sfu node always pick ice controlled role(lite) (#322)

* sfu node always pick ice controlled role(lite)

* fix test case

Co-authored-by: cnderrauber <zengjie9004@gmail.com>

pkg/rtc/config.go

@@ -62,6 +62,7 @@ func NewWebRTCConfig(conf *config.Config, externalIP string) (*WebRTCConfig, err
 	s := webrtc.SettingEngine{
 		LoggerFactory: serverlogger.LoggerFactory(),
 	}
+	s.SetLite(true)
 
 	if externalIP != "" {
 		s.SetNAT1To1IPs([]string{externalIP}, webrtc.ICECandidateTypeHost)

test/client/client.go

@@ -126,6 +126,8 @@ func NewRTCClient(conn *websocket.Conn) (*RTCClient, error) {
 	conf := rtc.WebRTCConfig{
 		Configuration: rtcConf,
 	}
+	conf.SettingEngine.SetLite(false)
+	conf.SettingEngine.SetAnsweringDTLSRole(webrtc.DTLSRoleClient)
 	codecs := []*livekit.Codec{
 		{
 			Mime: "audio/opus",