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The number of connected clients is available as an Ignition tag Details about MQTT Clients connected to MQTT Distributor can be found in the Distributor Info folder in the MQTT Distributor tag provider.
where:
Name | Data Type | Description |
|---|---|---|
| Connected Clients | Integer | The |
...
| number of the MQTT Clients currently connected | ||
| Keep Inactive Clients | Boolean | A writeable tag that controls whether to include inactive clients in Distributor Info tags (available 4.0.18 onward) |
| MQTT Clients | Dataset String Array String Array String Array Boolean Array DateTime Array DateTime Array | A dataset containing information about each connected client (available 4.0.18 onward). The following Column Names are included the dataset: ClientId Username IP Address Connected Last Connect Time Last Disconnect Time |
| Total Clients | Integer | The total number of clients that have connected since the last MQTT Distributor restart (available 4.0.18 onward) |
MQTT Engine Clients
MQTT Engine has two potential client connections.
One, with ClientId 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 ME-LS-xxxxxxxx-xxxx-xx, is available to publish the legacy Sparkplug™ B STATE message and is disabled by default.
MQTT Transmission Clients
Each Sparkplug Edge Node Descriptor (which is a unique combination of a Group ID and Edge Node ID is ) will create one MQTT client.
Transmission ClientIds are in the format MT-xxxxxxxx-xxxx-xxxx
For example, a single Transmitter configuration with the following Sparkplug Edge Nodes Node Descriptors will result in 3 three Sparkplug MQTT clients:
Group1/EdgeNode1
Group1/EdgeNode2
Group2/EdgeNode1
...
In addition, MQTT Transmission supports an optional RPC Client, ClientId MT-RPC-xxxxxxxx-xxxx-xxxx, which is used when publishing from Ignition Python scripts. This is enabled by default.
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