Doubled Publication of MQTT Messages in different Formats with the same topic

[paulau]

Hallo,

We have a problem with our Installation of Frost. (It is the same installation as in my previous issue,
#2097 which was successfully closed).
It shold appear apparently in similar installations.

We submit the tasks for our Actuators, using mqtt:

mosquitto_pub -h localhost -p 1883 -u admin -P admin -t 'v1.1/TaskingCapabilities(1)/Tasks' -m '{"taskingParameters": {"target_temperature": 20}}' -i trtret

We expect, that clients do receive one message. Instead, they receive two messages:

v1.1/TaskingCapabilities(1)/Tasks {"taskingParameters": {"target_temperature": 20}}

v1.1/TaskingCapabilities(1)/Tasks {"@iot.selfLink":"http://localhost:8080/FROST-Server/v1.1/Tasks(18775)","@iot.id":18775,"creationTime":"2025-01-23T20:55:47.46Z","taskingParameters":{"target_temperature":20},"[email protected]":"http://localhost:8080/FROST-Server/v1.1/Tasks(18775)/TaskingCapability"}

Quite the same happens with MQTT Message to submit observations 'v1.1/Datastreams(1)/Observations'.
See points 3 and 4 of Issue #2097 . Clear identifiers should be changed to be different between subscriber and publisher.

It seems, that we should not really see the second message with the same topic. Schould the second message be for internal Frost needs and not to be published for external users/clients?

Thanks,
Greetings,
Pavel

[hylkevds]

Duplicate of #128 and opengeospatial/sensorthings#5
This is how MQTT works. In Version 2 we will fix this by using a separate create topic.