MqttUnsubscribe (FB)

FUNCTION_BLOCK MqttUnsubscribe EXTENDS AbbETrig3

unsusbscribe from a topic on an already established connection to an MQTT broker

InOut:

Scope	Name	Type	Initial	Comment	Inherited from
Input	Execute	BOOL	FALSE	A rising edge starts a single operation, the output Busy goes to TRUE. In the first cycle all other inputs are read and stored, afterwards they are ignored. A falling edge does not stop the operation. After Done = TRUE or Error = TRUE and Execute = FALSE all outputs will be reset. For executing another operation the Execute input needs to be retriggered by another rising edge!	AbbETrig3
Output	Done	BOOL	FALSE	Operation is completed without error (while outputs Busy and Error are FALSE). This output is TRUE for at least one cycle or until Execute is set to FALSE	AbbETrig3
	Busy	BOOL	FALSE	Operation is running (while outputs Done and Error are FALSE)	AbbETrig3
	Error	BOOL	FALSE	Operation is stopped with error (while outputs Busy and Done are FALSE). This output is TRUE for at least one cycle or until Execute is set to FALSE. The output ErrorID gives more details about the error.	AbbETrig3
Input	Conn	POINTER TO MQTT_CONNECTION	0	Pointer to valid connection struct created by MqttConnect.
	Topic	STRING(Constants.MQTT_MAX_TOPIC_LEN)	Defaults.MQTT_DEFAULT_EMPTY	Topic name as a string. See the description at the top. For further information see the MQTT specification.
Output	ErrorID	ERROR_ID	ERROR_ID.MQTT_ERR_NO_ERROR	Error code description