Hi All
I just got my SMLIGHT SLZB-06
And I am following the guide at:
But when I want to add the OTB I am asked for an URL?
Can anyone help me get the installation done 
If you are using HAOS based installation, have you installed the OTBR AddOn?
The error you are showing is when the OTBR “Integration” is not discovering the OTBR AddOn.
I found the solution, the link was:
http://core-openthread-border-router:8081
And it works now
And Yes I had the OTBR integration installed.
And I still got the error when adding the addon following the guide