System.enableFeature

System calls

// PROTOTYPE
int enableFeature(HAL_Feature feature)

// EXAMPLE
System.enableFeature(FEATURE_ETHERNET_DETECTION);

Enables a system feature. System feature that are read/write or write only are persistent and saved to configuration flash.

Feature	Read/Write	Description
FEATURE_RETAINED_MEMORY	Write Only	Preserve retained memory on backup power
FEATURE_WARM_START	Read Only	True if previous retained memory contents were available
FEATURE_CLOUD_UDP	Read Only	True if cloud connection is UDP and the alt keys in the DCT are used
FEATURE_RESET_INFO	Read/Write	Store last reset reason in retained memory
FEATURE_WIFI_POWERSAVE_CLOCK	Write Only	Enable Wi-Fi Powersave clock on TESTMODE/P1S6 pin on P1. Disabling it allows P1S6 to be used as GPIO.
FEATURE_ETHERNET_DETECTION	Read/Write	Enable detection of Ethernet FeatherWing at boot
FEATURE_LED_OVERRIDDEN	Read/Write	Override RGB LED signaling at boot
FEATURE_DISABLE_EXTERNAL_LOW_SPEED_CLOCK	Read/Write	If true, use internal low-speed clock instead of the external crystal clock
FEATURE_DISABLE_LISTENING_MODE	Read/Write	Disable listening mode

Use System.disableFeature() to disable a feature flag after enabling it (for read/write or write only flags)
Use System.featureEnabled() to get the current value of the feature flag (for read/write or read only flags)
Beware of features such as FEATURE_DISABLE_LISTENING_MODE. Enabling the feature disables listening mode, and disabling the feature enables listening mode