signalIdentifier
The identifier for a signal that photodiodes and emitters produce.
Declaration
var signalIdentifier: Int { get }Discussion
To provide the same quality of service, certain system conditions may require that you configure the PPG sensor behavior differently while using the same photodiodes and emitters. Use this identifier to distinguish between the signals that the different configurations generate.
Samples with matching identifiers indicate that the sensor preserves the emitter-photodiode configuration during signal acquisition.