GROHE ONDUS Binding

The GROHE ONDUS Binding provides access to data collected by a GROHE ONDUS appliance, such as an GROHE Sense Guard (opens new window). The binding uses the REST API interface (the same as used by the Android App) to retrieve the collected data.

Supported Things

This binding should support all appliances from GROHE, however, only the GROHE Sense Guard is tested with it.

Thing type	Name
account	GROHE ONDUS Account
senseguard	GROHE SENSE Guard device
sense	GROHE SENSE device

Discovery

The binding requires you to create at least one Account thing as a bridge manually. The discovery process will look through all locations and rooms of your configured GROHE account and adds each found appliance as a new thing automatically to the inbox.

Binding Configuration

This binding does not require any configuration outside of things.

Thing Configuration

There is only one thing and one bridge that needs to be configured together to get this binding to work, see the full example section for a self-explaining example.

Account Bridge

The groheondus:account bridge is used to configure the API interface for a specific account, which is used to access the collected and saved data of your GROHE account. You can either use your username and password combination for logging in into your GROHE account, in which case both parameters, username as well as password, are required arguments and refer to the same login credentials you used during setting up your GROHE account or while logging into the app. Alternatively you can use a so called refresh token to grant openHAB access to your account without having to share your credentials with the system. For that you need to obtain such refresh token from the GROHE ONDUS Api (see more on that below) and paste this string into the respective input field on the account management page you can reach from http://<your-openHAB-domain-and-port>/groheondus. On this site you can also delete a previously saved refresh token. The GROHE ONDUS binding also refreshes this refresh token in order to ensure that you stay logged in.

Appliance

The groheondus:sense and groheondus:senseguard things are used to retrieve information of a specific appliance from GROHE. This appliance needs to be connected with your GROHE ONDUS account as configured in the corresponding Account Bridge. The appliance needs to be configured with the unique appliance ID (with the applianceId configuration) as well as the roomId and the locationId. Once the account bridge is configured, the appliances in your account will be discovered as Appliance things.

Configuration	Default value	Description
applianceId	''	Unique ID of the appliance in the GROHE ONDUS account
roomId	''	ID of the room the appliance is in
locationId	''	ID of the location (building) the appliance is in
pollingInterval	Retrieved from API,	Interval in seconds to get new data from the API
	usually 900	The sense thing uses 900 by default

Channels

senseguard

Channel	Type	Description
name	String	The name of the appliance
pressure	Number:Pressure	The pressure of your water supply
temperature_guard	Number:Temperature	The ambient temperature of the appliance
valve_open	Switch	Valve switch
waterconsumption	Number	The amount of water used in a specific timeframe

sense

Channel	Type	Description
name	String	The name of the appliance
humidity	Number:Dimensionless	The humidity measured by the appliance
temperature	Number:Temperature	The ambient temperature of the appliance
battery	Number	The battery level of the appliance

Full Example

Things file:

Bridge groheondus:account:account1 [ username="[email protected]", password="YourStrongPasswordHere!" ] {
    groheondus:senseguard:550e8400-e29b-11d4-a716-446655440000 [ applianceId="550e8400-e29b-11d4-a716-446655440000", roomId=456, locationId=123 ] {
        Channels:
            Type number : waterconsumption [
               timeframe=3
            ]
    }
    groheondus:sense:550e8400-e29b-11d4-a716-446655440000 [ applianceId="444e8400-e29b-11d4-a716-446655440000", roomId=456, locationId=123 ]
}

Items file:

String Name_Sense_Guard "Appliance Name" {channel="groheondus:senseguard:groheondus:appliance:550e8400-e29b-11d4-a716-446655440000:name"}
Number:Pressure Pressure_Sense_Guard "Pressure [%.1f %unit%]" {channel="groheondus:senseguard:groheondus:appliance:550e8400-e29b-11d4-a716-446655440000:pressure"}
Number:Temperature Temperature_Sense_Guard "Temperature [%.1f %unit%]" {channel="groheondus:senseguard:groheondus:appliance:550e8400-e29b-11d4-a716-446655440000:temperature_guard"}

String Name_Sense "Temperature [%.1f %unit%]" {channel="groheondus:sense:groheondus:appliance:444e8400-e29b-11d4-a716-446655440000:name"}
Number:Temperature Temperature_Sense "Temperature [%.1f %unit%]" {channel="groheondus:sense:groheondus:appliance:444e8400-e29b-11d4-a716-446655440000:temperature"}
Number Humidity_Sense "Humidity [%.1f %unit%]" {channel="groheondus:sense:groheondus:appliance:444e8400-e29b-11d4-a716-446655440000:humidity"}

Obtaining a refresh token

Actually obtaining a refresh token from the GROHE ONDUS Api requires some manual steps. In order to more deeply understand what is happening during the process, you can read more information about the OAuth2/OIDC (OpenID Connect) login flow by searching for these terms in your favorite search engine. Here is a short step-by-step guide on how to obtain a refresh token:

1. Open a new tab in your Internet browser
2. Open the developer console of your browser (mostly possible by pressing F12)
3. Select the network tab of the developer console (which shows you the network request done by the browser)
4. Open the following URL: https://idp2-apigw.cloud.grohe.com/v3/iot/oidc/login (opens new window)
5. You will automatically being redirected to the GROHE ONDUS login page, login there
6. After logging in successfully, nothing should happen, except a failed request to a page starting with token?
7. Click on this request (the URL in the request overview should start with ondus://idp2-apigw.cloud.grohe.com/v3/iot/oidc/token? or something like that
8. Copy the whole request URL (which should contain a lot of stuff, like a state parameter and so on)
9. Open a new tab in your Internet browser and paste the URL into the address bar (do not hit ENTER or start the navigation to this page, yet)
10. Replace the ondus:// part of the URL with https:// and hit ENTER
11. The response of the page should be plain text with a so called JSON object. Somewhere in the text should be a refresh_token string, select the string after this refresh_token text, which is encapsulated with ".

E.g.: If the response of the page looks like this:

{
    "access_token": "the_access_token",
    "expires_in":3600,
    "refresh_expires_in":15552000,
    "refresh_token":"the_refresh_token",
    "token_type":"bearer",
    "id_token":"the_id_token",
    "not-before-policy":0,
    "session_state":"a-state",
    "scope":"",
    "tandc_accepted":true,
    "partialLogin":false
}

Then the refresh_token value you should copy would be: the_refresh_token. This value is the refresh token you should save as described above.

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