Request for a level measurement example (CON-813)

[MichaelHeiser]

Is your feature request related to a problem? Please describe. The device which should integrate into a matter environment measures the level of a water or oil tank for example. It seems that with cluster level_control you can only set levels to a specific value and not to measure the level and send the level to the controller for making an alarm for example.

Describe the solution you'd like

• Device measures the level of a liquid / gas / solid quantity
• there is a max level and a min level defined
• on reaching min level an alert has to be notified (eg. a siren via a contact, notification to smartphone)
• quantity needs to have a name ("water")
• level needs to have a unit (l or l/m³)

Describe alternatives you've considered The light example is technically the same but with setting the on/off and level adjustments and not notifying these quanitities

[shubhamdp]

@MichaelHeiser why don't you subscribe to the desired attribute on your client/controller and take the required action.

[MichaelHeiser]

For clarification, I am really new to Matter and it would also be really nice if I will be pointed into the correct direction. Can you give me advice what you mean witd subscribing to the attribute. Is it comparable with an indication to a characteristic in BLE? Can I control the write rights to an attribute? Also a pointing to the correct doc section is welcome.

Thanks in advice :)

[shubhamdp]

Please find below few resources

• The ESP Journal blogs for high level understanding of Matter.
• Commissioning and Control section from ESP Matter Programming Guide has some details around subscription.
• And Matter specification can be found at CSA's official site

[shubhamdp]

@MichaelHeiser Do you have any update on this or if your question is answered please close the issue.

[MichaelHeiser]

Can you point me to a real code example, where the attributes are just read from a matter device?

[dhrishi]

Can you point me to a real code example, where the attributes are just read from a matter device?

Reads, when issued by a commissioner, are taken care of internally by the core Matter SDK. The code to read OnOff attribute: https://github.com/espressif/connectedhomeip/blob/699ff65e065a28e4b7ee3a2d84110444b1709040/src/app/clusters/on-off-server/on-off-server.cpp#L421

Reading directly on the device, in esp-matter, is done like this

[dhrishi]

Closing as the questions are answered