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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
I haven't used SIM5230, but if it supports communication like the SIM900 then yes, it should work.
It all depends on the available RAM though - are you using the Espruino Pico? If so you should be fine (as long as the certificates are in ROM). If you're doing some custom solution it depends what you use - but if you want me to help with that you'll have to pay consultancy... I can't afford to design your product for you for free :)