Hello,


I am going to use a raspberry PI for browsing on a TV, so I
          want to connect with a wireless keyboard,  bluetooth.


It looks like bluetooth is "not running";
[rocr@centos-rpi3 ~]$ systemctl status bluetooth.service

          ● bluetooth.service - Bluetooth service

             Loaded: loaded (/usr/lib/systemd/system/bluetooth.service;
          enabled; vendor preset: enabled)

             Active: inactive (dead)

               Docs: man:bluetoothd(8)

        
I don't have any bluetooth devices connected yet.   but the
          service should be up, right?
Is there a write-up, guide, to get bluetooth configured?
I'm not aware of any specific guide specific for arm/rpi, and I
      don't use bluetooth, but this guide for Fedora should be a good
      starting point
      https://fedoraproject.org/wiki/Documentation/Bluetooth


thanks,


Ron