Help adding support for Ariston Rem4 Heater

[TheoLeCalvar]

I found a new zigbee enabled gateway for my Chaffoteaux (same group a Ariston) boiler.
However the device is not supported and the default configuration is empty.

const m = require('zigbee-herdsman-converters/lib/modernExtend');

const definition = {
    zigbeeModel: ['Rem4 Heater'],
    model: 'Rem4 Heater',
    vendor: 'Ariston',
    description: 'Automatically generated definition',
    extend: [m.battery()],
    meta: {},
};

module.exports = definition;

Here are the clusters I see on the web interface:

From these it looks like this device is going to be harder to configure than the examples I found in the documentation.
I found the device on the zigbee alliance website: here

Do you have advice on how to proceed in such case ?

---

I'm a bit confused by the fact that there is no hvac cluster (0x201) on the web view.
After reading the certification document I understand that it should have the following clusters:

• basic (0x000)
• identify (0x003)
• OnOff (0x006)
• OTA (0x019)
• hvac (0x201

So I tried using quirkAddEndpointCluster method to add these endpoint with no luck, the device always respond with UNSUPPORTED_ATTRIBUTE

I'm also not sure how to read the specification files because item M3.0 indicate that device should have attribut 0x000 for cluster 0x201 on endpoint 2 (pixit M5.0) and not endpoint 232 🤔