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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
So you'd like to verify the identity of the GPS module itself? Or of Espruino?
If it's Espruino itself then you can actually check
getSerial()- which is a laser-etched unique per-chip serial number. If you really want to lock things down you could use that number to decrypt your source code at boot time - so it'd be quite difficult to reverse engineer.For the GPS I guess it depends if you have any control over the GPS module itself. If it's an off the shelf module then you'll be quite limited - you might be able to find a manufacturer specific command that returns a unique ID for the module though (or EEPROM as you say) - but anyone snooping on the connection could then figure out what was in the EEPROM and write the same thing to their module.
If you have your own microprocessor on the module then you've got a bit more control. You could for instance send some random text to the module, have the module encrypt that text somehow with its own key, and then compare that returned code on the host. It's quite a lot of effort to go to though!