Can the matter switch be aware of the matter light bulb's status (On or Off)

[Basem Barakat]

Hi,

Can the matter switch be aware of the matter light bulb's status (On or Off)?

For the matter light switch example the on/off cluster doesn't have an on/off attribute, and it seems that it doesn't store the status value of the switch (On or Off).

So this api doesn't exist for the matter switch

status = Clusters::OnOff::Attributes::OnOff::Get(endpointID, &storedValue);

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Is there a way to enable the light switch to be aware of the light bulb status?

Note that I can't Implement my logic to store the switch status on the NVS, because the bulb's status might be changed from a source other than the switch like a mobile app, so the stored switch's status will be different from the bulb's status, because the switch store its status depending on the button toggling.

So I need a way to get the bulb's status from within the matter light switch example.

Best regards,

Basem

[Sigurd Hellesvik]

Hi,

So this api doesn't exist for the matter switch

What exactly do you mean by this?

Regards,
Sigurd Hellesvik

[Basem Barakat]

In the matter light bulb example I found the same API used in the zcl_callbacks.cpp to get the endpoint status.

Also I used this API to get the light bulb status from the NVS, within the matter light bulb example.

I do that in the matter light bulb example, because the light bulb example uses the onoff cluster (server) but the switch use the on/off cluster as a client, where the on/off cluster of the matter light switch example doesn't have an on/off attribute where I can read/get its value using this API.

Or I misunderstand.

I need the light switch to be aware of the light bulb status.

Regards,

[Sigurd Hellesvik]

I think maybe  RE: [Matter] Is there an example/tutorial how to deal with subscriptions / readings of an Cluster - Attribute with a device (not with CHIP Tool) 

discusses what you need.

Can you have a look at this case and let me know if it is what you need?

EDIT: Also maybe this:   RE: Chiptool to configure the matter devices with google nest hub

[Basem Barakat]

Thanks Sigurd I'll check them and get back to you.