Iterate through Matter devices on Fabric

RE: Iterate through Matter devices on Fabric

fhfs — Mon, 15 Jan 2024 11:59:26 GMT

Thank you for your response, I have some reading to do!

RE: Iterate through Matter devices on Fabric

Maria Gilje — Thu, 11 Jan 2024 12:55:49 GMT

Hello again,

The response from a developer is summarized below.

[quote user=""]3. How can I request a list of nodes in the Matter Fabric, from the Matter device?[/quote]

In general, discovering devices in the same network is done by the DNS entries registered by the nodes and commissioner.

You need a DNS resolver to find the other nodes in the fabric. In NCS you can use the SHELL command matter dns resolve in the connected terminal after including CONFIG_CHIP_LIB_SHELL=y into prj.conf. See Using CLI in nRF Connect examples for more information on the Matter shell commands and usage.

The NCS samples uses binding, which again uses a DNS resolver in a way which is not visible for the user. So the node ID is not discoverable for the user in the default NCS samples.

[quote user=""]What class/functions do I use on the Nordic Matter Lighting example to view/operate all the nodes in the fabric?[/quote]

You can modify the sample to include a DNS resolver by adding the methods of Dnssd::ResolverProxy from the SHELL command implementation for DNS resolver (NCS v2.5.1) .

Best regards,

Maria

RE: Iterate through Matter devices on Fabric

Maria Gilje — Thu, 11 Jan 2024 09:13:34 GMT

Hello,

[quote user=""]1. That Matter device should be able to communicate with any device on that fabric?[/quote]

Yes:

For a fabric with a single-network topology the nodes can communicate with any other node through a single network interface. See the Matter 1.1 Core Specification Ch 2.3.1.
For a fabric with several peripheral networks, communication is the same as in 1. for nodes in the same peripheral network or through a border router for communication across network boundaries. See Matter 1.1 Core Specification Ch. 2.3.2.

[quote user=""]2. Depending on the privilege in the access control cluster that Matter device can view/operate/manage/administer any device on the fabric?[/quote]

Correct. See more on this in the Access Control Guide.

[quote user=""]3. How can I request a list of nodes in the Matter Fabric, from the Matter device?[/quote]

You can find the different forms of discovery in a Matter fabric in Ch. 4.3 of Matter 1.1 Core Specification. Operational discovery is covered in Ch. 4.3.2

I realize this does not have any information on the actual implementation, so I will contact our developers to ask for specific information about this in NCS.

[quote user=""]What class/functions do I use on the Nordic Matter Lighting example to view/operate all the nodes in the fabric?[/quote]

I will include this when contacting the developers.

Edit: For us to give you the most relevant information please specify which NCS version you are using and if you are using the Matter: Light Switch or Matter: Light Bulb sample.

Best regards,

Maria