Can send ice candidates to server

lib/ui/screens/call_screen.dart

@@ -168,6 +168,10 @@ class _CallScreenState extends SafeState<CallScreen> {
 
       _peersConnections[memberID] = peerConnection;
 
+      // Register callbacks
+      peerConnection.onIceCandidate =
+          (c) => CallsHelper.sendIceCandidate(convID, memberID, c);
+
       // Request an offer to establish a peer connection
       await CallsHelper.requestOffer(convID, memberID);
     } catch (e, stack) {