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Dan, I would go further and say simulation (of models) is an essential part of any ‘digital twin’. It provides a ‘virtual representation’ that many confuse with the DT itself, e.g. the BIM community.
The unsolved part of any digital twin is not the technology stack for secure synchronization – it’s the simulation itself. I say that based on us having cobbled together solutions based on HTTP, REST, and brute force C. We’ve also spoken with others who used MQTT and DDR successfully. I posed this to Catapult before the July Conference and got a tepid response to the ‘provocations’ is was asked to write. That resulted in me posting them here for others to see and mull.