Configure a Subscription
Prerequisite You have created a new subscription as explained in ↗ Broker Details -> Create new subscription.
Overview
[A]
Topic preview
In this section, you see a preview of the incoming data
[A1]
Input for the topic preview
Enter an MQTT topic here. Its data appears in the preview. Important: In this field, you do NOT enter the topic to which you want to create a subscription – this is done in [C]
[B]
Name
Give the subscription a name. The subscription is displayed in the subscription list (in the broker details) under this name
[C]
Topic
Enter the MQTT topic here to which you want to create a subscription.
[D]
QoS (Quality of Service)
Select a value. The 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 incoming data. -> One or more formats
[G]
Select existing format
Alternatively 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 is used for all incoming data.
◈ If you select Multiple, you can differentiate the processing of the data – depending on the topic. This means: Within a subscription, different topics can be processed with different formats. For this, you use patterns to determine 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 Alevels/level2→ this data should be processed with Decoder B
Then in multiple mode, you enter two pairs:
levels/level1
Decoder A
levels/level2
Decoder B
▷ This way, the data is automatically decoded with the correct format depending on the topic.
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