Electronic Badge — The 0r4cl3
The 0r4cl3 electronic badge runs on an ESP32 with WiFi module, and many other powerful stuff.
7 challenges, each bearing a magical flag, await you at http://badgectf.infosec19.jellykaya.com/.
Once you solved the flag for each challenge, submit the flag to the web application (http://ctf.local/) which can be assessed only via the WiFi-enabled badge.
The 0r4cl3 badge is fully hackable and open-sourced: https://github.com/jellyjellyrobot/0r4cl3