Hello.
A year ago I bought a house that had a central heating furnace with a KIPI burner fitted and an ecoMAX 850P2 - C furnace controller. There was a TP-Link router hanging on the cable (original cable) at the controller, but without any Plum markings, so that I don't know if it is the econet 300 original or a regular TP-Link. The login and password for the ecoMax controller was the factory one, ie admin, admin, so I set up my wi-fi and was able to log into the controller locally inside the network. I installed the Plum econet 24 app on my phone but also had a problem such that my device had a locked status. I tried calling Plum and sending emails because I wanted a working device, but without any response from the manufacturer, either by phone or email. Pissed off at Plum, I decided to somehow read the transmission myself, after all I could access the controller via http locally, as I wanted to integrate the ecoMAX 850 into the HA I was installing for myself at home. And I succeeded, I have integrated the furnace controller locally via wi-fi with Home Adjutant and I was able to view the data in real time and control the furnace from the HA locally without internet and without the manufacturer's app, a fantastic thing. But one day the TP-Link died and now I was left with a choice, buy a new econet 300 for £800 or control the appliance by connecting to the RS485 bus. I already have an ESP 32 connected via a Max485 converter to an ecoMAX 850 and I can see some frames, but it's completely different to what I had before and I can see the huge amount of work ahead of me to read what I see on the rs485 bus to restore integration with the HA.
I would very much appreciate any help to shorten my work. Maybe someone has read frames from the rs485.
I for my part can help integrate ecoMAX - with HA, I will show how I solved it. My integration showed all the parameters of the burner, CH, DHW temperature, mixer, feeder, fuel consumption, blower operation, flame sensor, pump operation, everything Plum provides. In addition, I was able to control the furnace, i.e. switch the controller on/off, set the desired temperature of the CH, DHW, mixer and all this locally without the manufacturer's cloud. I'm uploading a couple of pics of what it looks like at my place.