Where Can I Find The ClientID?

The client ID is a unique per-client identifier that is provided by the connecting client. Each client will have a unique ID associated with it which is defined by the client during the initial connection.

This client identifier can be set arbitrarily, and unless otherwise configured somewhere in the deployment, serves only to uniquely identify the connected client. If left blank, oftentimes client libraries will automatically generate a unique client identifier on connection request.

More information on ClientID can be found under official MQTT documentation.

In case of any further issues, please contact HiveMQ Support.