Device_class search template

Configuration
2

You need to limit it to just entities with a defined device_class:

    {{ states.binary_sensor
    | selectattr('attributes.device_class', 'defined')
    | selectattr('attributes.device_class', 'eq', 'window') 
    | selectattr('state', 'search', 'off') 
    | rejectattr('object_id', 'search', 'battery') 
    | list | count }}
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