Button not linked to any item

[l1t7l3ph0o7]

If you need your items to retain its value even through a reboot, you will a persistance engine.
http://docs.openhab.org/configuration/persistence.html

Here is guide to setup mysql persistance (which I personally recomend)

openHAB2 & MySQL persistence setup

The following tutorial is an example how I got MySQL persistence working in my environment. Install “MySQL Persistence” via PaperUI Install and configure MySQL: sudo apt-get install mysql-server Here, it will ask for a root password, saying that “While it is not necessary, it is suggested.” Of which it is always a good idea to include a root password. Make sure, of course, to remember this password as well. Start the MySQL commandline as root sudo mysql -u root -p Create a database …

Edit: sorry didnt see this was already answered.