There was a 3-hour power outage at my internet supplier’s premises today.
Today, these devices do not have battery backup.
During the outage, it was a good opportunity to test, how ST Hub works during an outage.
The outage was during the day. I couldn’t test the sunset routines.
Remote controls and wall-mounted buttons controlled the lights and the light strips as normal.
Controls for the lights and the light strips are implemented using local Rules API rules.
MQTT communication ST Hub - MQTT Broker (RPi 4) - HomeAssistant (RPi 4) works during outage. From HA’s device history is possible to see that the temperature changes had been updated.
Other MQTT communication also worked during the outage.
HomeAssistant is my backup user interface. I use it about once a week when I go to take a backup of it.
Denver (Tuya) light strip control is not working. The light strip is a WiFi device and is connected via a cloud-to-cloud connection. Maybe it’s time to replace it with a Matter device.
Summary:
ST App is totally cloud based and nothing is operating.
The wall-mounted buttons controlled the lights during outage. This is a good solution for local controls. The outlets have push buttons to control devices during outages.
MQTT is a robust communication method. It recovers nicely from any disruptions (e.g. ST hub version updates).