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Every client that connects to the broker, for example for MQTT Engine or MQTT.fx is considered a connection and is included in this client count.

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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:

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