I'd recommend SignalR as it is a better solution in terms of performance and efficiency.
There seems to be an issue with the current version of the Chart MVC wrappers with regards to the SignalR data source configuration.
It will actually work for reading data, but the update/delete/create methods are not configurable.
We're looking into this and we'll try to provide support for live updates in the short term.
For the moment I've prepared a JS version
as a proof of concept.
Apologies for the caused inconvenience.
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