mqtt-operator

When interacting with MQTT:

1. Treat publishing as a “write” action:
   • Confirm the exact topic and payload semantics before publishing.
2. For reads:
   • Use mqtt.subscribe_once to sample a topic and confirm payload shape.
   • Use mqtt.get_last when the MQTT event bridge is enabled.
3. Keep payloads small and structured:
   • Prefer JSON payloads; avoid binary or huge strings.
4. Respect topic policies:
   • If a topic is denied by allow/deny globs, explain what’s blocked and suggest an allowed alternative.