IP Changed Telegram Message
Send a Telegram message when the public IP address changes
(Yes, I know, the IPv6 address is the one from the device, not from your network.)
In order to find the public ip address out https://ipv4.edjopato.de and https://ipv6.edjopato.de are used.
Needs BOT_TOKEN and TARGET_CHAT (chat_id) environment variables set in order to work.