How to Retrieve Light Device's VID from On/Off Switch in Matter

[paper555]

Dear Matter Support Team,

I have a setup where an On/Off Switch device is successfully bound to a Light device in our Matter network. 

I would like to know which specific interface or method should be used on the On/Off Switch device to retrieve the Vendor ID (VID) of the bound Light device.

[AHaug]

Hi,

You can use the Matter Read Client functionality on the On/Off Switch device to read the vendor-id attribute from the Basic Information cluster of the bound Light device. This is the standard and supported way to retrieve the Vendor ID in a Matter network using Nordic's SDK Read Client functionality Step 8: Read basic information from the Matter device. Use the Read Client API to send a read request for the vendor-id attribute in the Basic Information cluster of the bound Light device. The specific attribute to read is vendor-id in the Basic Information cluster (cluster ID 0x0028).

Kind regards,
Andreas

[paper555]

Could you please tell me how to read the VID in basicinformation through the read client? I already know how to control a light with a switch, but I don't know how to read the VID. Could you provide me with an interface?

[AHaug]

I think the best approach is to go through the chip tool guide from start to step 8

https://docs.nordicsemi.com/bundle/ncs-latest/page/matter/chip_tool_guide.html

Kind regards,
Andreas

[paper555]

I want to obtain the VID of the light device through the switch device, not via the chip-tool. I know the Basic Information Cluster contains the VID. What I need is the device-side API to retrieve it, not through chip-tool. Could you provide a feasible function?

[AHaug]

Hi,

Then again I would like to point you to the Read Client API as well as have a look at this call https://github.com/nrfconnect/sdk-nrf/blob/98093aadc688f4305de69f15c17c4be98e70d572/samples/matter/thermostat/src/temperature_measurement/sensor.cpp#L97-L125 

Kind regards,
Andreas

[paper555]

Can a controller read other devices' vendor-id via Basic Information without performing a bind operation?

[AHaug]

Hi,

To my understanding a binding is not required when for instance a controller is reading the VID of a light. Then you can just use the Node ID

Kind regards,
Andreas