FastDDS key field in statistics topic

[Adjk-Luis]

I add some own custom statistics topics and configure it as fastdds builtin statistics topics, but i find that if the " m_isGetKeyDefined" is set to false, i will not receivce the topic samples in other app which subscriber to this topic, and if set true, it is ok. Then i try to do this test on fastdds builtin statistics topics, e.g. NETWORK_LATENCY_TOPIC, it behavies as the same. And later, i do the same test using a common example like app generated by fasddsgen, it is no probelm whether the m_isGetKeyDefined is true or false. why this happens?

[Mario-DL]

Hi @BlueBlueSkyHaha,

Could you please provide more insight in which statistic builtin topics are you testing and have m_isGetKeyDefined to false ?.
Also, ensure that you are using the recommended qos for statistics

[Adjk-Luis]

Thanks for responce. I tested NETWORK_LATENCY_TOPIC, it is a builtin statistics topic. If i just create a app to subscribe this topic and do nothing else, i can receive the statistics sample data, but if i modify "typesPubSubTypes.cxx" file as follow, then it did not works.

[Adjk-Luis]

sorry, it is not clear, what i modified is : m_isGetKeyDefined = true; -> m_isGetKeyDefined = false;

[Adjk-Luis]

it seems that statistics topics must set "m_isGetKeyDefined" to true, but other user topics can set or not, I do not know if this is the truth.