Let me know if you do as i would love some debug output from your CN105 
@F1p if you can send me instructions I might be able to grab some debug data whilst I’m working on the Ecodan over the next few days.
PM with your Thermistor readings at the same time as a Telnet export world be excellent please.
Hello @gekkekoe I’m using your project which is just fantastic.
My wifi connection is poor where the machine is located and got many disconnection.
Bought a Wemod D1 mini pro with external wifi antenna which should solve the issue by gaining some db.
How can I adapt to ESP8266 your project?
Or do you have any other tips to make it work?
Many thanks
@samumar82 It was too much work for me to make it work on ESP8266 (will have to redo threads and stuff), so sorry no support for it.
Why not buy a m5stack atom s3 for 8.50 euros, and a cable, just plug and play. Wifi connection for atom s3 is also quite better according to @F1p
you could also try to make a longer cable such that the esp is outside the control unit, or have an accesspoint closer to your heatpump?
I would go this way so, buying an S3. Already made a longer cable, at the moment the esp is 2 metres away from the unit but sitll nothing. Buying a repeater is a bit too much as I just need few more decibels to have a stable signal.
Thanks anyway!
Agree, swapping @gekkekoe for ESP8266 isn’t worth the effort.
You can get +20dBm increase from M5Stack S3 Atom in testing.
My MQTT based project is easier to compile for ESP8266 or ESP32
Thank you, can you just provide an Aliexpress link for the S3 board? Looks like there are many alternatives but not the M5Stack version which I believe I can olny buy through their website but shipping costs to my place are way too much 
“where to buy”. where are you located? m5stack has a lot of resellers, so should not be that bad shipping.
look for “m5sack atom s3 lite” on aliexpress and this was the first hit: M5Stack Officiële ATOMS3 Lite ESP32S3 Dev Kit - AliExpress 7
btw, esphome can also be configured to work with mqtt (can be used with domoticz this way). But for ESP8266 use solution provided by @F1p.
Thanks, bought it on Ali. I’m in Italy but weird enough that’s one item with shipping costs! 13 euro shipped, wil keep you guys posted in by the end of Aug 
Thanks for supporting!
digikey has free shipping for orders > 50 euros to europe.
https://www.digikey.nl/en/products/detail/m5stack-technology-co-ltd/C124/18070571
you can also buy cable parts and other goodies from them, really fast shipping.
I use this wi-fi room thermostat:
It connects to a connector marked CNRF on the mainboard.
Will it be okay to leave this if i use your solution?
CN105 is not connected as it is right now.
Yes, I use these wireless thermostats too and CN105
When you change the thermostat via CN105, these also change to match after a few minutes
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Hi @F1p, I ordered the incorrect thermistor kit originally but have the correct one now. Just need to find time to plug in once I’ve completed my conversion to cascaded system.
I’m running on immersion currently and using your solution with Home Assistant to switch the immersion relay off when the tank is up to temperature 
.
I’m currently battling with controlling the DHW tank circulator (pump 4) in cascade mode which doesn’t appear to be supported/possible in cascade mode. May well have to use your solution to trigger when DHW mode is active. My preference was to keep it OEM but it’s looking unlikely. Plus side will be I can do smart things like only running the DHW circulation pump when the flow temperature is above the tank temperature etc.
There was a few cascade unit values available over the CN105 but not yet included.
Are you going to be plugged into the Master controller?
I’m planning to have a unit plugged in to each controller as some data (such as flow rate) is only available from the slave controllers.
Finally arrived, everything looks amazing so far. Thank you everybody for the support!
Curiosity: what kind of card are you using in your dashboard to display/change values from the heatpump?
I just use standard HA. btw how’s the wifi ? we moved to esp-idf framework, saw some nice improvements locally
Definitely improved quite a lot, I’m getting -66dbm stable
Two updates here -
@gekkekoe’s library now does support ESP8266
With the help of this community, we have both updated to include these Thermistors
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