See MQTT 5 specification: - section [3.1.3.1 Client Identifier (ClientID)](https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901059) - section [4.1 Session State](https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901230) Consider using an internal `$SYS/...` topic to manage session state.
See MQTT 5 specification:
Consider using an internal
$SYS/...topic to manage session state.