pykumo

Python library to interact with Mitsubishi KumoCloud devices via their local API.

The hard work of generating the security token was done by https://github.com/sushilks/kumojs and that part is based heavily on his code, translated to Python by me.

Kumo System Components

Outdoor Unit

The outdoor unit houses the compressor and the outdoor coil. Each indoor unit connects back to its outdoor unit by a pair of refrigerant lines and an electric power supply & communication cable. KumoCloud does not appear to be able to communicate directly with an outdoor unit

Indoor Unit

The indoor unit(s) are in the controlled space and house the indoor fan & coil, providing cooling or heating. An indoor unit can have:

• WiFi adapter (e.g. PAC-USWHS002-WF-2) (via CN105 connector)
• Wall-mounted controller MHK2 (via CN105 connector)
• Wireless remote sensor (via Bluetooth to the WiFi adapter) An indoor unit with WiFi adapter has its own IP address.

Pykumo communicates with the indoor unit via the WiFi adapter, using an API that it exposes.

MHK2

The MHK2 wall-mounted controller, if present, acts like a traditional thermostat for a single indoor unit, while also providing other controls and its own temperature & humidity sensors.

Kumo Station

Kumo Station allows controlling traditional HVAC equipment via the Kumo Cloud app, managing switchover between Kumo and external equipment. It also provides an outdoor temperature sensor. A Kumo Station has its own IP address.

Interactive use

It's possible to use pykumo in an interactive shell to do debugging, investigation of possible new features, etc.

I recommend doing this work in a virtualenv, which web searching will describe if you're not familiar.

Start an interactive Python shell

pip3 install pykumo
python3

Set up KumoCloudAccount

Inside the Python shell:

import pykumo
account = pykumo.KumoCloudAccount.Factory()

This will prompt for your KumoCloud username & password

account.get_indoor_units()

If successful, get_indoor_units will print a list of your indoor units' serial numbers

Get indoor units

kumos = account.make_pykumos()
unit = kumos['<indoor unit name>']
unit.update_status()

The indoor unit name is the human-readable name. If successful, update_status will print True. You can then make the various API calls on the unit object.

Raw information from indoor unit

You can print the internal state of the indoor unit object, which includes the JSON information fetched from the unit itself. This is a good place to look when requesting support of additional pykumo features.

import pprint
pp = pp.PrettyPrinter()
pp.pprint(unit.__dict__)

Direct indoor unit calls

The indoor units speak a simple protocol of nested JSON. I'm not documenting the protocol here (though documentation patches would be welcome!), but if you look through the pykumo.py code for calls to self._request you can see the queries and commands that are already in use. For example:

query = '{"c":{"indoorUnit":{"status":{}}}}'.encode('utf-8')
unit._request(query)

This prints the primary record, the status object. Most of the valid queries and commands were discovered by snooping the traffic between the KumoCloud app and the indoor unit; some by experimentation. It's possible more values and controls are available than have been discovered, especially on indoor units newer than those owned by this author.