AWSIoTSubscribeDeviceShadow (FB)¶

FUNCTION_BLOCK AWSIoTSubscribeDeviceShadow

Function block to subscribe for changes of the device shadow.

InOut:

Scope	Name	Type	Initial	Comment
Input	xEnable	BOOL		TRUE: Subscribes device shadow changes, FALSE: Unsubscribe
	pbPayload	POINTER TO BYTE		Pointer to the receive buffer (device shadow delta)
	udiMaxPayloadSize	UDINT		Maximum size of the receive buffer
	eQoS	QOS		Quality of service level (QoS)
	sClientId	REFERENCE TO STRING(255)	0	The name of another thing. The input sClientId can be used to access device shadows of other things. if 0, then the clientId from AWSIoTClient will be used.
Inout	awsIoTClient	AWSIoTClient		Reference to AWSIoTClient
Output	xError	BOOL		TRUE, if an error occurred
	xBusy	BOOL		TRUE, while is subscribed
	eError	MQTT.MQTT_ERROR		Error code
	xReceived	BOOL		TRUE, if the device shadow has been changed
	xSubscribeActive	BOOL	FALSE	FALSE: When there is no active subscription, TRUE: Subscriber is listening
	udiPayloadSize	UDINT		Length of the device shadow delta