Diagnostics & preflight

Related guidance: getting-started/preflight, how-to/troubleshooting.

Runnable examples: preflight.py.

Symbol	Summary
ConnectionStatus	Summarize the client’s lifecycle and MQTT connection state.
ClientState	Describe the client’s current lifecycle state.
ConnectionFailureCode	Classify one secret-safe connection or recovery failure.
ConnectionFailureOperation	Identify the bounded connection phase associated with a failure.
ConnectionRetryState	Describe whether and why the sole reconnect supervisor may run again.
DeliveryPhase	Record the strongest safe delivery fact established for one mutation.
PreflightReport	Collect the checks and readiness observed by one preflight run.
PreflightCheck	Report the outcome and duration of one MQTT preflight check.
PreflightCheckName	Identify the operation evaluated by a preflight check.
CheckStatus	Report the outcome of one preflight check.
SubscriptionProbe	Describe one caller-requested MQTT subscription authorization probe.
SubscriptionProbeKind	Identify the topic family for a subscription authorization probe.
PublicationReceipt	Confirm the strongest safe MQTT delivery fact for one publication.
PublicationKind	Identify the kind of locally completed publication.