I'm kind of late to the party, but the final answer to the OP question came in just a few days ago.
Between heating and eating I chose... to cancel ADT subscription. At the time of the separation, ADT didn't offer any codes. Fully functional Visonic PowerMaster 360 professionally installed system became abandoned as a result primarily because of the inability to check it via the app remotely.
Many thanks to Visonic Powermax and Powermaster Integration for Home Assistant OSS project, it is possible to give Visonic PowerMaster 360 a second lease of life without paying for a rather expensive and totally useless subscription. As a byproduct, the following secret codes, not shared by ADT otherwise, can be extracted from Visonic Power Master 360 and a few other panels on the list:
User Codes
Master Code
Installer Code
Master Download Code
Installer Download Code
Raspberry Pi Zero (£12.59 inc. VAT and shipping) will do the one off code dumping job. It will require a quality micro USB cable, a phone charger with micro USB output and an ability to follow unwritten instructions.
NB Raspberry PI Zero doesn't have any network connectivity, so it will be useless for anything else. Although I have some positive experience of running Home Assistant on a sister SBC with 512 MB RAM and Wi-Fi (Zero 2W), Home Assistant hardware requirements are hugely and unreasonably inflated when it comes to RAM.
Well, the internet if full of opinions and alternative facts.
The panel is self contained. No cloud is required for it to operate.
By plugging Home Assistant via Visonic Powermax and Powermaster Integration into PowerLink subsystem via a micro USB connector at the back, the panel is getting an ability for integration with Apple HomeKit, or any other home automation controller either natively when supported, or via MQTT.
In addition, the GSM module inside the panel can be configured to send alerts via text messages. Apparently this will require a SIM on a paid contract. As a reminder, the GSM module is 2G/3G, and 3G will not exist in the UK beyond next year (with exception for so much lobbied smart meters, of course) and 2G will be switched off by 2033 at the latest.
