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Connecting to Midea MSmartHome using a PC

cathodeRay · 2022-11-30T10:53:35Z

I may or may not have made some progress on this Holy Grail. The goal is to be able to download historical power consumption and capacity data etc to provide a record of this data plus calculated COPs over time. I have found a couple of python modules that claim to be able to connect to Midea appliances (the names are also links to the github pages): (1) midea-beautiful-air (2) msmart Both can see my Midea controller on my local network, and both report stuff like IP address, port, tokens and IDs and what looks like Midea's server: Using Midea cloud server:False but that link just gets {"msg":"调用业务系统异常(访问地址不存在) [no Route matched with those values]","code":40404} This indicates the url is something, but I am not using the right full url to connect. I can ping the device ip address but not connect to it... The connection strings produce authentication errors. I will carry on testing. If anyone else fancies working on this as well, I would very much welcome that.

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batalto

(@batalto)

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Joined: 5 years ago

Posts: 1092

05/03/2023 9:30 pm

@cathoderay to be honest I've not look at it in a while. Anything you suggest I look for?

12kW Midea ASHP - 8.4kw solar - 29kWh batteries
262m2 house in Hampshire
Current weather compensation: 47@-2 and 31@17
My current performance can be found - HERE
Heat pump calculator spreadsheet - HERE

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cathodeRay

(@cathoderay)

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Topic starter 05/03/2023 9:51 pm

@batalto - if you can, see if you can see any record of a recent update? I can't, but my 'smart' phone isn't very smart.

Midea 14kW (for now...) ASHP heating both building and DHW

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batalto

(@batalto)

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05/03/2023 9:56 pm

@cathoderay this is what I have

Screenshot 2023 03 05 20 56 27 30 b5a5c5cb02ca09c784c5d88160e2ec24

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cathodeRay

(@cathoderay)

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Topic starter 06/03/2023 9:08 am

@batalto - that is interesting, I don't appear to have such a screen. But that does make it appear that the latest update was over a couple of weeks ago, so it seems unlikely that a covert upgrade broke my midea_ac_lan connection.

This morning, even after rebooting the mini PC, I can't connect to it, and it doesn't appear on the LAN. I'm going to have to get out the monitor again and see what is going on. All very tedious and boring...

Midea 14kW (for now...) ASHP heating both building and DHW

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Derek M

(@derek-m)

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Posts: 4425

06/03/2023 5:35 pm

@cathoderay

The 30 second refresh time delay comes from the 2010 software, a link to which you posted on page 2 of the present thread. This is the version that I have been using to investigate the software. It is now obvious that this may have differences from the version that you are using.

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cathodeRay

(@cathoderay)

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Topic starter 06/03/2023 6:47 pm

@derek-m - I don't think they should be too different, if at all. Only a very small number of the individual files in the full library get changed, I think only wasilukm versions of core/device.py c3/device.py and c3/message.py have had changes, and I sent you my working copies not so long ago (the zipped ones you couldn't open initially). I'm pretty sure we are working on the same code.

I think the 2010 is just part of the developer's name on github, all the files are much more recent, months not years old.

I've managed to get HA and midea_ac_lan back again, albeit with missing data for the time it was FUBAR. I think it is probably a dynamic IP address problem, I had to redo all the connections because IP addresses had changed. I seem to recall this is yet another HAPITA.

Midea 14kW (for now...) ASHP heating both building and DHW

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Derek M

(@derek-m)

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Posts: 4425

06/03/2023 8:31 pm

@cathoderay

Working on the theory that the files are virtually the same, I think that rather than adding further code at the moment, it would be best to confirm what action the present code is performing. I suggest that you try commenting certain lines of code in turn, to see what happens to the message produced.

Start by commenting the following line in C3/device.py

class DeviceAttributes(StrEnum):

tank_actual_temperature = "tank_actual_temperature"

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Derek M

(@derek-m)

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06/03/2023 8:47 pm

@cathoderay

Once the previous test has been completed, then remove the comment and comment the following line as shown below.

class MideaC3Device(MiedaDevice):

# DeviceAttributes.tank_actual_temperature: None,

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Derek M

(@derek-m)

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06/03/2023 9:07 pm

@cathoderay

Continue the testing procedure in C3/message.py, as shown below.

class C3MessageBody(MessageBody):

# self.tank_actual_temperature = body[data_offset + 21]

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cathodeRay

(@cathoderay)

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Topic starter 07/03/2023 9:45 am

Posted by: @derek-m

↑

Start by commenting the following line in C3/device.py
class DeviceAttributes(StrEnum):
tank_actual_temperature = "tank_actual_temperature"

Unfortunately, it breaks the code, and midea_ac_lan fails to start:

AttributeError: tank_actual_temperature
2023-03-07 08:39:58.571 ERROR (MainThread) [homeassistant.setup] Setup failed for custom integration midea_ac_lan: Unable to import component: Exception importing custom_components.midea_ac_lan

I've noticed this before, python is very fastidious, even the smallest exception breaks it.

Midea 14kW (for now...) ASHP heating both building and DHW

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Derek M

(@derek-m)

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07/03/2023 12:15 pm

Posted by: @derek-m

↑

@cathoderay

Once the previous test has been completed, then remove the comment and comment the following line as shown below.
class MideaC3Device(MiedaDevice):

# DeviceAttributes.tank_actual_temperature: None,

Okay, try changing the value to something like 100, to see if that value appears in the message or whether it is overwritten by the true value.

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cathodeRay

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Topic starter 07/03/2023 12:28 pm

Posted by: @derek-m

↑

try changing the value to something like 100, to see if that value appears in the message or whether it is overwritten by the true value

It gets overwritten by the true value, 'tank_actual_temperature': 38 in the log 'Status update' and 38 degrees C shows on HA dashboard. That seems plausible, the None is perhaps a default value, in the event nothing is returned.

Midea 14kW (for now...) ASHP heating both building and DHW

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