async Task <Guid> subscribeToEventWithUrlAsync(string url, ParticleEventHandler handler, string eventNamePrefix)
{
var guid = Guid.NewGuid();
var source = new EventSource(url, ParticleCloud.AccessToken.Token, eventNamePrefix);
source.AddEventListener(guid.ToString(), handler);
await Task.Factory.StartNew(() => source.StartHandlingEvents().ConfigureAwait(false), TaskCreationOptions.LongRunning);
ParticleCloud.SharedInstance.SubscibedEvents.Add(guid, source);
return(guid);
}