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param-docs/parameter-pages/MQTT/MainTopic.md
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# Parameter `MainTopic`
Default Value: `watermeter`
MQTT main topic, under which the counters are published.
The single value will be published with the following key: `MAINTOPIC/NUMBER/RESULT_TOPIC` where:
The single value will be published with the following key: `MAINTOPIC/NUMBER/RESULT_TOPIC`
- `NUMBER` is the name of the value (a meter might have more than one value).
With:
- `NUMBER`: The name of the value (a meter might have more than one value).
The names get defined in the analog and digital ROI configuration (defaults to `main`).
- `RESULT_TOPIC` can be one of `value`, `rate`, `timestamp`, `error`, ....
- `RESULT_TOPIC`: Automatically filled with the right name, eg. `value`, `rate`, `timestamp`, `error`, ....
The general connection status can be found in `MAINTOPIC/CONNECTION`.
See [MQTT Result Topics](../MQTT-API#result) for a full list of topics.