[mosquitto-dev] Optional header mqtt message

[Philipp Halbritter <philipp.halbritter@xxxxxxxxxx>]

Hi,

 

currently I’m writing my master thesis about MQTT message tracing. I’ve read through the MQTTV3.1 standard and I’ve seen that it is possible to send a variable header in a MQTT message. My to that is: Does the mosquitto broker keep the variable message header so it will be delivered to all subscribers?

 

Think of following scenario:

• P1 publishs to topic /test, S1 gets all message from topic /test
• P1 adds a variable header with a traceId to all of his messages
• Is S1 getting these variable headers as well?

 

Sadly I couldn’t find anything concerning this question in the documentation.

 

Thanks for your thoughts.

 

Regards,

 

Philipp