MQTT Binding, multiple things sharing a topic

[rvalle (Rafael)]

Hi I am starting to use the tasmota RF bridge, unfortunately all received codes are sent via the same topic. The bridge itself cannot find out which codes come from the same thing, even thou it seems workable.

Is it possible to define multiple things that use the same topic, and perhaps they can “filter” which particular messages are for each thing?

[hafniumzinc (T)]

Yes, using the REGEX Transformation Service.

MQTT 2.5 M1+ How to implement the equivalent to MQTT1 REGEX filters

Problem In the MQTT1 binding there was a feature that let us filter messages published to a given topic and only pass those that match a given REGEX to the transformation and/or on to the Item. This was useful to handle devices that publish messages to a single well known topic for all their devices. For example, the official firmware from the vendor of Shelly devices have a request/response protocol over MQTT to get meta data about the devices (IP address, MAC address, firmware version, whethe…

Note that it is the Thing Channels which subscribe and publish to the topics.