Configure a subscription
Prerequisite You have created a new subscription, as explained in ↗ Broker details -> Create new subscription above.
Overview
[A]
Topic preview
In this section you see a preview of the incoming data
[A1]
Entering the topic preview
Enter an MQTT topic here. Its data will appear in the preview. Important: In this field, you enter NOT the topic for which you want to create a subscription – this is done in [C]
[B]
Name
Give the subscription a name. The subscription will be displayed under this name in the subscription list (in the broker details)
[C]
Topic
Enter the MQTT topic here for which you want to create a subscription.
[D]
QoS (Quality of Service)
Select a value. QoS indicates the level of message delivery between the MQTT broker and the connected clients
[E]
One or more formats
Choose whether a single format or multiple formats should be applied to the data. -> One or more formats
[G]
Select existing format
As an alternative to [F] you can also select an existing format
[H]
Save
Click to save the subscription
One or more formats
Choose whether a single format or multiple formats should be applied to the incoming data.
◈ If you select Single the same format will be used for all incoming data.
◈ If you select Multiple select, you can differentiate the data processing – depending on Topic. This means: Within a subscription, different topics can be processed with different formats. For this, use Patternto define which data belongs to which format.
Example:
You subscribe to the topic levels/+.
There are two actual topics:
levels/level1→ this data should be processed with Decoder A be processedlevels/level2→ this data should be processed with Decoder B be processed
Then in Multiple mode, enter two pairs:
levels/level1
Decoder A
levels/level2
Decoder B
▷ This way, the data is automatically decoded with the appropriate format depending on the topic.
Was this helpful?