Generic JSON Messages

The MQTT collector can be configured to parse generic JSON messages and extract measurements from them. The measurements are extracted using JSONPath expressions.

Measurement settings

The measurement settings reflect the configuration possibilities for mapping a JSON message. The values are extracted from the messages using JSONPath.
JSONPath documentation can be found here , jsonpath.com is a useful tool to test JSONPath expressions.

The path expressions can either yield a single value, or a list of values. The expressions for the timestamp(s), status(es), and tags and values have to either yield the same amount of results as the expression for the Measurement(s), or only a single value, in which case that single value will be used for all found measurements.

Topic

Description: The topic to listen to. When the topic is specified here, it will override the topic that was set in the collector.

Required: No

MeasurementPath

Description: The json path that leads to a value, or a list of values in the message

Required: Yes

TimestampPath

Description: The json path that leads to a timestamp, or a list of timestamps in the message

Required: No

StatusPath

Description: The json path that leads to a status, or a list of statuses in the message. If not set, status will default to ‘Good’

Required: No

TagNamesAndTagValuePaths

Description: Map describing tags, where keys are the tag names, and the values are the json paths of the tag values

Required: No

TimestampLayout

Description: The default layout of the timestamp of the measurements, if empty RFC3339 will be used, if timestamp are in UNIX format one of [‘UNIX’, ‘UNIXMILLIS’, ‘UNIXMICROS’, ‘UNIXNANOS’] can be used. More info: https://pkg.go.dev/time#Layout

Required: No