private void session_StateChanged(object sender, SessionListenerEventArgs e)
{
Log.Spew("session_StateChanged:\n\tfrom " + e.OldState + "\n\tto " + e.NewState);
var justConnected = e.NewState.Connected && !e.OldState.Connected;
var justDisconnected = !e.NewState.Connected && e.OldState.Connected;
if (justConnected)
topicManager = new TopicManager(e.Session, directInputManager, car, refreshIntervalManager, metrics);
if (justDisconnected)
topicManager = null;
}