@Lipas, the Satel Perfecta is completely a different animal. The Perfecta is a modern system with internet connection and mobile application. It is not the old setup like the CA-6 and CA-10.
But just quickly looking at the programming manual, it supports SIA alarm stations with the GPRS/4G module. (I have not looked at the IP version, and you have not stated that which version you actually have.) And SIA is offcially supported by Home Assistant:
I can imagine that the Perfecta can be programmed to report to the SIA station through the internet, which is running in HA, likely the IP version can do it locally.
Or you can have a look at this video:
There are links in the description where the author hacked together a system with SMS communication.
Also, a working solution could be if an output expansion module is connected to the alarm module and it repeats to an ESP device the inputs of the alarm, like @macek implied it.
And just a final thought, it is likely you can get more information out of the system on the keypad bus, but it is not documented by SATEL, and likely complicated, but should be bus communication.
For developing anything on the keypad bus, I would get a full system on a bench with a programmer, and would connect an ESP device as a “keypad”. (Bus communication has addresses, so likely need to program it into the system to receive/transmit anything.)
I built my CA-6 integration in a few days time, as a proof of concept, on a “live” system, without a programmer or knowing how exactly the alarm module was programmed. It started as an idea, like what if I can imitate the LEDs on the control panel, and started to look at images on the internet what are the electrical components of the keypad, and figured out that the it is just simple bit-banging without any encryption or anything.
I could develop further with a bench system, but still not get my hand on one, despite one without a keypad is 129 PLN on Allegro.
Doing the same with a Perfecta, that would be a bit more of an investment, so it is better to talk with somebody who installs and programs these alarm modules.
And just a note on installers as my experience. There are many people who just installs them and not interested about them at all. When I went through my alarm system, I had to recognise that the wiring is just a huge mess. Even it is an old alarm system, it support EOL (End Of Line) resistors. Meaning, that with a sensor connected there should be a fixed resistance on the line when it is connected. This way the system know that there is no tampering with the sensor, the cable has not been cut and/or shorted. These resistors should be installed as the name suggest, at the end of the line, so at the sensor, inside the sensor housing. What I have found was that all the resistors are connected to the wires at the alarm module, meaning the whole concept is not working and the sensor can be tampered with. This is a direct result of a lazy and/or uneducated installer. So, you might find somebody, who installs them, but has no clue about what he is actually doing.
Also, tagging @Integer, because he has asked about Perfecta integration recently. Maybe will be interested to cooperate and find a working solution together.