Displays & HMI

CLUSTER_HEARTBEAT

What it is

Sends the heartbeat signal to ClusterOS.

int64[0]: epochTimeNs int64[1]: the visibility of ClusterUI, 0 - invisible, 1 - visible bytes: the app specific metadata, this can be empty when ClusterHomeService use the heartbeat to deliver the change of the visibility.

How the ID is built

A property ID is a 32-bit value packing four fields. Reading 0x11e00f4b apart:

Field	Mask	Value	Means
Group	0xf0000000	0x10000000	SYSTEM
Area	0x0f000000	0x01000000	GLOBAL
Type	0x00ff0000	0x00e00000	MIXED
Ordinal	0x0000ffff	0x00000f4b	0xf4b

Reading it from an app

CarPropertyManager mgr = (CarPropertyManager)
        car.getCarManager(Car.PROPERTY_SERVICE);

mgr.setProperty(Object.class,
        VehiclePropertyIds.CLUSTER_HEARTBEAT, 0, value);

This property is write-only — it cannot be read back. It fires a callback whenever the value changes.