Firebase data change not getting grandchild

hello how to get this data on data change
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this is my blocks:
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thank you

Have you set project bucket as STATUS?

OR you can try with STATUS/MCU_01/

And get firebase with tag value as _alarm

is there a way where I can get all “_alarm” from these nodes?
each MCU has a child _alarm and I want to listen to that value across all MCU using data change

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Then you can try web component method to get alarm value from all id

can you please help me on how I can do that instead? a link or a guide will be appreciated. thank you!

Reference

Your url must be

https://your_firebase_project_id.firebaseio.com/STATUS/. json

does this listen to data change too? or only happens once?

You can use this url when firebase data got changed block

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