Refactor RTC configuration to use 'all' iceTransportPolicy, reintroduce STUN server URLs, and remove credentialed TURN server handling.

www/js/main.js

@@ -14,10 +14,13 @@
 
 const $self = {
   rtcConfig: {
-    iceTransportPolicy: 'relay', // TURN only
+    // WebRTC has no "STUN-only" transport policy. Using `all` with only
+    // STUN servers configured allows host and server-reflexive candidates,
+    // while ensuring that no TURN relay candidate can be created.
+    iceTransportPolicy: 'all',
     iceServers: [
-      // { urls: 'stun:stun.l.google.com:19302' },
-      // { urls: 'stun:stun1.l.google.com:19302' },
+      { urls: 'stun:stun.l.google.com:19302' },
+      { urls: 'stun:stun1.l.google.com:19302' },
     ],
   },
   mediaConstraints: { audio: true, video: true },
@@ -626,13 +629,10 @@ function handleScConnect() {
   console.log(`Self ID: ${$self.id}`);
 }
 
-function handleScConnectedPeers({ peers, credentials }) {
+function handleScConnectedPeers({ peers }) {
   const ids = peers;
   console.log(`Connected peer IDs: ${ids.join(', ')}`);
 
-  console.log(`TURN Credentials: ${JSON.stringify(credentials)}`);
-  addCredentialedTurnServer('turn:182.92.86.220:3478', credentials);
-
   for (let id of ids) {
     if (id === $self.id) continue;
     // be polite with already-connected peers
@@ -736,15 +736,6 @@ async function handleScSignal({ sender,
  *  Utility Functions
  */
 
-function addCredentialedTurnServer(server_string, { username, password }) {
-  // Add TURN server and credentials to iceServers array
-  $self.rtcConfig.iceServers.push({
-    urls: server_string,
-    username: username,
-    credential: password,
-  });
-}
-
 function prepareNamespace(hash, set_location) {
   let ns = hash.replace(/^#/, ''); // remove # from the hash
   if (/^[a-z]{4}-[a-z]{4}-[a-z]{4}$/.test(ns)) {