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Information on the installed version of this object
MQTT Topic Examples
For the following example, eACM is collecting data from a device named “Device1”.
AUTOSOL MQTT has a GroupID of “LocalGroup” and NodeID of “FirstNode” (set on the SparkplugB tab).
What topics shoudl appear in the broker?
When the publisher first starts, there will be a node birth:
| Code Block |
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spBv1.0/LocalGroup/NBIRTH/FirstNode |
Followed by a birth message for our device(s). These will contain the initial values for all of the tags associated with each device:
| Code Block |
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spBv1.0/LocalGroup/DBIRTH/FirstNode/Device1 |
Finally, in the course of normal operation, there will be a series of data messages at a rate defined by the Publish Interval in the device object, assuming any tag’s value has changed within that interval:
| Code Block |
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spBv1.0/LocalGroup/DDATA/FirstNode/Device1 |
If communications are lost, or AUTOSOL MQTT is stopped, a node death message will arrive, signalling to all subscribers that the node is down:
| Code Block |
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spBv1.0/LocalGroup/NDEATH/FirstNode |
As SparkplugB is not a human readable format, a Sparkplug Decoder is needed to resolve the contents of these messages, such as the Sparkplug Decoder in MQTT.fx