sub-directory

hello everyone and happy new year
I would need some help about this:
in 'Views / automation' I have added the 'domotic_protocol' directory.
when with this command:
<? php echo base_url ('automation / domotic_protocol / bluetooth')?> "I recall the page I have a white error screen with the message:
404-not found / domotic_protocol
but on the bar it says:
http: // localhost / ci4_first / public / automation / domotic_protocol / bluetooth

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this is in routes

$ routes-> get ('index', 'Automation :: index');
$ routes-> get ('automation / (: any)', 'Automation :: show_automation / $ 1');

please tell me where the mistake is
thanks