Hello @bobthedeveloper ,
Thank you for reaching out!
If you happen to know the client IDs for these clients, you can always reconnect utilizing these IDs with a clean session request during connection - this will clear the previous clients from the broker, and allow them a fresh connection.
If you don’t happen to know the client IDs, there is not currently a way to query the broker for them. By default, these connections will be cleared at the end of the month.
Another user with similar questions had a previous thread, available here, which may provide some additional insight!
If more information regarding connected clients is required, please feel free to contact our team at cloud@hivemq.com.
Regards,
Aaron from HiveMQ Team