Get MAC-Adress of Particle Device with Particle CLI - From https://community.particle.io/t/how-do-i-find-the-mac-address-on-a-particle-photon-with-a-mac-osx/15524
######Install latest version of Node.js
https://nodejs.org/en/download/
######Install the Particle CLI
npm install -g particle-cli
######Set Photon into listening mode
Hold Setup-Button for 5 Seconds (until LED blinks blue)
######Get Mac-Adress with following command
particle serial mac