(I've been looking through a few related posts in m2m's forum as well as m2m2's config options but couldn't find an answer; sorry if I've overlooked)
I'm wondering how the following setup can be done:
- have a rather long data source update period - say 5 minutes - used for standard logging/monitoring purposes. That way we lower resources - CPU, DB size, traffic, PLC device usage, ...
- have a much shorter update period when someone is interacting with graphics (either through graphicalViews or jspViews).
It seems it's possible as an old post  shows, but I can't figure what config/module is needed.
Otherwise, is there for instance a way to initiate a data "refresh" at fixed intervals in a jsp script ? (might be dangerous if there's no global "limit" mechanism, as there will be a potential for DDoS if many views are open).
On a slightly related topic, I fail to understand how "Discard data delay (ms)" relate to the update period in the modbus module; any pointer ?