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MQTT Engine has two potential client connections.

One, with ClientId in the format ME-xxxxxxx-xxxx-xxxx, will publish the v3.0.0 Sparkplug™ B STATE message which will be initiated by default.

A second optional client, with ClientId in the format ME-LS-xxxxxxxx-xxxx-xx, is available to publish the legacy Sparkplug™ B STATE message and is disabled by default.

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Each Sparkplug Edge Node Descriptor (which is a unique combination of the Group ID and Edge Node ID combination) will create one an MQTT client.

Transmission ClientIds are in the format MT-xxxxxxxx-xxxx-xxxx

For example, a single Transmitter configuration with the following Sparkplug Edge Node Descriptors will result in three Sparkplug MQTT clients:

Group1/EdgeNode1
Group1/EdgeNode2
Group2/EdgeNode1

A Transmission ClientId is in the format MT-xxxxxxxx-xxxx-xxxx

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.

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