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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Did you close the forum post on purpose? It would explain why nobody had replied.
I'm not sure there's a tutorial on using EspruinoHub for what you're attempting...
However it might help first to use an app like 'NRF Connect' on your phone to connect to the device in question and figure out exactly where the values you're interested in are?
If they are just advertised then you may be able to find that data in an MQTT advertising packet, without having to connect.