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The number of connected clients is available as an Ignition tag in the MQTT Distributor tag provider.

The tag path for this tag is [MQTT Distributor]Distributor Info/Connected Clients.


MQTT Engine Clients

MQTT Engine has two potential client connections.

One will publish the v3.0.0 Sparkplug™ B STATE message which will be initiated by default.

A second optional client is available to publish the legacy Sparkplug™ B STATE message and is disabled by default.

MQTT Transmission Clients

MQTT Transmission each unique combination of a Group and Edge Node ID is one MQTT client.

For example, the following Sparkplug Edge Nodes will result in 3 MQTT clients:

Group1/EdgeNode1
Group1/EdgeNode2
Group2/EdgeNode1

The MQTT Transmission Transmitters and Tag Trees document describes how Transmitters and Tag Trees can be arranged, which in turn will define how many MQTT clients get created from a single Transmission instance.

In addition, MQTT Transmission supports an optional RPC Client which is used when publishing from Ignition Python scripts. This is enabled by default.



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