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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

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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.
  - How-To
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Configuration of the MQTT Publisher

The configuration panel of the MQTT Publisher can be found under: GEDI > System Management > Driver > MQTT Publisher

Figure 1. Configuration panel of the MQTT Publisher

Data Access Configuration

A description on how to define the published data can be found in the chapter Data Access for the MQTT Publisher.

MQTT Publisher Connection

You can select one of the existing connections via this combo box or create a new connection using the Create button.

The Remove button can be used to remove the currently selected connection.

Note: To use the MQTT Publisher a new WCCOAmqttpub manager must be added to your project.

Common settings

Establish connection: Defines if the connection to the broker shall be established when the connection is enabled.
JSON Profiles: Click this button to open the panel to edit the mapping of the available JSON profiles, see description of the JSON Profile Configuration Panel below.

JSON Profile Configuration Panel

JSON Profile

Following JSON profiles are available:

Value
Value & timestamp
Value, timestamp & status

WinCC OA Attribute

The WinCC OA attribute to which the JSON node shall be mapped.

JSON object node

Select the respective text field to edit the JSON object node + path (e.g. "Temperature.Value" or "Info.Timestamp") which is mapped to the respective WinCC OA attribute.

Configuration Tabs

Following tabs provide additional configuration options:


Tab	Description
Connection	Configuration of host, user credentials, etc.
Advanced	Advanced settings (Connection establishment, intervals,etc.)
Certificate	Certificate settings
Default / Last Will	Last will settings to define what the broker shall send to other clients if the driver loses connection.
State Details	Details regarding the connection status

Commands

Inverse GQ: Triggers an inverse general query which means that all exported DPEs data are published.

State

State Host 1 / State Host 2

Displays the connection state of host 1 / host 2. Following states are possible:

0 - Inactive
1 - Disconnected
2 - Connecting
3 - Connected
4 - Disconnecting
5 - Failure