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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.
@Ollie
To do this you need your phone to be advertising a service. If you have iPhone you can use the NRF Connect app to set up a service - any will do - but name it something you can pick out. Once advertising you will see the phone (or more correctly the service) name and be able to pick up the RSSI (signal strength) as part of the advertised data. I don't know about Android, unless this is built in you will need a similar app.