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Northbound Interfaces
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MQTT Publisher
The MQTT publisher provides a northbound data interface for MQTT clients to data point values within the WinCC OA project.
Configuration of the MQTT Publisher
Default / Last Will
Common settings for the MQTT messages as well as Last Will settings.

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- MQTT Publisher
  The MQTT publisher provides a northbound data interface for MQTT clients to data point values within the WinCC OA project.
  - Requirements and Installation
  - Configuration of the MQTT Publisher
    - Connection
      General connection parameters like host and port number. Depending on the configuration a redundant connection can also be configured.
    - Advanced
      Advanced tab that allows to define advanced settings, like Root Topic, Intervals and Client ID.
    - Certificate
      Certificate tab that allows to define a client-side certificate that is be used for the communication with the MQTT broker.
    - Default / Last Will
      Common settings for the MQTT messages as well as Last Will settings.
    - State Details
      Details about the current state of the connection as well as general message statistics.
    - Commands
    - State
  - Data Access for the MQTT Publisher
  - Internal data points of the MQTT Publisher
  - Notes and Restrictions
  - [mqttpub]
    Settings for the MQTT Publisher.
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Default / Last Will

Common settings for the MQTT messages as well as Last Will settings.

Default

General settings used for the communication with the MQTT broker.

Transformation: The transformation that should be used for the transferred values. Following transformation types are available:
QoS: Quality of Service level for the published messages.
Retain: The checkbox defines if the transferred value should be retained in case of a connection loss.

Last Will

The Last Will settings allow to define a message, which should be published by the broker in the case the connection between publisher and broker is lost.

Topic: The topic which should be set for the Last Will message.
Message: The message text that should be contained within the Last Will message.
QoS: The QoS for the Last Will message. For more information on Quality of Service, see Quality of Service.
Retain: The checkbox defines if the transferred value should be retained in case of a connection loss.