1.On the github project pagehttps://github.com/dkarv/hacs-bwt-perla, click on the image inviting you to add the project on your HA.
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In Settings/devices services. Click on the Add integration on bottom right. Search for BWT.
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There you should enter IP or hostname of your device. The user code will be find in your email you received when you registered your device. Looks like this “zdoenlo”
Tim