Short summary

Name	`MQTT_GetState`
→POU type	→function
Category	more system blocks, MQTT
Graphical interface
Available since	version 1.32.0 (for logi.CAD 3) and version 2.3.1403 of the →runtime system (as replacement for the obsolete `MQTT_IsConnected` block) – initial variant version 1.108.0 (for logi.CAD 3) and version 3.18.0 of the →runtime system – enhancement: data type `MQTT_RC` for output `rc` (instead of `DINT`); data type `MQTT_SUBSCRIBER_STATE` for return value (instead of `SINT`) This block is supported for →Raspberry Pi.

Functionality

The block determines the connection state to a given →MQTT broker. The connection is specified by the connection handler.

The data is transferred by means of an already existing MQTT broker

	Identifier	→Data type	Description
Inputs:	`ch`	`DINT`	connection handler of interest (as obtained by the MQTT_Connect block)
Outputs:	`rc`	`MQTT_RC`	return code of involved MQTT functions as specified in data type `MQTT_RC`
Return value:	–	`MQTT_SUBSCRIBER_STATE`	returns the current state of the given connection handler as specified in data type `MQTT_SUBSCRIBER_STATE`

Input EN and output ENO are available when →calling the block. See "Execution control: EN, ENO" for information on input EN and output ENO.

See:

"Blocks for safe logic" whether this block is supported for developing safety-relevant applications.
"Highlighting safe logic in the FBD-editor" for the effects when using the block as a block for safe logic .

When creating your application within the ST-editor, enter a call of a block by typing the text as requested by the syntax or use Content Assist.