Hi jacare,
yes, it is. You can set the policy on the device to "ask user" before the remote access is enabled. This will trigger a request on the device before the access is granted. One can acknoledge this request on the webinterface of the ctrlX CORE, on a web-based HMI what integrates it via the data layer or with other logic e.g. as you describe it. It is up to you what setup you want. The connection can be cut on the device side any time. Individual user permissions can be set.
If you want to have a physical key switch of course you need to add and connect it to your setup.
Cheers
J
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