mqttSubcribe

Subscribe to a message.

Inputs

Inputs	Data Type	Description
IN	BOOL	Triggers the subscribe request.
CnxID	STRING	Identifier of the connection in the fieldbus configuration.
Topic	STRING	Message topic – 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

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 or unsubscribe or publish) at a time.

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