resume method

Implementation

void resume() {
  final pingInterval = _pingInterval;
  if (pingInterval != null) {
    if (!(pingTimer?.isActive ?? false)) {
      pingTimer = Timer.periodic(pingInterval, (_) {
        _ping();
      });
    }
  }
  if (!dequeueTimer.isActive) {
    dequeueTimer = Timer.periodic(_dispatchSettings.dequeueInterval, (timer) {
      _dequeue();
    });
  }
}