When you cant get fourheat module with HA to work, somewhere above are comprehensive instructions how to connect NG21 with esp module.
I did look at my papers for my own stove and noticed that for NG21 board switching between pellet and wood in ESPHome would be like this
select:
- id: combi
name: Combi Management
platform: fourheat
datapoint: B20379
options:
0: "Pellet"
1: "Wood"
2: "Wood-Pellet"
3: "Combi 1"
4: "Combi 2"
There is very little chance that for you board, it could be the same so I would not get hopes too high. If not - your only remaining option is to learn communication sniffing.
wOow thx very much
Tomorrow I try it
Ho provato ma i sensori tutti non disponibili, mi puoi indicare su quale porta collegare il modulo e se hai link di tutto quello che serve per collegare la wemos? Grazie
Ho sempre una scheda ng21 e se puoi anche mandarmi la configurazione di esphome. Grazie
I tried but it doesnât work
As I suspected it was a longshot, but when you are able to find out datapoint for your board it should go similarly.
Is anyone kind enough to rewrite the procedure for wemos on NG21? Thanks.
Your contact who gave you the NG21 datapoints, could he also give us the SY250/MB250 datapoints?
Your contact who gave you the NG21 datapoints, could he also give us the SY250/MB250 datapoints?
no 
i sent emails and called ti emme. but no answer. can anyone find the datapoints?
I noticed that sometimes I donât get any information from the logs. The log seems frozen until I restart the exp. Then I noticed some errors in the log in yellow
Good evening, I connected the module from rs232 to ttl all connected to rx and tx of a wemos d1 mini, I wrote the file in esp home it creates the sensors but they are all unknown, I canât understand why the stove doesnât communicate with me.
I have a tiemme ng21 card and I also installed the 4heat wifi module that works but even with your integration it doesnât find any entity.
I hope someone of you can help me. Thanks.