Integrate alarm web page in HA / HomeSeer 3

Hello there,
I’ve an alarm system that it’s reachable via web GUI on the local network/VLAN.
Looking around I found out that this is some kind of port of HOMESEER 3 (“HS3 CLIENT APP”) but I haven’t been able to use the integration available on HACS ( marthoc/homeseer: HomeSeer Custom Integration for Home Assistant ( ) since I don’t have a password but only alarm PINs.
Anyway, I was looking for a way to scrape the web page (possibly javascript app) and to read values or execute “clicks”, in order to replicate the same behaviour of using a browser web, but via Home Assistant.
I don’t have any clue on how to begin!
Someone already did projects like this?