start method
Implementation
Future<void> start() async {
rtcPeerConnection =
await createPeerConnection(configuration, loopbackConstraints);
rtcPeerConnection!.addStream(localStream!);
rtcPeerConnection!.onAddStream = _onAddStream;
rtcPeerConnection!.onRemoveStream = _onRemoveStream;
rtcPeerConnection!.onRenegotiationNeeded = _onRenegotiationNeeded;
rtcPeerConnection!.onIceCandidate = _onIceCandidate;
await renderer.initialize();
emit('connected');
}