Implement authentication in MQTT (see https://mosquitto.org/documentation/dynamic-security/)
- Only if display auth is enabled
- A display's key/secret becomes its username/password
- Probably need a way to configure the admin user/password
- Script/cron to push all to the broker
- Do this via the entrypoint script
- Also push on change
- Auto enable/disable based on config?
Implement authentication in MQTT (see https://mosquitto.org/documentation/dynamic-security/)