Can we read data from special topic like dropped or dead in hivemq. If yes then How we can read and will there be any consequences by doing this?

[hivemq-support]

Hi @Rahul,

HiveMQ Community Edition does not support the MQTT Topic Add-ons, which are part of HiveMQ Professional and Enterprise Edition.
In case you are using a licensed version of HiveMQ you can follow the linked documentation to enable the $dropped, $expired and $dead topic.

Kind regards,
Florian