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openHAB 2 comes with a Telegram binding which allows to run a Telgram Bot. This bot can both send messages to users and groups, and can receive commands and respond to them. That's useful: your home automation system can send all kind of details to your mobile phone.

For this to make it work it needs a couple things:

First of all a mobile phone with the Telegram app on it. You can either have the bot message you directly, but this only works for one person. Or you create a group, and have the bot send the messages to the group instead. Find out about the group ID here.

Then you need to create a Telegram Bot. Instructions are available here.

And everything needs to be hooked up in openHAB.