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Northbound Interfaces
Your portal to the cloud or supervising systems.
MQTT Publisher
The MQTT publisher provides a northbound data interface for MQTT clients to data point values within the WinCC OA project.
How-To
Prepare Amazon Web Service Broker Connection
A short description on establishing a connection to an AWS broker.

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Southbound Interfaces
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Northbound Interfaces
Your portal to the cloud or supervising systems.
- 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
  - Data Access for the MQTT Publisher
  - Internal data points of the MQTT Publisher
  - Notes and Restrictions
  - [mqttpub]
    Settings for the MQTT Publisher.
  - How-To
    - Add an additional broker connection
      The necessary configuration steps to add an additional broker to the project.
    - Prepare Amazon Web Service Broker Connection
      A short description on establishing a connection to an AWS broker.
- Node-RED
  Node-RED is a flow-based programming tool that allows the creation of applications in a graphic environment.
- OPC UA Server
  The WinCC OA OPC UA Server provides an OPC UA interface to access WinCC OA data point values, alarms and historical data.
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- OPC Alarms & Events
  OPC Alarms & Events (brief OPC A&E) is in addition to the Data Access another standard in order to implement a central alert management manufacturer spanning. OPC A&E is used to guarantee the coupling with other control systems as well as to display alerts and events in a hierarchical system
- Modbus/TCP Server
  The Modbus/TCP server provides the possibility for Modbus/TCP clients to query data from a WinCC OA system and arrange the data within a Modbus data model.
- SNMP
  SNMP (Simple Network Management Protocol) is a protocol for monitoring network devices (servers, workstations, routers, switches and hubs etc.) and their functions. It allows you to administer your network.
- OLE DB Provider
  OLE DB is a Microsoft specification for accessing data on different computers. It is based on Microsoft's COM technology and is the successor to the older and limited ODBC technology.
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Explore the capabilities of WinCC OA with our carefully selected collection of video tutorials and guides.
WinCC OA Documentation
Basic information about terms and functions within the documentation.
Disclaimer
A brief clarification of liability exclusions or legal notices.

Prepare Amazon Web Service Broker Connection

A short description on establishing a connection to an AWS broker.

This guide describes the necessary steps to configure and establish a connection between the MQTT Publisher and an () broker. The description assumes sufficient knowlegde on setting up your own AWS broker and the proper selection of the required web services.

Setup your AWS web service. An introductory tutorial can be found, e.g. here: https://www.youtube.com/watch?v=6w9a6y_-T2o
Download the necessary connection information for your web service from the AWS platform and place them in a (temporary) working directory.
Unzip the downloaded connect_device_package.zip containing the connection information.
```
unzip connection_device_package.zip
```
Set the proper permissions to run the downloaded files
```
Set-ExecutionPolicy -ExecutionPolicy Bypass -Scope Process
```
Note: In some cases it might help to run the command Get-ExecutionPolicy -List after setting the permissions.
Run the starting script start.ps1 to create and download all necessary certificates.
```
.\start.ps1
```
The files created during this step will then be used within WinCC OA.
Add the host name and port into your MQTT Publisher Connection configuration.

Note: The host name used within this step can either be received from AWS or from within the start.ps1 script.

Note: The default port for TLS is 8883.
Set the ClientID, provided by the AWS configuration, within the Advanced panel.
Add the previously created certificates within the Certificate configuration of the MQTT Publisher.

After following the steps described above the MQTT Publisher should be able to connect to your AWS broker.