Resol Controller (Hass-Resol-KM2 Integration)

Home Assistant custom component to log sensor information from Resol devices using KM2 communication module. This is my first time programming in Python and publishing to Github. Over time, this component has been updated to also work with DL2 and JSON Live Data Server.

This component was inspired by dm82m/hass-Deltasol-KM2 and I used some of dm82m's code to fetch the KM2's data via webservice.

Changes and improvements:

I have made the following changes to dm82m's component. Some are improvements, others maybe not so. The main purpose for me was to learn Python, program my first HASS custom integration from scratch and to publish to github.

• Setup via custom_flow using multiple steps
• Add port as connection detail
• Combine KM2 specific sensors into devices as suggested by hoppel118
• Group sensors into 'useful' device sensors and less important diagnostics sensors
• Each sensor entity_id incorporate unique device name, yet presents friendly sensor name
• Update of the full dataset of all sensors belonging to a KM2 device with single API call
• Sensors that are disabled are skipped for updates, same with sensors where the state value has not changed
• Present additional device specific attributes on each sensor
• Extensive debug logging (hopefully helpful to anyone going through the same learning curve as myself)
• Adding translations (German, Portugese, Afrikaans, Dutch)

My own wish list for future improvements:

• HACS integration
• Pull (via curl) the device uptime from Web Interface into new device diagnostics sensor
• Extend translations
• Extend from KM2 module to DL2, KM1 and VBUS API
• Companian card with visualization
• Logging into txt file
• Synchronise device and integration 'custom name'
• support for https

Installation

HACS

1. Just search for "Resol Controller" integration in HACS. It will be automatically installed to the custom_integration/resol directory
2. Restart Home Assistant.
3. In the HA UI go to "Configuration" -> "Integrations" click "+" and search for "Resol Controller"
4. Follow the UI based Configuration

Manual install

Create a directory called resol in the <config directory>/custom_components/ directory on your Home Assistant instance. Install this component by copying all files in /custom_components/resol/ folder from this repo into the new <config directory>/custom_components/resol/ directory you just created.

This is how your custom_components directory should look like:

custom_components
├── resol
├────── translations
│   ├───└── af.json
│   ├───└── de.json
│   ├───└── en.json
│   ├───└── nl.json
│   ├───└── pt.json
│   ├── __init__.py
│   ├── config_flow.py
│   ├── const.py
│   ├── manifest.json
│   ├── resolapi.py
│   ├── sensor.py
│   └── strings.json  

Configuration

I have tested the component with two older KM2 controllers, one on firmware 1.1 and the other on 1.2. Firmware updates can be found on Resol's website

Instead of relying on YAML code to setup this component, I opted for a custom flow which setups actual devices with its corresponding sensors.

To start the setup of this custom integration:

• go to Home Assistant's Integration Dashboard
• Add Integration
• Search for Resol Controller
• Follow the prompts in step 1 and 2

Step 1 - Connection details

The following connection details are required to detect the Resol KM2 device:

• Host: internal IP or hostname
• Port: default 80, change to any http port and make sure port forwarding on your router is activated.
• Username: default 'admin'
• Password: Password of the KM2. If you have not changed it, the default password is typically printed on a sticker attached to the device

Step 2 - Device options

The following optional parameters can be configured in step 2 of the setup process:

• Friendly custom name: Default is the device name as provided by the KM2 controller.
• Polling interval: Default 60 seconds, time delta to pull new sensor data.
• Group sensors on device page: If this option is ticked, the actual device data such as temperature, pump speed will be seperated from diagnostics data such as software version, system time, error masks etc. This will reduce history database within HASS and visually seperate device data on the device page.
• Disable diagnostic sensors: If ticked, diagnostic sensors will be disabled by default. You can enable them via the UI.

Controllers and devices

After succcessful setup, the controllers representing Resol KM2 devices should show up in a list.

On any controller's device page, the hardware related device information is displayed, together with sensors typically grouped into main entity sensors and diagnostics. A quicklink to the Resol KM2 module is available under the 'Visit' link.

As you can see in the following screenshot, I have manually disabled some of the temperature and pump speed sensors and enabled some other diagnostics sensors using the HASS GUI.

Sensors

Sensors are registered to each device (which is an instance of Resol Controller) as sensor.km2_{serial}_{sensor_name} with an easy to read friendly name of sensor_name. Additional attributes are presented on each sensor:

• Product Description, Destination Name, Source Name: Some internal names from Resol
• Internal Unique ID: {serial}_{header}_{sensor_hex}
• Device Name: as registered in the KM2 web interface upon registration
• Vendor Product Serial: serial number of the KM2 interface, typically matches the MAC address of the Ethernet adapter
• Vendor Firmware Version: as provided by the KM2 web interface upon registration
• Vendor Product Build: as provided by the KM2 web interface upon registration
• Vendor Product Features: as provided by the KM2 web interface upon registration

Troubleshooting

Please set your logging for the this custom component to debug during initial setup phase. If everything works well, you are safe to remove the debug logging:

logger:
  default: warn
  logs:
    custom_components.resol: info

Here is a copy of my log files for 2x KM2 devices successfully setup, 19 sensors for each device registered, and updates over time:

2023-11-17 09:18:24.495 INFO (MainThread) [custom_components.resol]
2023-11-17 09:20:48.454 INFO (MainThread) [custom_components.resol] A840411679E7: All '19' sensors have registered.
2023-11-17 09:21:21.197 INFO (MainThread) [custom_components.resol] A8404116CFCF: All '19' sensors have registered.
2023-11-17 09:22:21.426 INFO (MainThread) [custom_components.resol] A8404116CFCF: A total of '2' sensors have updated, '10' are disabled and skipped update, '7' sensors value remained constant and '0' sensors occured any errors.
2023-11-17 09:23:06.922 INFO (MainThread) [custom_components.resol] A840411679E7: All '19' sensors have registered.
2023-11-17 09:23:48.677 INFO (MainThread) [custom_components.resol] A840411679E7: A total of '2' sensors have updated, '10' are disabled and skipped update, '7' sensors value remained constant and '0' sensors occured any errors.
2023-11-17 09:24:07.140 INFO (MainThread) [custom_components.resol] A840411679E7: A total of '0' sensors have updated, '10' are disabled and skipped update, '9' sensors value remained constant and '0' sensors occured any errors.
2023-11-17 09:24:48.680 INFO (MainThread) [custom_components.resol] A840411679E7: A total of '1' sensors have updated, '10' are disabled and skipped update, '8' sensors value remained constant and '0' sensors occured any errors.
2023-11-17 09:25:07.141 INFO (MainThread) [custom_components.resol] A840411679E7: A total of '1' sensors have updated, '10' are disabled and skipped update, '8' sensors value remained constant and '0' sensors occured any errors.

Credits

Thank you for inspiring me to start learning Python and re-programming the existing deltasol KM2 controller from scratch: dm82m

Thank you for in-depth documentation on Resol controllers: danielwippermann, and this discussion is worth a read.