dispatchEnvelope method
Implementation
@override
void dispatchEnvelope({
  required String topic,
  required String envelope,
}) async {
  core.logger.d(
    '[$runtimeType] dispatchEnvelope, topic: $topic, envelope: $envelope',
  );
  final message = Uri.decodeComponent(envelope);
  await core.relayClient.handleLinkModeMessage(topic, message);
}