in a customer application, we now had the need for retrieving history of sensor event streams - in a simple and light-weight way.
As we had this idea floating around for some time for WAMP in general, and Crossbar.io in partricular, I took the chance to actually write some code;)
So here yoou are: trunk now has basic support for event history.
Here is a complete example and description
Please try it out and let me know what you think! Any feedback welcome.