Configuring message filtering

The plugin makes use of different filters to filter messages.

Topic filtering

For topic filtering, the Filter_topic and Filter_topic_exact_match tags are used.

• Filter_topic

Regular expression or exact text that must match the message topic for the filter to be satisfied. This is optional. By default it would match any topic.

• Filter_topic_exact_match

Indicates whether what is specified in filter_topic will be treated as a regular expression (0) or as an exact text (1). It is optional. Default value is 0.

Examples

Using the Filter_topic and Filter_topic_exact_match filters we can choose the topic to subscribe to.

We can directly indicate the name of the topic or look for a regex pattern in it.

Suppose you have a MQTT topic called:

sensors/temperature/livingroom

EXAMPLE 1 filter_topic_exact_match 1 (Exact text)

You could configure filter_topic by specifying the topic name.

filter_topic sensors/temperature/livingroom

and set filter_topic_exact_match to 1, so that it searches only that topic.

filter_topic_exact_match 1

If instead of specifying the complete topic name, we specify only a part of the topic:

filter_topic sensors/temperature/

I would also agree.