force transport policy to relay

group/group.go

@@ -56,6 +56,7 @@ func IceConfiguration() webrtc.Configuration {
 		}
 		iceConf = webrtc.Configuration{
 			ICEServers: iceServers,
+			ICETransportPolicy: webrtc.ICETransportPolicyRelay,
 		}
 	})
 

static/protocol.js

@@ -387,6 +387,7 @@ ServerConnection.prototype.newUpStream = function(id) {
     }
     let pc = new RTCPeerConnection({
         iceServers: sc.iceServers || [],
+        iceTransportPolicy: 'relay',
     });
     if(!pc)
         throw new Error("Couldn't create peer connection");
@@ -495,6 +496,7 @@ ServerConnection.prototype.gotOffer = async function(id, labels, offer, renegoti
     if(!c) {
         let pc = new RTCPeerConnection({
             iceServers: this.iceServers,
+            iceTransportPolicy: 'relay',
         });
         c = new Stream(this, id, pc);
         sc.down[id] = c;