How can I add color control capabilities to the matter_bulb example?

Question

"I added an endpoint called Matter Extended Color Light to the matter_bulb example. After compiling and flashing the firmware, HomeKit only recognizes and creates two dimmable lights without color control functionality. How can I configure the device to enable color control? Do I need to get the device certified by Apple to achieve this functionality?"

AHaug · Accepted Answer

We saw the same issues here at one point, but when saving the config, exiting ZAP GUI and opening again the parameters were no longer out of value. Looks like ZAP GUI might be misbehaving. 
 Could you try that and report back? 
 Kind regards, Andreas

AHaug · Answer

Hi, 
 You would also need to create the callback-function to do this. You can find a list over all functions in the files under modules/lib/matter/src/app/clusters/color-control-server/color-control-server.h. 
 What I'm a bit uncertain about is if you might be able to do things based on when the CurrentHue and CurrentSaturation attributes changes as we do with the On/Off in MatterPostAttributeChangeCallback(). 
 
 or if you have to have to make the callback function emberAfPluginColorControlServerHueSatTransitionEventHandler(), but I will look closer into this. 
 
 I would start with creating the callback for MatterPostAttributeChangeCallback(), and start with something as simple as the following and see if the function is called when you change Color Palette in HomeKit 
 void MatterPostAttributeChangeCallback(const chip::app::ConcreteAttributePath &attributePath, uint8_t type,
 uint16_t size, uint8_t *value)
{
	ClusterId clusterId = attributePath.mClusterId;
	AttributeId attributeId = attributePath.mAttributeId;

	if (clusterId == ColorControl::Id && attributeId == ColorControl::Attributes::CurrentHue::Id) {
 ChipLogProgress(Zcl, "Cluster ColorControl: attribute CurrentHue set to %" PRIu8 "", *value);
	} else if (clusterId == ColorControl::Id && attributeId == ColorControl::Attributes::CurrentSaturation::Id) {
 ChipLogProgress(Zcl, "Cluster ColorControl: attribute CurrentSaturation set to %" PRIu8 "", *value);
	}
} 
 Kind regards, Andreas

How can I add color control capabilities to the matter_bulb example?

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