XTU J6 Doorbell

Hi community !
I found the price of the XTU J6 doorbell quite good on Amazon. And the comments seems very good.
The J5 version is said compatible with ONVIF through RSTP protocol.
However no clue on the J6. And, as I need a on-battery doorbell, J5 is not an option.

Anyone had success with linking a XTU J6 to home assistant ?