1,You have to apply a telegram bot@BotFather
2,You will get your chat id and token to access the http api
curl -k --data chat_id="chat id" --data "text=This is a test message" "https://api.telegram.org/bot:<Your bot token>/sendMessage"
3,install vnstat and vnstati and config it.
apt install vnstat vnstati
config default ethernet number
nano /etc/vnstat.conf (normally it is eth0)
4,Create a script and make it run everyday.
touch /path/to/vnstattotg.sh
nano /path/to/vnstattotg.sh
copy and paste below:
(title="*`hostname` - Everyday traffic usage*"
vnstati -s -o <path to today.png>
curl -X POST \
-H "Content-Type: application/json" \
-d "{\"chat_id\": \"<Your chat id>\", \"text\": \"${title}\", \"parse_mode\": \"Markdown\"}" \
https://api.telegram.org/bot<Your bot token>/sendMessage
curl -F "chat_id=<Your chat id>" \
-F "caption=\"Everyday traffic usage\"" \
-F "photo=@/<path to today.png>" \
https://api.telegram.org/bot<Your bot token>/sendPhoto)
Give it a correct permission
chmod +x /path/to/vnstattotg.sh
crontab -e
0 0 * * * /bin/bash /path/to/vnstattotg.sh (run everyday at 00:00)
Enjoy!
