Matter: How to add custom attributes and commands into the standard cluster (ex: occupancy cluster server)

[Bhavya Mathukiya]

Dear Team,

I would like to know if it is possible to add custom attributes and commands to standard clusters, such as the Occupancy cluster. I have reviewed the "Adding a Custom Cluster" guide provided by Nordic, but I am unsure how to proceed with modifying standard clusters.

Could you please advise if this is feasible and, if so, provide some guidance on how to implement it?

Best regards,
Bhavya

[Maria Gilje]

Hi Bhavya, 

I will investigate if it is allowed by the Matter specification to add attributes/commands which are not included in the cluster definition. I suggest that you also check this if you are able to. 

I assume you are using the latest nRF Connect SDK release (v3.0.2)? This is important to refer to the correct version of the Matter specification(s). If you are using nRF Connect SDK, the Matter v1.4 specification is the correct version. 

Best regards,

Maria

[Bhavya Mathukiya]

Hi Maria Gilje ,

I m using NCS v3.0.1.

Best regards,

Bhavya 

[Maria Gilje]

Hi Bhavya,

It is supported by the specification to add manufacturer specific extensions to standard clusters. Please see Ch. 7.20 in the Matter specification v1.4 for details. 

In nRF Connect SDK you can modify clusters by using our newly released nRF Connect Matter Manufacturer Cluster Editor tool and more specifically the section on creating a cluster extension. 

Best regards,

Maria

[Bhavya Mathukiya]

Hi Maria Gilje ,

I have gone through the section on creating a cluster extension. I have taken OccupancySensing.xml from the path /home/bhavya/ncs/v3.0.1/modules/lib/matter/data_model/1.4.1/clusters/OccupancySensing.xml but the tool shows below error:

Can you please check if I am doing any wrong steps? Basically, I want to modify Occupancy cluster.

Best regards,

Bhavya

[Maria Gilje]

Hi Bhavya,

You need to use the Occupancy server cluster from ncs/v3.0.1/modules/lib/matter/src/app/zap-templates/zcl/data-model/chip/ as a source file, that is, this file: https://github.com/nrfconnect/sdk-connectedhomeip/blob/v3.0.1/src/app/zap-templates/zcl/data-model/chip/occupancy-sensing-cluster.xml. 

Best regards,

Maria