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AUTOSOL MQTT’s SparkplugB publisher has a GroupID of “LocalGroup” and NodeID of “FirstNode” (set on the Sparkplug B tab).
What topics should appear in the broker?
When the publisher first starts, there will be a node birth:
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Followed by a birth message for our the device(s). These will contain the initial values for all of the tags associated with each device:
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Finally, in the course of normal operation, there will be a series of data messages. These are published at a the rate defined by the Publish Interval in the device object, assuming if any tag’s value has changed within that interval:
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| Code Block |
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spBv1.0/LocalGroup/NDEATH/FirstNode |
| Info |
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As Sparkplug B is not a human readable format, a Sparkplug Decoder is needed to resolve the contents of these messages. |
Standard Publishers
For the following example, eACM is collecting data from a device named “Device1”, with the tag “Tag1”.
AUTOSOL MQTT’s Standard publisher has a NodeID of “LocalNode” (set on the MQTT tab).
What topics
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will appear in the broker?
When AUTOSOL MQTT starts up, tag data will appear with the topic:
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To write to a tag using the standard publisher you would simple have the payload be the value you want to write, in clear text, and you would publish to the topic below:, publish to the topic below with the value in clear text.
| Code Block |
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LocalNode/Device1/WRITE/Device1/Tag1 |