but how do I get this data ?
What data? The number like 0x180f? Check out the link to the Bluetooth SIG in http://www.espruino.com/About+Bluetooth+LE#uuids
why is it? can I change the MAC of the device ?
Each device has its own MAC address - that's how it works, like Ethernet/WiFi/etc.
You can change it with NRF.setAddress but it's not recommended.
NRF.setAddress
@Gordon started
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.
What data? The number like 0x180f? Check out the link to the Bluetooth SIG in http://www.espruino.com/About+Bluetooth+LE#uuids
Each device has its own MAC address - that's how it works, like Ethernet/WiFi/etc.
You can change it with
NRF.setAddress
but it's not recommended.