ICE connection fails in Firefox

[infojunkie]

Trying to run your distributed metronome demo https://github.com/chrisguttandin/web-audio-metronome-demo in Firefox, I get the following error, repeated thousands of times:

WebRTC: ICE failed, add a TURN server and see about:webrtc for more details

Since it's the Timing Provider that establishes the connection, I thought I'd ask you for your advice before I jump in the code :-D

[infojunkie]

After reading the related Firefox bug https://bugzilla.mozilla.org/show_bug.cgi?id=1659672, I switched from using http://localhost to the actual machine IP, and now WebRTC no longer complains, but I get this error:

Firefox can’t establish a connection to the server at wss://matchmaker.suenc.io/?providerId=OBFUSCATED.

Looks like a CORS issue, but is it on the local side or the Suenc side?

GET
wss://matchmaker.suenc.io/?providerId=OBFUSCATED
NS_ERROR_WEBSOCKET_CONNECTION_REFUSED

./node_modules/timing-provider/build/es2019/module.js/timingProviderConstructor<
module.js:18:128
./node_modules/timing-provider/build/es2019/factories/signaling-factory.js/createSignalingFactory/<
signaling-factory.js:5
./node_modules/timing-provider/build/es2019/factories/timing-provider-constructor.js/createTimingProviderConstructor/_createClient/this._subscription<
timing-provider-constructor.js:145
./node_modules/rxjs/dist/esm5/internal/observable/defer.js/defer/<
defer.js:5:17
./node_modules/rxjs/dist/esm5/internal/Observable.js/Observable.prototype._trySubscribe
Observable.js:38
./node_modules/rxjs/dist/esm5/internal/Observable.js/Observable.prototype.subscribe/<
Observable.js:32
errorContext
errorContext.js:19
./node_modules/rxjs/dist/esm5/internal/Observable.js/Observable.prototype.subscribe
Observable.js:23:20
doInnerSub
mergeInternals.js:19:17
outerNext
mergeInternals.js:14:39
./node_modules/rxjs/dist/esm5/internal/operators/OperatorSubscriber.js/OperatorSubscriber/_this._next<
OperatorSubscriber.js:15
./node_modules/rxjs/dist/esm5/internal/Subscriber.js/Subscriber.prototype.next
Subscriber.js:34
./node_modules/rxjs/dist/esm5/internal/observable/innerFrom.js/fromArrayLike/<
innerFrom.js:51
./node_modules/rxjs/dist/esm5/internal/Observable.js/Observable.prototype._trySubscribe
Observable.js:38
./node_modules/rxjs/dist/esm5/internal/Observable.js/Observable.prototype.subscribe/<
Observable.js:32
errorContext
errorContext.js:19
./node_modules/rxjs/dist/esm5/internal/Observable.js/Observable.prototype.subscribe
Observable.js:23:20
mergeInternals
mergeInternals.js:53
./node_modules/rxjs/dist/esm5/internal/operators/mergeMap.js/mergeMap/<
mergeMap.js:14:72
./node_modules/rxjs/dist/esm5/internal/util/lift.js/operate/</<
lift.js:10
./node_modules/rxjs/dist/esm5/internal/Observable.js/Observable.prototype.subscribe/<
Observable.js:27
errorContext
errorContext.js:19
./node_modules/rxjs/dist/esm5/internal/Observable.js/Observable.prototype.subscribe
Observable.js:23:20
subscribeForRetry
retry.js:25
resub_1
retry.js:36
./node_modules/rxjs/dist/esm5/internal/operators/retry.js/retry/</subscribeForRetry/innerSub</notifierSubscriber_1<
retry.js:46
./node_modules/rxjs/dist/esm5/internal/operators/OperatorSubscriber.js/OperatorSubscriber/_this._next<
OperatorSubscriber.js:15
./node_modules/rxjs/dist/esm5/internal/Subscriber.js/Subscriber.prototype.next
Subscriber.js:34
./node_modules/rxjs/dist/esm5/internal/observable/timer.js/timer/</<
timer.js:25
./node_modules/rxjs/dist/esm5/internal/scheduler/AsyncAction.js/AsyncAction.prototype._execute
AsyncAction.js:62
./node_modules/rxjs/dist/esm5/internal/scheduler/AsyncAction.js/AsyncAction.prototype.execute
AsyncAction.js:50
./node_modules/rxjs/dist/esm5/internal/scheduler/AsyncScheduler.js/AsyncScheduler.prototype.flush
AsyncScheduler.js:21