mqttSubN

Allows to subscribe to several topics.

Inputs

Inputs	Data Type	Description
IN	BOOL	Triggers the subscribe request (see notes).
CnxID	STRING	Identifier of the connection in the fieldbus configuration.
Topics[]	STRING	Message topics – may contain wild chars.
QOS	DINT	Wished quality of service.

Outputs

Outputs	Data Type	Description
OK	BOOL	TRUE if the request is successfully sent.
Error	BOOL	TRUE if the request failed.

Remarks

Empty strings in the topics array are ignored. You cannot pass more than 100 topics in the array.

The request is sent on a rising edge of the IN input. After that the outputs, either OK or Error, becomes TRUE.

On the falling edge of inputs both outputs are reset to FALSE .

Important

You can send only one request (subscribe, unsubscribe or publish) at a time.