MQTT_ReadTopicBinary (FUN)

FUNCTION MQTT_ReadTopicBinary : WORD

This function subscribes to the specified MQTT topic and returns published messages as arrays of bytes.

The output valid is set to TRUE when a publication occurs on the topic and the message payload is copied into value. Also the output variable value_size is set to the number of bytes copied.

InOut:

Scope	Name	Type	Comment
Return	MQTT_ReadTopicBinary	WORD	Status code returned by the runtime (0 means "no errors").
Inout	id	WORD	Operation identifier used by the runtime.
Input	topic	STRING(127)	MQTT topic name.
	qos	WORD	Quality of Service level.
Output	value	ARRAY [0..244] OF BYTE	Binary value received from the topic.
	value_size	WORD	Number of valid bytes in value.
	valid	BOOL	TRUE when a valid value has been received.