On Thursday, 8 April 2021 15:43:30 CEST giuseppedv@gmail.com wrote:
>     batctl if
>     wlan0: <error reading status>
>
> Anyone experienced the same issues?

Make sure you've updated batctl to the most recent version. For example from 
Debian backports. Otherwise batctl might try to read the status information 
from sysfs - which is no longer supported by the newest batman-adv releases.

Kind regards,
	Sven