exit (#1064)

* Close UDPMux when exit

* fix test failed

pkg/rtc/config.go

@@ -78,7 +78,7 @@ func NewWebRTCConfig(conf *config.Config, externalIP string) (*WebRTCConfig, err
 		rtcConf.PacketBufferSize = 500
 	}
 
-	var udpMux *ice.UDPMuxDefault
+	var udpMux ice.UDPMux
 	var udpMuxConn *net.UDPConn
 	var err error
 	networkTypes := make([]webrtc.NetworkType, 0, 4)

pkg/service/roommanager.go

@@ -196,6 +196,9 @@ func (r *RoomManager) Stop() {
 	}
 
 	if r.rtcConfig != nil {
+		if r.rtcConfig.UDPMux != nil {
+			_ = r.rtcConfig.UDPMux.Close()
+		}
 		if r.rtcConfig.UDPMuxConn != nil {
 			_ = r.rtcConfig.UDPMuxConn.Close()
 		}