Hi @schnetf, I followed the instructions from @cathoderay and also a search in Youtube - is it via the Service Menu (password is 234) and then Heat Settings, there is also a setting I missed to turn on the Heat Curve. It then was visble on the APP.

@cathoderay you are a star. And I feel like an idiot for not realising the WC needs to be turned on via the wall panel.

I have HA running mainly to monitor PV, switch lights, and various temp, humidity, power sensors throughout the house. With your guide I might give modbus a chance. 

Many thanks. This forum is awesome.

Posted by: @schnetf

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I have HA running mainly to monitor PV, switch lights, and various temp, humidity, power sensors throughout the house. With your guide I might give modbus a chance. 

There is an easy way to integrate a midea with home assistant. See here if of interest.

This evening I've actually added a couple of new monitoring graphs for COP to my dashboard using apexcharts, separating out space heating and DHW based on cathoderays advice and using SV1 register which is accessible via modbus- the one that can specify when DHW is active. The native history card is really useful as well. Far better than the app, and 100% stable (so far).

Posted by: @schnetf

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I have HA running

You are 90% of the way there. You can use the midea_ac_lan integration which 'snoops' on the app's wifi data, but it is a bit flaky and only gives access to limited data. Going down the modbus route not only gives you access to all the data listed in the modbus register address tables in the wired controller manual, it also means you can write to the registers, ie change settings, for example adjust the WCC, as I do with my auto-adapt script.

The actual physical connection: at the wired controller end it is just two wires plus earth onto screwed terminals and the terminal resistor (all very standard modbus stuff). At the PC/HA end, I use a RS-485 to USB converter which means the data appears as a serial/USB port which I then read (and write to) using the python minimalmodbus package. If you are going to feed the data into HA (which I don't do), you will I think need to use a slightly different approach. The link @benson provides above gives one approach, I think there may be other (ESP?) ways, @majordennisbloodnok is I believe well clued up on these things. He was probably in SigInt when he was in the Army. 

Posted by: @cathoderay

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...

He was probably in SigInt when he was in the Army.

...

Unlike the various Walter Mitty characters hitting the news today for pretending a history of Armed Forces service, I am not going to claim any military background at all beyond a liking for the humour of the Goon Show and a certain affinity with the flatulant character of Major Denis Bloodnok, late of the 3rd Disgusting Fusiliers, OBE, MT, MT and MT

As for presenting modbus to Home Assistant, it is perfectly possible to use a serial connection just as @cathoderay does. However, my personal preference is to use an RS485 to Ethernet adapter instead of an RS485 to USB adapter, and the one most commonly talked about and used for the job is a Waveshare. Specifically, mine is a Waveshare RS485 to PoE Eth, meaning that it is powered by Power over Ethernet, but other variations are available. I hasten to add that my Home Assistant modbus connection is with my inverter, not my heat pump, but eventually modbus is modbus.

I also agree with @cathoderay that there are plenty of ESP32-based solutions, some of which talk to the ESPHome addon (like the Svenar option @benson mentioned earlier) and some of which transmit and receive MQTT messages to an addon like Mosquitto Broker. There are many ways of getting that modbus data into Home Assistant, some more hands-on than others, but since @benson has already outlined one method that is confirmed to work for him, I'd suggest that's a good start.

Posted by: @stevet

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slightly off topic. Driving home from the gym this afternoon  - Radio 2 had a phone in on Solar Panel, Batteries and ASHP's  - primary focused on Solar panels. Not sure how they selected the callers, but 9-10 did not recommend their Solars. One said he paid tax on revenue, other said amount generated was negligible, property lost value, could charge his EV properly. Their was an ASHP customer who's supplier went into administration and was left with a partially installed system - from what I gleamed she just needed a WC curve. 

Feel free to start a new topic on this.... and 'tag' me if you do.

Lack of public awareness on energy issues is a serous problem.

A customer can't ask their Installer to include configuring the WC Curve when they undertake the mandatory commissioning,
unless they have some idea that such a feature exists.

Posted by: @benson

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There is an easy way to integrate a midea with home assistant. See here if of interest.

Unfortunately, I have a wall unit that's not compatible. 

Posted by: @cathoderay

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You can use the midea_ac_lan integration

I actually set this up when I got the ASHP installed. But all I could see it used for is to change the temp for DHW (e.g. make a DHW schedule to heat up during cheap night time tariff) and to do the same thermostat/climate job of my Hive. Hence, I left it at a simple DHW cycle and never really investigated this further.

It seems there was a treasure trove of data collected by HA though. Today, I created a quick apexchart to look at my COP over last week (the gap on the 20th is where I lost connection to the wall unit again and hunting for a solution ultimately led me to this forum).

Next stop, modbus. I will probably go down an RS485 to WiFi route as I would need at least two holes through the outer wall and an inner wall to get to my router cabinet. Will report back with progress reports. Or come crying for help...

Posted by: @schnetf

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Unfortunately, I have a wall unit that's not compatible. 

As I am a bit involved in the “Svenar” controller, I am curious which wall unit/wired controller you have. Can you share a bit more details?

@mosibi 

I should have said, I think it's not compatible. See pic. I can't see any cables going to the H1 / H2. 

Or is this the stuff I am supposed to wire up? I am scientist. I mix liquids for a living. Lose cables scare me 🤣 

From what I can see from here, that looks very much like the 5 wire version that is compatible, not the two wire version that's not, @schnetf.

As for modbus, rather than drilling holes in walls, have you considered running the cable up the wall to the soffit and then into the house that way? A wired connection is far more reliable than wifi, and if you've got a router cabinet I'm guessing you've got structured cabling so you could easily make use of that, simply getting the wire to the nearest RJ45 socket and then routing back to your patch panel before using a patch lead from the panel to the RS485 to Eth adapter.

@schnetf — have a closer look at the arrowed connections, I think they are the modbus connection terminals (the photo is a bit blurred):

@schnetf As @cathoderay and @majordennisbloodnok already said, your controller has the required 5 connection points.