Anyone who knows how to get battery status of Android tablet

The ON command is passed as body of the POST http request, it is not part of the URL.

here is an generic example of a http post action with Tasker: https://www.triggercmd.com/forum/topic/35/trigger-commands-with-a-tasker-http-post-action

In your case here are the variables you need to set
Server:Port: https://openhabianpi.8080
Path: rest/items/BW4
Data/File: ON

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