I left the phone (an old one) to the window to record the sounds.It recorded three knocks.
The quality is awful since it's not a smartphone but an old one with buttons,but at least it's something.Seems like when i turned my attention elsewhere,the noises started again.
The first at 10:26
The second at 12:28
The third one at 15:03
https://drive.google.com/file/d/1UNo...ew?usp=sharing