Working with MQTT topics

Hi,   Is there a good documentation which describes well, how to work with mqtt topics?   When configuring the databus i am asked to create a topic. I have created a topic "test" with publish and subscribe permission.   Now I want to publish a tag / value combination via Flowcreator. Somehow I am confused by the adressing with ie/d/.... from WinCC Unified. What would be the correct adress of my created topic? Is it just "test"? At least this works within flowcreator.   But now I want to use this published Tag in IIH Semantics. I have entered the databus credentials, but I can only see the topic created by WinCC Unified. How can I get tags from my "Test" topic?      With best regards Stefan Schneiderbanger    
2 answers

The IIH essential expects the data in a dedicated format,the Industrial Edge Common Databus Payload Format. You can find more information about the expected format in the documentation.

To sum up, you require a custom connector with metadata topic, which describes your data and the process data itself. Basically the same topics, which are provided by the official connectors like e.g. the OPC UA Connector .


The following Github example describes the Common Dataload format:


Additionally you can also check out the following Github example:

You can find here an example how to create a custom connector using the Flow Creator. 

In this example the data will be provided to the OPC UA Server app, but it can be provided in the same way to the IIH Essentials.



0 I think you wont find any more than this on the mendix documentation.