Download install.sh on your Pi device and execute it with shell.
In case in error try set execution rights: sudo chmod +x install.sh.

Download secure_phrase.sh on your Pi device and execute it with shell 'sudo bash secure_phrase.sh your_secret'.
In case in error try set execution rights: sudo chmod +x install.sh.

Use find_pi.sh script to find Pi device by mac address 

wscat -c ws:https://localhost:3000

journalctl
last reboot | less
last -x | grep shutdown | less
/var/log/syslog