https://devzone.nordicsemi.com/f/nordic-q-a/62012/zigbee-sdk-4-1-add-co2-and-hcho-clusterHi， In the 07-5123-07-zigbee-cluster-library-specification specification, I see clusters that support CO2 and HCHO, but I did not see any definitions of CO2 and HCHO (cluster) in the latest zigbee sdk 4.1. Our current Can the zigbee protocol stack supporten-USTelligent Community 13Mon, 01 Jun 2020 12:02:53 GMThttps://devzone.nordicsemi.com/thread/252573?ContentTypeID=1Mon, 01 Jun 2020 12:02:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e6ad08e4-4613-45c5-9304-9096907edd1ezero<p>The pressure cluster defines the cluster id on zb_zcl_common.h. Can I also add CO2 and HCHO cluster id in zb_zcl_common.h?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/252572?ContentTypeID=1Mon, 01 Jun 2020 11:43:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:385d89be-7004-46d3-847d-33345ec0948fPatrick<p>It is probably just a matter of implementing the clusters along the lines of the Pressure cluster that is included with the SDK. I think somewhere around SDK 3.1 or maybe 4.0, the pressure cluster was included as an example for how a custom cluster should be implemented, despite pressure being a standard cluster.</p><div style="clear:both;"></div>