Integration Into Existing Systems; Mqtt - W&T Web-IO Digital 4.0 Manual

Integration in bestehende Systeme

9. Integration into existing systems

The Web-IO supports some common standards and protocols and can be easily in-
tegrated into many installed systems.

MQTT

After enabling MQTT and configuring in the menu branch Communication paths »
MQTT the Web-IO supports two basic possibilities:
1. Passing the individual IO states and the counter value as an MQTT topic to an
MQTT broker via MQTT publish.
2. Switching the output depending on topic contents received via MQTT subscribe.
Both cases are handled in the Web-IO as an action. A detailed description of the ac-
tion philosophy used in the Web-IO can be found in the Actions section.
Publish IO states
To create a new MQTT publish, click the Add button under Actions. The input screen
for a new action will appear.
Here you can specify a name for the action and what the initiator should be.
For example you can specify an input as the initiator and ON as the trigger state.
Choose MQTT-Publish as the action. In the following menu, enter the path to which
the topic is to be written to the broker.
You can freely determine the contents of the topic, where the placeholders
described in the infotext can be used.
Switching outputs via subscribe
You must also add a new action in this case. Choose MQTT Subscribe as the
initiator.
Now enter the path via which the topic that contains the keyword for switching is
transferred. As an action, configure Switch Output » Switch this Web-IO Output. Then
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